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Atmospheric Chemistry and Physics
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Many thanks to Cristina Facchini and Rolf Sander and welcome to Barbara
Ervens as executive editor of ACP
First ACP Letter: The value of remote marine aerosol measurements for
constraining radiative forcing uncertainty
Atmospheric evolution of emissions from a boreal forest fire: the formation
of highly functionalized oxygen-, nitrogen-, and sulfur-containing organic
compounds
Observing the timescales of aerosol–cloud interactions in snapshot satellite
images
New ACP Letter: How alkaline compounds control atmospheric aerosol particle
acidity
Changes in biomass burning, wetland extent, or agriculture drive atmospheric
NH3 trends in select African regions
Two of ACP's founding executive editors step down
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The following lists the recent preprints posted on EGUsphere with ACP-related
topics, the recent preprints posted in ACP’s discussion forum, as well as final
revised papers published recently in ACP.
All papers Final revised papers only Preprints only
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28 Nov 2023
Undetected biogenic volatile organic compounds from Norway spruce drive total
ozone reactivity measurements
Steven Job Thomas, Toni Tykkä, Heidi Hellén, Federico Bianchi, and Arnaud P.
Praplan
Atmos. Chem. Phys., 23, 14627–14642,
https://doi.org/10.5194/acp-23-14627-2023,https://doi.org/10.5194/acp-23-14627-2023,
2023
Short summary
Short summary
The study employed total ozone reactivity to demonstrate how emissions of Norway
spruce readily react with ozone and could be a major ozone sink, particularly
under stress. Additionally, this approach provided insight into the limitations
of current analytical techniques that measure the compounds present or emitted
into the atmosphere. The study shows how the technique used was not enough to
measure all compounds emitted, and this could potentially underestimate various
atmospheric processes.
Hide
27 Nov 2023
Boundary of nighttime ozone chemical equilibrium in the mesopause region:
long-term evolution determined using 20-year satellite observations
Mikhail Yu. Kulikov, Mikhail V. Belikovich, Aleksey G. Chubarov, Svetlana O.
Dementyeva, and Alexander M. Feigin
Atmos. Chem. Phys., 23, 14593–14608,
https://doi.org/10.5194/acp-23-14593-2023,https://doi.org/10.5194/acp-23-14593-2023,
2023
Short summary
Short summary
In this work, the recently developed analytical criterion for determining the
boundary of nighttime ozone chemical equilibrium (NOCE) in the mesopause region
(80–90 km) is used (i) to study the connection of this boundary with O and H
spatiotemporal variability based on 3D modeling of chemical transport and (ii)
to retrieve and analyze the spatiotemporal evolution of the NOCE boundary in
2002–2021 from the SABER/TIMED data set.
Hide
27 Nov 2023
Trace elements in PM2.5 aerosols in East Asian outflow in the spring of 2018:
emission, transport, and source apportionment
Takuma Miyakawa, Akinori Ito, Chunmao Zhu, Atsushi Shimizu, Erika Matsumoto,
Yusuke Mizuno, and Yugo Kanaya
Atmos. Chem. Phys., 23, 14609–14626,
https://doi.org/10.5194/acp-23-14609-2023,https://doi.org/10.5194/acp-23-14609-2023,
2023
Short summary
Short summary
This study conducted semi-continuous measurements of PM2.5 aerosols and their
elemental composition in western Japan, during spring 2018. It analyzed the
emissions, transport, and wet removal of elements such as Pb, Cu, Fe, and Mn. It
also assessed the accuracy of modeled concentrations and found overestimations
of BC and underestimations of Cu and anthropogenic Fe in East Asia. Insights
into emissions, removals, and source apportionment of trace metals in the East
Asian outflow were provided.
Hide
27 Nov 2023
Observational study of factors influencing the dispersion of warm fog droplet
spectrum in Xishuangbanna, China
Zhenya An and Xiaoli Liu
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2516,https://doi.org/10.5194/egusphere-2023-2516,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
The study of warm fog helps to provide some theoretical support for cloud
microphysics observational studies and scientific understanding. In this study,
the microphysical characteristics of fog were explored using data sampled by the
instrument FM-120 and WPS-1000XP, and it was found that the relationship between
the microphysical quantities of fog is strongly influenced by the collision
process, and the size of the fog droplets in turn affects the collision process
between the droplets.
Hide
27 Nov 2023
Suppressed atmospheric chemical aging of cooking organic aerosol particles in
wintertime conditions
Wenli Liu, Longkun He, Yingjun Liu, Keren Liao, Qi Chen, and Mikinori Kuwata
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2657,https://doi.org/10.5194/egusphere-2023-2657,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Cooking is one of the major particle sources in urban areas. Previous laboratory
studies demonstrated the chemical lifetimes of cooking organic aerosols were
much shorter (~minutes) than the values reported by field observations (~hours).
We conducted laboratory experiments to resolve the discrepancy by considering
suppressed reactivity under low temperature. The parameterized k2-T
relationships and observed surface temperature data were used to estimate the
chemical lifetimes of COA particles.
Hide
27 Nov 2023
Aggravated surface O3 pollution primarily driven by meteorological variation in
China during the early COVID-19 pandemic lockdown period
Zhendong Lu, Jun Wang, Yi Wang, Daven K. Henze, Xi Chen, Tong Sha, and Kang Sun
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2723,https://doi.org/10.5194/egusphere-2023-2723,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
In contrast with the past work showing the reduction of emission as the dominant
factor for nation-wide increase of surface O3 during the lockdown in China, this
study finds that the variation in meteorology (temperature and other parameters)
plays a more important role. This result is obtained through sensitivity
simulations using a chemical transport model constrained by satellite (TROPOMI)
and calibrated with surface observation.
Hide
27 Nov 2023
A better representation of VOC chemistry in WRF-Chem and its impact on ozone
over Los Angeles
Qindan Zhu, Rebecca H. Schwantes, Matthew Coggon, Colin Harkins, Jordan Schnell,
Jian He, Havala O. T. Pye, Meng Li, Barry Baker, Zachary Moon, Ravan Ahmadov,
Eva Y. Pfannerstill, Bryan Place, Paul Wooldridge, Benjamin C. Schulze, Caleb
Arata, Anthony Bucholtz, John H. Seinfeld, Carsten Warneke, Chelsea E.
Stockwell, Lu Xu, Kristen Zuraski, Michael A. Robinson, Andy Neuman, Patrick R.
Veres, Jeff Peischl, Steven S. Brown, Allen H. Goldstein, Ronald C. Cohen, and
Brian C. McDonald
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2742,https://doi.org/10.5194/egusphere-2023-2742,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Volatile organic compounds (VOCs) fuel the production of air pollutants like
ozone and particulate matter. The representation of VOC chemistry remains
challenging due to its complexity in speciation and reactions. Here, we develop
a chemical mechanism, RACM2B-VCP, that better represent VOCs chemistry in urban
areas such as Los Angeles. We also discuss the contribution of VOCs emitted from
Volatile Chemical Products and other anthropogenic sources to total VOC
reactivity and O3.
Hide
24 Nov 2023
Measurement Report: Investigation on the sources and formation processes of
dicarboxylic acids and related species in urban aerosols before and during the
COVID-19 lockdown in Jinan, East China
Jingjing Meng, Yachen Wang, Yuanyuan Li, Tonglin Huang, Zhifei Wang, Yiqiu Wang,
Min Chen, Zhanfang Hou, Houhua Zhou, Keding Lu, Kimitaka Kawamura, and Pingqing
Fu
Atmos. Chem. Phys., 23, 14481–14503,
https://doi.org/10.5194/acp-23-14481-2023,https://doi.org/10.5194/acp-23-14481-2023,
2023
Short summary
Short summary
This study investigated the effect of COVID-19 lockdown (LCD) measures on the
formation and evolutionary process of diacids and related compounds from field
observations. Results demonstrate that more aged organic aerosols are observed
during the LCD due to the enhanced photochemical oxidation. Our study also found
that the reactivity of 13C was higher than that of 12C in the gaseous
photochemical oxidation, leading to higher δ13C values of C2 during the LCD than
before the LCD.
Hide
24 Nov 2023
Asymmetries in cloud microphysical properties ascribed to sea ice leads via
water vapour transport in the central Arctic
Pablo Saavedra Garfias, Heike Kalesse-Los, Luisa von Albedyll, Hannes Griesche,
and Gunnar Spreen
Atmos. Chem. Phys., 23, 14521–14546,
https://doi.org/10.5194/acp-23-14521-2023,https://doi.org/10.5194/acp-23-14521-2023,
2023
Short summary
Short summary
An important Arctic climate process is the release of heat fluxes from sea ice
openings to the atmosphere that influence the clouds. The characterization of
this process is the objective of this study. Using synergistic observations from
the MOSAiC expedition, we found that single-layer cloud properties show
significant differences when clouds are coupled or decoupled to the water vapour
transport which is used as physical link between the upwind sea ice openings and
the cloud under observation.
Hide
24 Nov 2023
Dynamics-based estimates of decline trend with fine temporal variations in
China's PM2.5 emissions
Zhen Peng, Lili Lei, Zhe-Min Tan, Meigen Zhang, Aijun Ding, and Xingxia Kou
Atmos. Chem. Phys., 23, 14505–14520,
https://doi.org/10.5194/acp-23-14505-2023,https://doi.org/10.5194/acp-23-14505-2023,
2023
Short summary
Short summary
Annual PM2.5 emissions in China consistently decreased by about 3% to 5% from
2017 to 2020 with spatial variations and seasonal dependencies.
High-temporal-resolution and dynamics-based PM2.5 emission estimates provide
quantitative diurnal variations for each season. Significant reductions in PM2.5
emissions in the North China Plain and northeast of China in 2020 were caused by
COVID-19.
Hide
24 Nov 2023
Bulk and molecular-level composition of primary organic aerosol from wood,
straw, cow dung, and plastic burning
Jun Zhang, Kun Li, Tiantian Wang, Erlend Gammelsæter, Rico K. Y. Cheung, Mihnea
Surdu, Sophie Bogler, Deepika Bhattu, Dongyu S. Wang, Tianqu Cui, Lu Qi, Houssni
Lamkaddam, Imad El Haddad, Jay G. Slowik, Andre S. H. Prevot, and David M. Bell
Atmos. Chem. Phys., 23, 14561–14576,
https://doi.org/10.5194/acp-23-14561-2023,https://doi.org/10.5194/acp-23-14561-2023,
2023
Short summary
Short summary
We conducted burning experiments to simulate various types of solid fuel
combustion, including residential burning, wildfires, agricultural burning, cow
dung, and plastic bag burning. The chemical composition of the particles was
characterized using mass spectrometers, and new potential markers for different
fuels were identified using statistical analysis. This work improves our
understanding of emissions from solid fuel burning and offers support for
refined source apportionment.
Hide
24 Nov 2023
Machine-learning-based investigation of the variables affecting summertime
lightning occurrence over the Southern Great Plains
Siyu Shan, Dale Allen, Zhanqing Li, Kenneth Pickering, and Jeff Lapierre
Atmos. Chem. Phys., 23, 14547–14560,
https://doi.org/10.5194/acp-23-14547-2023,https://doi.org/10.5194/acp-23-14547-2023,
2023
Short summary
Short summary
Several machine learning models are applied to identify important variables
affecting lightning occurrence in the vicinity of the Southern Great Plains ARM
site during the summer months of 2012–2020. We find that the random forest model
is the best predictor among common classifiers. We rank variables in terms of
their effectiveness in nowcasting ENTLN lightning and identify geometric cloud
thickness, rain rate and convective available potential energy (CAPE) as the
most effective predictors.
Hide
24 Nov 2023
Two years of satellite-based carbon dioxide emission quantification at the
world's largest coal-fired power plants
Daniel H. Cusworth, Andrew K. Thorpe, Charles E. Miller, Alana K. Ayasse, Ralph
Jiorle, Riley M. Duren, Ray Nassar, Jon-Paul Mastrogiacomo, and Robert R. Nelson
Atmos. Chem. Phys., 23, 14577–14591,
https://doi.org/10.5194/acp-23-14577-2023,https://doi.org/10.5194/acp-23-14577-2023,
2023
Short summary
Short summary
Carbon dioxide (CO2) emissions from combustion sources are uncertain in many
places across the globe. Satellites have the ability to detect and quantify
emissions from large CO2 point sources, including coal-fired power plants. In
this study, we tasked two satellites to routinely observe CO2 emissions at 30
coal-fired power plants between 2021 and 2022. These results present the largest
dataset of space-based CO2 emission estimates to date.
Hide
24 Nov 2023
Investigating the role of typhoon-induced gravity waves and stratospheric
hydration in the formation of tropopause cirrus clouds observed during the 2017
Asian monsoon
Amit Kumar Pandit, Jean-Paul Vernier, Thomas Duncan Fairlie, Kristopher M.
Bedka, Melody A. Avery, Harish Gadhavi, Madineni Venkat Ratnam, Sanjeev Dwivedi,
Kasimahanthi Amar Jyothi, Frank G. Wienhold, Holger Vömel, Hongyu Liu, Bo Zhang,
Buduru Suneel Kumar, Tra Dinh, and Achuthan Jayaraman
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2236,https://doi.org/10.5194/egusphere-2023-2236,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
This study investigates the formation mechanism of a tropopause cirrus cloud
layer observed at extremely cold temperatures over Hyderabad in India during the
2017 Asian summer monsoon using balloon-borne sensors. Ice crystals smaller than
50 microns were found in this optically thin cirrus cloud layer. Combined
analysis of back-trajectories, satellite, and model data revealed that the
formation of this layer was influenced by gravity waves and stratospheric
hydration induced by typhoon Hato.
Hide
24 Nov 2023
Measurement Report: Potential of MAX-DOAS and AERONET ground based measurements
in Montevideo, Uruguay for the detection of distant biomass burning
Matías Osorio, Alejandro Agesta, Tim Bösch, Nicolás Casaballe, Andreas Richter,
Leonardo Alvarado, and Erna Frins
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2390,https://doi.org/10.5194/egusphere-2023-2390,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
This study concerns the quantification of long-transport emissions of a biomass
burning event, which represents a major source of air pollutants, due to the
release of large amounts of aerosols and chemical species into the atmosphere.
The quantification was made using ground-based observations (which play an
important role in assessing the abundance of trace gases and aerosols) over
Montevideo (Uruguay) and with satellite observations.
Hide
23 Nov 2023
Investigating multiscale meteorological controls and impact of soil moisture
heterogeneity on radiation fog in complex terrain using semi-idealised
simulations
Dongqi Lin, Marwan Katurji, Laura E. Revell, Basit Khan, and Andrew Sturman
Atmos. Chem. Phys., 23, 14451–14479,
https://doi.org/10.5194/acp-23-14451-2023,https://doi.org/10.5194/acp-23-14451-2023,
2023
Short summary
Short summary
Accurate fog forecasting is difficult in a complex environment. Spatial
variations in soil moisture could impact fog. Here, we carried out fog
simulations with spatially different soil moisture in complex topography. The
soil moisture was calculated using satellite observations. The results show that
the spatial variations in soil moisture do not have a significant impact on
where fog occurs but do impact how long fog lasts. This finding could improve
fog forecasts in the future.
Hide
23 Nov 2023
Quantifying large methane emissions from the Nord Stream pipeline gas leak of
September 2022 using IASI satellite observations and inverse modelling
Chris Wilson, Brian J. Kerridge, Richard Siddans, David P. Moore, Lucy J.
Ventress, Emily Dowd, Wuhu Feng, Martyn P. Chipperfield, and John J. Remedios
EGUsphere,
https://doi.org/10.5194/egusphere-2023-1652,https://doi.org/10.5194/egusphere-2023-1652,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
The leaks from the Nord Stream gas pipelines in September 2022 released a large
amount of methane (CH4) to the atmosphere. We provide observational data from a
satellite instrument, IASI, that shows a large CH4 plume over the North Sea off
the coast of Scandinavia. We use this, together with atmospheric models, to
quantify the CH4 leaked into the atmosphere from the pipelines. We find that
215–390 Gg CH4 was emitted, making this the largest individual fossil
fuel-related CH4 leak on record.
Hide
23 Nov 2023
No severe ozone depletion in the tropical stratosphere in recent decades
Jayanarayanan Kuttippurath, Gopalakrishna Pillai Gopikrishnan, Rolf Müller,
Sophie Godin-Beekmann, and Jerome Brioude
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2574,https://doi.org/10.5194/egusphere-2023-2574,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
No measurements and no analyses show any sign of severe stratospheric ozone
depletion in the tropics in contrast to a recent claim. It is very unlikely that
an ozone hole would occur outside the Antarctic today with respect to the
current stratospheric halogen levels.
Hide
23 Nov 2023
Contribution of Cooking Emissions to the Urban Volatile Organic Compounds in Las
Vegas, NV
Matthew M. Coggon, Chelsea E. Stockwell, Lu Xu, Jeff Peischl, Jessica B. Gilman,
Aaron Lamplugh, Henry J. Bowman, Kenneth Aikin, Colin Harkins, Qindan Zhu,
Rebecca H. Schwantes, Jian He, Meng Li, Karl Seltzer, Brian McDonald, and
Carsten Warneke
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2749,https://doi.org/10.5194/egusphere-2023-2749,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Residential and commercial cooking emits pollutants that degrade air quality.
Here, ambient observations show that cooking is an important contributor to
anthropogenic volatile organic compounds (VOCs) emitted in Las Vegas, Nevada.
These emissions are poorly represented in air quality models and more work may
be needed to quantify emissions from important sources, such as commercial
restaurants.
Hide
23 Nov 2023
Observations of Tropical Tropopause Layer clouds from a balloon-borne lidar
Thomas Lesigne, Francois Ravetta, Aurélien Podglajen, Vincent Mariage, and
Jacques Pelon
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2763,https://doi.org/10.5194/egusphere-2023-2763,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Upper tropical clouds have a strong impact on Earth climate but are challenging
to observe. We report the first long-duration observations of tropical clouds
from lidars flying onboard stratospheric balloons. Comparisons with space-borne
observations reveal the unique sensitivity of balloon-borne lidar to optically
thin clouds. The thinnest ones have a significant coverage and lay in the
uppermost troposphere, they are linked with the dehydration of air masses on
their way to the stratosphere.
Hide
23 Nov 2023
Technical note: An assessment of the performance of statistical bias correction
techniques for global chemistry-climate model surface ozone fields
Christoph Staehle, Harald E. Rieder, and Arlene M. Fiore
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2743,https://doi.org/10.5194/egusphere-2023-2743,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Chemistry-climate models show biases compared to surface ozone observations, and
thus require bias-correction for impact studies and the assessment of air
quality changes. We compare the performance of commonly used correction
techniques for model outputs available via CMIP6. While all methods can reduce
model biases, better results are obtained for more complex approaches. Thus, our
study suggests broader use of these techniques in studies seeking to inform air
quality management and policy.
Hide
22 Nov 2023
pH dependence of brown-carbon optical properties in cloud water
Christopher J. Hennigan, Michael McKee, Vikram Pratap, Bryanna Boegner, Jasper
Reno, Lucia Garcia, Madison McLaren, and Sara M. Lance
Atmos. Chem. Phys., 23, 14437–14449,
https://doi.org/10.5194/acp-23-14437-2023,https://doi.org/10.5194/acp-23-14437-2023,
2023
Short summary
Short summary
This study characterized the optical properties of light-absorbing organic
compounds, called brown carbon (BrC), in atmospheric cloud water samples. In all
samples, light absorption by BrC increased linearly with increasing pH. There
was variability in the sensitivity of the absorption–pH relationship, depending
on the degree of influence from fire emissions. Overall, these results show that
the climate forcing of BrC is quite strongly affected by its pH-dependent
absorption.
Hide
22 Nov 2023
Quantification of fossil fuel CO2 from combined CO, δ13CO2 and Δ14CO2
observations
Jinsol Kim, John B. Miller, Charles E. Miller, Scott J. Lehman, Sylvia E.
Michel, Vineet Yadav, Nick E. Rollins, and William M. Berelson
Atmos. Chem. Phys., 23, 14425–14436,
https://doi.org/10.5194/acp-23-14425-2023,https://doi.org/10.5194/acp-23-14425-2023,
2023
Short summary
Short summary
In this study, we present the partitioning of CO2 signals from biogenic,
petroleum and natural gas sources by combining CO, 13CO2 and 14CO2 measurements.
Using measurements from flask air samples at three sites in the greater Los
Angeles region, we find larger and positive contributions of biogenic signals in
winter and smaller and negative contributions in summer. The largest
contribution of natural gas combustion generally occurs in summer.
Hide
22 Nov 2023
Vertical structure of a springtime smoky and humid troposphere over the
Southeast Atlantic from aircraft and reanalysis
Kristina Pistone, Eric M. Wilcox, Paquita Zuidema, Marco Giordano, James
Podolske, Samuel E. LeBlanc, Meloë Kacenelenbogen, Steven G. Howell, and Steffen
Freitag
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2412,https://doi.org/10.5194/egusphere-2023-2412,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
The springtime southeast Atlantic atmosphere contains lots of smoke from
continental fires. This smoke also contains water vapor; more smoke means more
humidity. We use aircraft observations and models to describe how these values
change through the season and over the region. We then sort the atmosphere into
different profile types, by vertical structure and amount of smoke and humidity.
Since they both absorb solar energy, our work helps to better quantify the
heating effects in this region.
Hide
22 Nov 2023
Evidence of an Ozone Mini-Hole Structure in the Early Hunga Tonga Plume Above
the Indian Ocean
Tristan Millet, Hassan Bencherif, Thierry Portafaix, Nelson Bègue, Alexandre
Baron, Valentin Duflot, Michaël Sicard, Jean-Marc Metzger, Guillaume Payen,
Nicolas Marquestaut, and Sophie Godin-Beekmann
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2645,https://doi.org/10.5194/egusphere-2023-2645,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
The eruption of the Hunga Tonga volcano in January 2022 released substantial
amounts of aerosols, sulfur dioxide, and water vapor into the stratosphere.
Satellite and ground instruments followed the displacement of the volcanic
aerosol plume and its impact on ozone levels over the Indian Ocean. Ozone data
reveal the presence of a persistent ozone mini-hole structure from 17 January to
22 January, with most ozone depletion occurring within the ozone layer at the
location of the aerosol plume.
Hide
22 Nov 2023
Simulating the seeder-feeder impacts on cloud ice and precipitation over the
Alps
Zane Dedekind, Ulrike Proske, Sylvaine Ferrachat, Ulrike Lohmann, and David
Neubauer
EGUsphere,
https://doi.org/10.5194/egusphere-2023-874,https://doi.org/10.5194/egusphere-2023-874,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Ice particles precipitating into lower clouds from an upper cloud, the
seeder-feeder process, can enhance precipitation. A numerical modeling study
conducted in the Swiss Alps found that 48 % of observed clouds were overlapping,
in which the seeder-feeder process occurred 10 % of these clouds. Inhibiting the
seeder-feeder process reduced the surface precipitation and ice particle growth
rates, which were further reduced when additional ice multiplication processes
were included in the model.
Hide
21 Nov 2023
Radical chemistry and ozone production at a UK coastal receptor site
Robert Woodward-Massey, Roberto Sommariva, Lisa K. Whalley, Danny R. Cryer,
Trevor Ingham, William J. Bloss, Stephen M. Ball, Sam Cox, James D. Lee, Chris
P. Reed, Leigh R. Crilley, Louisa J. Kramer, Brian J. Bandy, Grant L. Forster,
Claire E. Reeves, Paul S. Monks, and Dwayne E. Heard
Atmos. Chem. Phys., 23, 14393–14424,
https://doi.org/10.5194/acp-23-14393-2023,https://doi.org/10.5194/acp-23-14393-2023,
2023
Short summary
Short summary
Measurements of OH, HO2 and RO2 radicals and also OH reactivity were made at a
UK coastal site and compared to calculations from a constrained box model
utilising the Master Chemical Mechanism. The model agreement displayed a strong
dependence on the NO concentration. An experimental budget analysis for OH, HO2,
RO2 and total ROx demonstrated significant imbalances between HO2 and RO2
production rates. Ozone production rates were calculated from measured radicals
and compared to modelled values.
Hide
21 Nov 2023
The extratropical tropopause inversion layer and its correlation with relative
humidity
Daniel Köhler, Philipp Reutter, and Peter Spichtinger
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2440,https://doi.org/10.5194/egusphere-2023-2440,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
In this work, the influence of humidity on the properties of the tropopause is
studied. The tropopause is the interface between the troposphere and the
stratosphere and represents a barrier for the transport of air masses between
the troposphere and the stratosphere. We consider not only the tropopause
itself, but a layer around it called the tropopause inversion layer (TIL). It is
shown that the moister the underlying atmosphere, the stronger this layer acts
as a barrier.
Hide
21 Nov 2023
Decomposing the Effective Radiative Forcing of anthropogenic aerosols based on
CMIP6 Earth System Models
Alkiviadis Kalisoras, Aristeidis K. Georgoulias, Dimitris Akritidis, Robert J.
Allen, Vaishali Naik, Chaincy Kuo, Sophie Szopa, Pierre Nabat, Dirk Olivié, Twan
van Noije, Philippe Le Sager, David Neubauer, Naga Oshima, Jane Mulcahy, Larry
W. Horowitz, and Prodromos Zanis
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2571,https://doi.org/10.5194/egusphere-2023-2571,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Effective Radiative Forcing (ERF) is a metric for estimating how human
activities and natural agents change the energy flow into and out of the Earth’s
climate system. We investigate the anthropogenic aerosol ERF and we estimate the
contribution of individual processes to the total ERF using simulations from
Earth System Models within the Coupled Model Intercomparison Project Phase 6
(CMIP6). Our findings highlight that aerosol-cloud interactions drive ERF
variability during the last 150 years.
Hide
21 Nov 2023
Powering aircraft with 100% sustainable aviation fuel reduces ice crystals in
contrails
Raphael Satoru Märkl, Christiane Voigt, Daniel Sauer, Rebecca Katharina Dischl,
Stefan Kaufmann, Theresa Harlaß, Valerian Hahn, Anke Roiger, Cornelius
Weiß-Rehm, Ulrike Burkhardt, Ulrich Schumann, Andreas Marsing, Monika Scheibe,
Andreas Dörnbrack, Charles Renard, Maxime Gauthier, Peter Swann, Paul Madden,
Darren Luff, Reetu Sallinen, Tobias Schripp, and Patrick Le Clercq
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2638,https://doi.org/10.5194/egusphere-2023-2638,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
In situ measurements of contrails from a large passenger aircraft burning 100 %
sustainable aviation fuel (SAF) show a 56 % reduction in contrail ice crystal
numbers compared to conventional Jet A-1. Results from a climate model
initialized with the observations suggest a significant decrease in radiative
forcing from contrails. Our study confirms that a future increased use of low
aromatic SAF can reduce the climate impact from aviation.
Hide
21 Nov 2023
Formation and Loss of Light Absorbance by Phenolic Aqueous SOA by OH and an
Organic Triplet Excited State
Stephanie Arciva, Lan Ma, Camille Mavis, Chrystal Guzman, and Cort Anastasio
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2719,https://doi.org/10.5194/egusphere-2023-2719,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
We measured changes in light absorption during the aqueous oxidation of six
phenols with hydroxyl radical (●OH) or an organic triplet excited state (3C*).
All the phenols formed light-absorbing secondary brown carbon (BrC), which then
decayed with continued oxidation. Extrapolation to ambient conditions suggest
●OH is the dominant sink of secondary phenolic BrC in fog/cloud drops while 3C*
controls the lifetime of this light absorption in particle water.
Hide
20 Nov 2023
Understanding greenhouse gas (GHG) column concentrations in Munich using the
Weather Research and Forecasting (WRF) model
Xinxu Zhao, Jia Chen, Julia Marshall, Michal Gałkowski , Stephan Hachinger,
Florian Dietrich, Ankit Shekhar, Johannes Gensheimer, Adrian Wenzel, and
Christoph Gerbig
Atmos. Chem. Phys., 23, 14325–14347,
https://doi.org/10.5194/acp-23-14325-2023,https://doi.org/10.5194/acp-23-14325-2023,
2023
Short summary
Short summary
We develop a modeling framework using the Weather Research and Forecasting model
at a high spatial resolution (up to 400 m) to simulate atmospheric transport of
greenhouse gases and interpret column observations. Output is validated against
weather stations and column measurements in August 2018. The differential column
method is applied, aided by air-mass transport tracing with the Stochastic
Time-Inverted Lagrangian Transport (STILT) model, also for an exploratory
measurement interpretation.
Hide
20 Nov 2023
Sources and long-term variability of carbon monoxide at Mount Kenya and in
Nairobi
Leonard Kirago, Örjan Gustafsson, Samuel Mwaniki Gaita, Sophie L. Haslett,
Michael J. Gatari, Maria Elena Popa, Thomas Röckmann, Christoph Zellweger,
Martin Steinbacher, Jörg Klausen, Christian Félix, David Njiru, and August
Andersson
Atmos. Chem. Phys., 23, 14349–14357,
https://doi.org/10.5194/acp-23-14349-2023,https://doi.org/10.5194/acp-23-14349-2023,
2023
Short summary
Short summary
This study provides ground-observational evidence that supports earlier
suggestions that savanna fires are the main emitters and modulators of carbon
monoxide gas in Africa. Using isotope-based techniques, the study has shown that
about two-thirds of this gas is emitted from savanna fires, while for urban
areas, in this case Nairobi, primary sources approach 100 %. The latter has
implications for air quality policy, suggesting primary emissions such as
traffic should be targeted.
Hide
20 Nov 2023
Increased importance of aerosol–cloud interactions for surface PM2.5 pollution
relative to aerosol–radiation interactions in China with the anthropogenic
emission reductions
Da Gao, Bin Zhao, Shuxiao Wang, Yuan Wang, Brian Gaudet, Yun Zhu, Xiaochun Wang,
Jiewen Shen, Shengyue Li, Yicong He, Dejia Yin, and Zhaoxin Dong
Atmos. Chem. Phys., 23, 14359–14373,
https://doi.org/10.5194/acp-23-14359-2023,https://doi.org/10.5194/acp-23-14359-2023,
2023
Short summary
Short summary
Surface PM2.5 concentrations can be enhanced by aerosol–radiation interactions
(ARIs) and aerosol–cloud interactions (ACIs). In this study, we found PM2.5
enhancement induced by ACIs shows a significantly smaller decrease ratio than
that induced by ARIs in China with anthropogenic emission reduction from 2013 to
2021, making ACIs more important for enhancing PM2.5 concentrations. ACI-induced
PM2.5 enhancement needs to be emphatically considered to meet the national PM2.5
air quality standard.
Hide
20 Nov 2023
Climatology, sources, and transport characteristics of observed water vapor
extrema in the lower stratosphere
Emily N. Tinney and Cameron R. Homeyer
Atmos. Chem. Phys., 23, 14375–14392,
https://doi.org/10.5194/acp-23-14375-2023,https://doi.org/10.5194/acp-23-14375-2023,
2023
Short summary
Short summary
A long-term record of satellite observations is used to study extreme water
vapor concentrations in the lower stratosphere, which are important to climate
variability and change. We use a deeper layer of stratospheric observations than
prior work to more comprehensively identify these events. We show that extreme
water vapor concentrations are frequent, especially in the lowest layers of the
stratosphere that have not been analyzed previously.
Hide
20 Nov 2023
Volatile oxidation products and secondary organosiloxane aerosol from D5 + OH at
varying OH exposures
Hyun Gu Kang, Yanfang Chen, Yoojin Park, Thomas Berkemeier, and Hwajin Kim
Atmos. Chem. Phys., 23, 14307–14323,
https://doi.org/10.5194/acp-23-14307-2023,https://doi.org/10.5194/acp-23-14307-2023,
2023
Short summary
Short summary
D5 is an emerging anthropogenic pollutant that is ubiquitous in indoor and urban
environments, and the OH oxidation of D5 forms secondary organosiloxane aerosol
(SOSiA). Application of a kinetic box model that uses a volatility basis set
(VBS) showed that consideration of oxidative aging (aging-VBS) predicts SOSiA
formation much better than using a standard-VBS model. Ageing-dependent
parameterization is needed to accurately model SOSiA to assess the implications
of siloxanes for air quality.
Hide
20 Nov 2023
Quantifying the dependence of drop spectrum width on cloud drop number
concentration for cloud remote sensing
Matthew D. Lebsock and Mikael Witte
Atmos. Chem. Phys., 23, 14293–14305,
https://doi.org/10.5194/acp-23-14293-2023,https://doi.org/10.5194/acp-23-14293-2023,
2023
Short summary
Short summary
This paper evaluates measurements of cloud drop size distributions made from
airplanes. We find that as the number of cloud drops increases the distribution
of the cloud drop sizes narrows. The data are used to develop a simple equation
that relates the drop number to the width of the drop sizes. We then use this
equation to demonstrate that existing approaches to observe the drop number from
satellites contain errors that can be corrected by including the new
relationship.
Hide
20 Nov 2023
A WRF-Chem study on the variability of CO2, CH4 and CO concentrations at
Xianghe, China supported by ground-based observations and TROPOMI
Sieglinde Callewaert, Minqiang Zhou, Bavo Langerock, Pucai Wang, Ting Wang,
Emmanuel Mahieu, and Martine De Mazière
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2103,https://doi.org/10.5194/egusphere-2023-2103,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
We used an atmospheric transport model and satellite data to study greenhouse
gas observations at Xianghe, China. Our study shows the key source sectors that
influence the concentrations and their respective importance. Furthermore,
meteorological factors such as wind direction are discussed. This research
highlights the challenges in accurately simulating these kind of measurements
and helps us to better understand greenhouse gas variability in the region.
Hide
20 Nov 2023
Quantifying SO2 oxidation pathways to atmospheric sulfate by using stable sulfur
and oxygen isotopes: laboratory simulation and field observation
Ziyan Guo, Keding Lu, Pengxiang Qiu, Mingyi Xu, and Zhaobing Guo
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2554,https://doi.org/10.5194/egusphere-2023-2554,
2023
Preprint under review for ACP (discussion: open, 1 comment)
Short summary
Short summary
The formation of secondary sulfate in the atmosphere remains controversial, and
it is urgent to seek for a new method to quantify different sulfate formation
pathways. Due to their sensitivity for the reaction environment, Isotope
fractionation has widely used in trace of atmospheric processes. In this work,
the contributions of typical oxidation pathways of sulfate formation are
calculated on the basis of laboratory simulation and field observation via
sulfur and oxygen isotope fractionation.
Hide
20 Nov 2023
Aqueous-phase chemistry of glyoxal with multifunctional reduced nitrogen
compound: A potential missing route of secondary brown carbon
Yuemeng Ji, Zhang Shi, Wenjian Li, Jiaxin Wang, Qiuju Shi, Yixin Li, Lei Gao,
Ruize Ma, Weijun Lu, Lulu Xu, Yanpeng Gao, Guiying Li, and Taicheng An
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2662,https://doi.org/10.5194/egusphere-2023-2662,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
The formation mechanisms for secondary brown carbon (SBrC) contributed by
multifunctional RNCs remain unclear. Hence, from combined laboratory experiments
and quantum chemical calculation, we investigated the heterogeneous reactions of
glyoxal with multifunctional RNCs, which are driven by four-step indirect
nucleophilic addition reactions. Our results show a possible missing source for
SBrC formation on urban, regional, and global scales.
Hide
17 Nov 2023
An improved estimate of inorganic iodine emissions from the ocean using a
coupled surface microlayer box model
Ryan J. Pound, Lucy V. Brown, Mat J. Evans, and Lucy J. Carpenter
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2447,https://doi.org/10.5194/egusphere-2023-2447,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Iodine-mediated loss of ozone to the ocean surface and the subsequent emission
of iodine species has a large effect on the troposphere. Here we combine recent
experimental insights to develop a box model of the process, which we then
parameterise and incorporate into the GEOS-Chem transport model. We find that
these new insights have a small impact on the total emission of iodine but
significantly change its distribution.
Hide
17 Nov 2023
Crucial role of obliquely propagating gravity waves in the quasi-biennial
oscillation dynamics
Young-Ha Kim, Georg Sebastian Voelker, Gergely Bölöni, Günther Zängl, and Ulrich
Achatz
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2663,https://doi.org/10.5194/egusphere-2023-2663,
2023
Preprint under review for ACP (discussion: open, 1 comment)
Short summary
Short summary
The quasi-biennial oscillation, which governs the tropical stratospheric
circulation, is driven mainly by small-scale wave processes. We employ a novel
method to realistically represent the wave processes in a global model, thereby
revealing an aspect of the oscillation that could not be identified before. We
found that oblique propagation of waves, a process that existing climate models
cannot account for, plays a pivotal role in the stratospheric circulation and
its oscillation.
Hide
17 Nov 2023
Trends in Water Vapor in North America Based on GNSS observation and ERA5
reanalysis
Yuling Zhao, Ce Zhang, Shuaimin Wang, Yujing Xu, and Hong Yu
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2508,https://doi.org/10.5194/egusphere-2023-2508,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Water vapor is a very important meteorological factor for weather forecasting
and climate change monitoring. The study analyses the distribution and
interdecadal trends of PWV in North America based on GNSS observations and ERA5
reanalysis data. The results show that the PWV change from 1940 to 2022 shows an
obvious upward trend. In addition, the relationship between PWV and temperature
and the effect of ENSO on PWV are also analyzed.
Hide
16 Nov 2023
The evolution of deep convective systems and their associated cirrus outflows
George Horner and Edward Gryspeerdt
Atmos. Chem. Phys., 23, 14239–14253,
https://doi.org/10.5194/acp-23-14239-2023,https://doi.org/10.5194/acp-23-14239-2023,
2023
Short summary
Short summary
Tropical deep convective clouds, and the thin cirrus (ice) clouds that flow out
from them, are important for modulating the energy budget of the tropical
atmosphere. This work uses a new method to track the evolution of the properties
of these clouds across their entire lifetimes. We find these clouds cool the
atmosphere in the first 6 h before switching to a warming regime after the deep
convective core has dissipated, which is sustained beyond 120 h from the initial
convective event.
Hide
16 Nov 2023
Measurement report: Dust and anthropogenic aerosols' vertical distributions over
northern China dense aerosols gathered at the top of the mixing layer
Zhuang Wang, Chune Shi, Hao Zhang, Yujia Chen, Xiyuan Chi, Congzi Xia, Suyao
Wang, Yizhi Zhu, Kaidi Zhang, Xintong Chen, Chengzhi Xing, and Cheng Liu
Atmos. Chem. Phys., 23, 14271–14292,
https://doi.org/10.5194/acp-23-14271-2023,https://doi.org/10.5194/acp-23-14271-2023,
2023
Short summary
Short summary
The annual cycle of dust and anthropogenic aerosols' vertical distributions was
revealed by polarization Raman lidar in Beijing. Anthropogenic aerosols
typically accumulate at the top of the mixing layer (ML) due to the hygroscopic
growth of atmospheric particles, and this is most significant in summer. There
is no significant relationship between bottom dust mass concentration and ML
height, while the dust in the upper air tends to be distributed near the mixing
layer.
Hide
16 Nov 2023
Oxidative potential in rural, suburban and city centre atmospheric environments
in central Europe
Máté Vörösmarty, Gaëlle Uzu, Jean-Luc Jaffrezo, Pamela Dominutti, Zsófia
Kertész, Enikő Papp, and Imre Salma
Atmos. Chem. Phys., 23, 14255–14269,
https://doi.org/10.5194/acp-23-14255-2023,https://doi.org/10.5194/acp-23-14255-2023,
2023
Short summary
Short summary
Poor air quality caused by high concentrations of particulate matter is one of
the most severe public health concerns for humans worldwide. One of the most
important biological mechanisms inducing adverse health effects is the
oxidant–antioxidant imbalance. We showed that the oxidative stress changed
substantially and in a complex manner with location and season. Biomass burning
exhibited the dominant influence, while motor vehicles played an important role
in the non-heating period.
Hide
16 Nov 2023
The characteristics of cloud macro parameters caused by seeder-feeder inside
clouds measured by millimeter-wave cloud radar in Xi'an
Huige Di and Yun Yuan
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2183,https://doi.org/10.5194/egusphere-2023-2183,
2023
Preprint under review for ACP (discussion: open, 1 comment)
Short summary
Short summary
Based on the observation data of the ground-based Ka-band millimeter-wave cloud
radar (MMCR) and microwave radiometer in spring and autumn from 2020 to 2022,
the seeder-feeder phenomenon among double-layer clouds in China Xi'an was
studied. Through the analysis on the reflectivity factor and the radial velocity
of cloud particles detected by MMCR and on the retrieved cloud dynamics
parameters, it is shown that the reflectivity factor in the cloud are
significantly enhanced.
Hide
15 Nov 2023
Characterizing the tropospheric water vapor spatial variation and trend using
2007–2018 COSMIC radio occultation and ECMWF reanalysis data
Xi Shao, Shu-Peng Ho, Xin Jing, Xinjia Zhou, Yong Chen, Tung-Chang Liu, Bin
Zhang, and Jun Dong
Atmos. Chem. Phys., 23, 14187–14218,
https://doi.org/10.5194/acp-23-14187-2023,https://doi.org/10.5194/acp-23-14187-2023,
2023
Short summary
Short summary
Atmospheric water vapor plays an essential role in the global energy balance,
hydrological cycle, and climate system. This paper characterizes and compares
the global, latitudinal, and regional variabilities of COSMIC and ERA5 water
vapor distribution, as well as the seasonality and long-term trends at selected
pressure levels from 2007 to 2018. Evaluation of spatiotemporal variabilities of
atmospheric water vapor ensures the qualities of COSMIC and reanalysis water
vapor for climate studies.
Hide
15 Nov 2023
Assimilation of 3D polarimetric microphysical retrievals in a convective-scale
NWP system
Lucas Reimann, Clemens Simmer, and Silke Trömel
Atmos. Chem. Phys., 23, 14219–14237,
https://doi.org/10.5194/acp-23-14219-2023,https://doi.org/10.5194/acp-23-14219-2023,
2023
Short summary
Short summary
Polarimetric radar observations were assimilated for the first time in a
convective-scale numerical weather prediction system in Germany and their impact
on short-term precipitation forecasts was evaluated. The assimilation was
performed using microphysical retrievals of liquid and ice water content and
yielded slightly improved deterministic 9 h precipitation forecasts for three
intense summer precipitation cases with respect to the assimilation of radar
reflectivity alone.
Hide
14 Nov 2023
Impact of transport model resolution and a priori assumptions on inverse
modeling of Swiss F-gas emissions
Ioannis Katharopoulos, Dominique Rust, Martin K. Vollmer, Dominik Brunner,
Stefan Reimann, Simon J. O'Doherty, Dickon Young, Kieran M. Stanley, Tanja
Schuck, Jgor Arduini, Lukas Emmenegger, and Stephan Henne
Atmos. Chem. Phys., 23, 14159–14186,
https://doi.org/10.5194/acp-23-14159-2023,https://doi.org/10.5194/acp-23-14159-2023,
2023
Short summary
Short summary
The effectiveness of climate change mitigation needs to be scrutinized by
monitoring greenhouse gas (GHG) emissions. Countries report their emissions to
the UN in a bottom-up manner. By combining atmospheric observations and
transport models someone can independently validate emission estimates in a
top-down fashion. We report Swiss emissions of synthetic GHGs based on
kilometer-scale transport and inverse modeling, highlighting the role of
appropriate resolution in complex terrain.
Hide
14 Nov 2023
The atmospheric oxidizing capacity in China – Part 1: Roles of different
photochemical processes
Jianing Dai, Guy P. Brasseur, Mihalis Vrekoussis, Maria Kanakidou, Kun Qu,
Yijuan Zhang, Hongliang Zhang, and Tao Wang
Atmos. Chem. Phys., 23, 14127–14158,
https://doi.org/10.5194/acp-23-14127-2023,https://doi.org/10.5194/acp-23-14127-2023,
2023
Short summary
Short summary
In this study, we used a regional chemical transport model to characterize the
different parameters of atmospheric oxidative capacity in recent chemical
environments in China. These parameters include the production and destruction
rates of ozone and other oxidants, the ozone production efficiency, the OH
reactivity, and the length of the reaction chain responsible for the formation
of ozone and ROx. They are also affected by the aerosol burden in the
atmosphere.
Hide
14 Nov 2023
Wildfire smoke triggers cirrus formation: lidar observations over the eastern
Mediterranean
Rodanthi-Elisavet Mamouri, Albert Ansmann, Kevin Ohneiser, Daniel A. Knopf,
Argyro Nisantzi, Johannes Bühl, Ronny Engelmann, Annett Skupin, Patric Seifert,
Holger Baars, Dragos Ene, Ulla Wandinger, and Diofantos Hadjimitsis
Atmos. Chem. Phys., 23, 14097–14114,
https://doi.org/10.5194/acp-23-14097-2023,https://doi.org/10.5194/acp-23-14097-2023,
2023
Short summary
Short summary
For the first time, rather clear evidence is found that wildfire smoke particles
can trigger strong cirrus formation. This finding is of importance because
intensive and large wildfires may occur increasingly often in the future as
climate change proceeds. Based on lidar observations in Cyprus in autumn 2020,
we provide detailed insight into the cirrus formation at the tropopause in the
presence of aged wildfire smoke (here, 8–9 day old Californian wildfire smoke).
Hide
14 Nov 2023
Sensitivity of cloud-phase distribution to cloud microphysics and thermodynamics
in simulated deep convective clouds and SEVIRI retrievals
Cunbo Han, Corinna Hoose, Martin Stengel, Quentin Coopman, and Andrew Barrett
Atmos. Chem. Phys., 23, 14077–14095,
https://doi.org/10.5194/acp-23-14077-2023,https://doi.org/10.5194/acp-23-14077-2023,
2023
Short summary
Short summary
Cloud phase has been found to significantly impact cloud thermodynamics and
Earth’s radiation budget, and various factors influence it. This study
investigates the sensitivity of the cloud-phase distribution to the
ice-nucleating particle concentration and thermodynamics. Multiple simulation
experiments were performed using the ICON model at the convection-permitting
resolution of 1.2 km. Simulation results were compared to two different
retrieval products based on SEVIRI measurements.
Hide
14 Nov 2023
Atmospheric impact of 2-methylpentanal emissions: kinetics, photochemistry, and
formation of secondary pollutants
María Asensio, Sergio Blázquez, María Antiñolo, José Albaladejo, and Elena
Jiménez
Atmos. Chem. Phys., 23, 14115–14126,
https://doi.org/10.5194/acp-23-14115-2023,https://doi.org/10.5194/acp-23-14115-2023,
2023
Short summary
Short summary
In this work, we focus on the atmospheric chemistry and consequences for air
quality of 2-methylpentanal (2MP), which is widely used as a flavoring
ingredient and as an intermediate in the synthesis of dyes, resins, and
pharmaceuticals. Measurements are presented on how fast 2MP is degraded by
sunlight and oxidants like hydroxyl (OH) radicals and chlorine (Cl) atoms and
what products are generated. We conclude that 2MP will be degraded in a few
hours, affecting local air quality.
Hide
14 Nov 2023
Shipping and algae emissions have a major impact on ambient air mixing ratios of
NMHCs and methanethiol on Utö island in the Baltic Sea
Heidi Hellén, Rostislav Kouznetsov, Kaisa Kraft, Jukka Seppälä, Mika Vestenius,
Jukka-Pekka Jalkanen, Lauri Laakso, and Hannele Hakola
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2323,https://doi.org/10.5194/egusphere-2023-2323,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Mixing ratios of C2-C5 NMHCs and methanethiol were measured on an island in
Baltic Sea using an in-situ gas chromatograph. Shipping emissions were found to
be an important source of ethene, ethyne, propene and benzene. High summertime
mixing ratios of methanethiol and dependence of mixing ratios on sea water
temperature and height indicated the biogenic origin possibly from phytoplankton
or macroalgae. These emissions may have strong impacts on SO2 production and new
particle formation.
Hide
14 Nov 2023
Modeling atmospheric brown carbon in the GISS ModelE Earth system model
Maegan A. DeLessio, Kostas Tsigaridis, Susanne E. Bauer, Jacek Chowdhary, and
Gregory L. Schuster
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2472,https://doi.org/10.5194/egusphere-2023-2472,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
This study presents the first explicit representation of brown carbon aerosols
in the GISS ModelE Earth system model (ESM). Model sensitivity to a range of
brown carbon parameters, as well as model performance compared to AERONET and
MODIS retrievals of total aerosol properties, was assessed. General
recommendations for incorporating brown carbon into ESMs are also included.
Hide
14 Nov 2023
Parametric Sensitivity and Constraint of Contrail Cirrus Radiative Forcing in
the Atmospheric Component of CNRM-CM6-1
Maxime Perini, Laurent Terray, Daniel Cariolle, Saloua Peatier, and Marie-Pierre
Moine
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2478,https://doi.org/10.5194/egusphere-2023-2478,
2023
Preprint under review for ACP (discussion: open, 1 comment)
Short summary
Short summary
Uncertainty about aviation radiative forcing is essentially due to uncertainties
about non-CO2 forcing, especially for condensation trails (contrails). This
study uses a new parameterization for ice-supersaturation and additional
contrail coverage in the CNRM-CM6-1 atmospheric component to estimate contrail
radiative forcing for the year 2000. The range of contrail radiative forcing due
to parametric uncertainty is analyzed. Our contrail radiative forcing best
estimate is 56 (38−70) mW.m-2.
Hide
14 Nov 2023
Interactions between trade-wind clouds and local forcings over the Great Barrier
Reef: A case study using convection-permitting simulations
Wenhui Zhao, Yi Huang, Steven Thomas Siems, Michael James Manton, and Daniel
Patrick Harrison
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2633,https://doi.org/10.5194/egusphere-2023-2633,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
We studied how shallow clouds and rain behave over the Great Barrier Reef (GBR)
using a detailed weather model. We found that the shape of the land, especially
mountains, and particles in the air play big roles in influencing these clouds.
Surprisingly, the sea's temperature had a smaller effect. Our research helps us
understand the GBR's climate and how various factors can influence it, where the
importance of the local cloud in thermal coral bleaching has recently been
identified.
Hide
14 Nov 2023
Distinctive aerosol-cloud-precipitation interactions in marine boundary layer
clouds from the ACE-ENA and SOCRATES aircraft field campaigns
Xiaojian Zheng, Xiquan Dong, Baike Xi, Timothy Logan, and Yuan Wang
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2608,https://doi.org/10.5194/egusphere-2023-2608,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
The marine boundary layer aerosol-cloud interactions (ACI) are examined using
in-situ measurements from two aircraft campaigns over the eastern North Atlantic
(ACE-ENA) and Southern Ocean (SOCRATES). The SOCRATES clouds have more and
smaller cloud droplets. The ACE-ENA clouds exhibit pronounced drizzle formation
and growth. Results found distinctive aerosol-cloud interactions for two
campaigns. The drizzle processes significantly alter sub-cloud aerosol budgets,
and impact the ACI assessments.
Hide
13 Nov 2023
The role of temporal scales in extracting dominant meteorological drivers of
major airborne pollutants
Miaoqing Xu, Jing Yang, Manchun Li, Xiao Chen, Qiancheng Lv, Qi Yao, Bingbo Gao,
and Ziyue Chen
Atmos. Chem. Phys., 23, 14065–14076,
https://doi.org/10.5194/acp-23-14065-2023,https://doi.org/10.5194/acp-23-14065-2023,
2023
Short summary
Short summary
Although the temporal-scale effects on PM2.5–meteorology associations have been
discussed, no quantitative evidence has proved this before. Based on rare 3 h
meteorology data, we revealed that the dominant meteorological factor for PM2.5
concentrations across China extracted at the 3 h and 24 h scales presented large
variations. This research suggests that data sources of different temporal
scales should be comprehensively considered for better attribution and
prevention of airborne pollution.
Hide
13 Nov 2023
Investigation of the climatology of low-level jets over North America in a
high-resolution WRF simulation
Xiao Ma, Yanping Li, Zhenhua Li, and Fei Huo
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2342,https://doi.org/10.5194/egusphere-2023-2342,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
This research studies the climatological attributes of low-level jets (LLJs)
across North America using a 4km simulation. The study identifies significant
LLJ systems such as the Great Plains LLJs. It also provides insights into less
adequately represented LLJ systems by coarser models, such as the Quebec
Northerly LLJ and small-scale low-level wind maxima around the Rocky Mountains.
Additionally, the study investigates three distinct LLJs' diverse physical
mechanisms driving their formation.
Hide
13 Nov 2023
Comparison of water-soluble and insoluble organic compositions attributing to
different light absorption efficiency between residential coal and biomass
burning emissions
Lu Zhang, Jin Li, Yaojie Li, Xinlei Liu, Zhihan Luo, Guofeng Shen, and Shu Tao
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2417,https://doi.org/10.5194/egusphere-2023-2417,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Brown Carbon (BrC) is related to radiative forcing and climate change. The BrC
fraction from residential coal and biomass burning emissions which was the major
source of BrC were characterized at the molecular level. The CHOS aromatic
compounds explained higher light absorption efficiencies of biomass burning
emissions compared to coals. The unique formulas of coal combustion aerosols
were characterized by higher unsaturated compounds, such information could be
used for source appointment.
Hide
13 Nov 2023
Diverse mixing state and ice nucleation properties of aerosol particles over the
Western Pacific and the Southern Ocean
Jiao Xue, Tian Zhang, Keyhong Park, Jinpei Yan, Young Jun Yoon, Jiyeon Park, and
Bingbing Wang
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2646,https://doi.org/10.5194/egusphere-2023-2646,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Ice formation by aerosol particles is an important way of making mixed-phase and
ice clouds. Here, we showed that particles collected in the marine atmosphere
with different composition and mixing state show a variety of ice nucleation
abilities. Characterization of ice nucleating particles indicates that aging
process may impact on their abilities to form ice. Comprehensive
characterizations of particles and their mixing state are needed for better
understanding in aerosol-cloud interactions.
Hide
13 Nov 2023
Negligible Temperature Dependence of the Ozone-Iodide Reaction and Implications
for Oceanic Emissions of Iodine
Lucy V. Brown, Ryan J. Pound, Lyndsay S. Ives, Matthew R. Jones, Stephen J.
Andrews, and Lucy J. Carpenter
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2660,https://doi.org/10.5194/egusphere-2023-2660,
2023
Preprint under review for ACP (discussion: open, 1 comment)
Short summary
Short summary
Ozone is deposited from the lower atmosphere to the surface of the ocean,
however the chemical reactions which drive this deposition are not currently
well understood. Of particular importance is the reaction between ozone and
iodide, and this work measured the kinetics of this reaction, as well as its
temperature dependence, which we found to be negligible. We then investigated
the subsequent emissions of iodine-containing species from the surface ocean,
which can further impact ozone.
Hide
10 Nov 2023
Tropical tropospheric ozone and carbon monoxide distributions: characteristics,
origins, and control factors, as seen by IAGOS and IASI
Maria Tsivlidou, Bastien Sauvage, Yasmine Bennouna, Romain Blot, Damien
Boulanger, Hannah Clark, Eric Le Flochmoën, Philippe Nédélec, Valérie Thouret,
Pawel Wolff, and Brice Barret
Atmos. Chem. Phys., 23, 14039–14063,
https://doi.org/10.5194/acp-23-14039-2023,https://doi.org/10.5194/acp-23-14039-2023,
2023
Short summary
Short summary
The tropics are a region where the ozone increase has been most apparent since
1980 and where observations are sparse. Using aircraft, satellite, and model
data, we document the characteristics of tropospheric ozone and CO over the
whole tropics for the last 2 decades. We explore the origin of the observed CO
anomalies and investigate transport processes driving the tropical CO and O3
distribution. Our study highlights the importance of anthropogenic emissions,
mostly over the northern tropics.
Hide
10 Nov 2023
Technical note: Characterization of a single-beam gradient force aerosol optical
tweezer for droplet trapping, phase transitions monitoring, and morphology
studies
Xiangyu Pei, Yikan Meng, Yueling Chen, Huichao Liu, Yao Song, Zhengning Xu, Fei
Zhang, Thomas C. Preston, and Zhibin Wang
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2238,https://doi.org/10.5194/egusphere-2023-2238,
2023
Preprint under review for ACP (discussion: open, 1 comment)
Short summary
Short summary
An aerosol optical tweezer (AOT)-Raman spectroscopy system is developed to
capture single aerosol droplet for phase transitions monitoring and morphology
studies. Rapid droplet capture is achieved and accurate droplet size and
refractive index are retrieved. Results indicate that inorganic/organic mixed
droplets are more inclined to form core-shell morphology when RH decreases. The
phase transitions of secondary organic aerosol/inorganic mixed droplets vary
with their precursors.
Hide
10 Nov 2023
Surface networks in the Arctic may miss a future "methane bomb"
Sophie Wittig, Antoine Berchet, Isabelle Pison, Marielle Saunois, and
Jean-Daniel Paris
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2308,https://doi.org/10.5194/egusphere-2023-2308,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
The aim of this work is to analyse how accurately a "methane bomb" event could
be detected with the current and a hypothetically extended, stationary
observation network in the Arctic. Therefore, we incorporate synthetically
modelled possible future CH4 concentrations based on plausible emission
scenarios into an inverse modelling framework. We analyse how well the increase
is detected in different Arctic regions and evaluate the impact of additional
observation sites in this respect.
Hide
10 Nov 2023
Improving the predictions of black carbon (BC) optical properties at various
aging stages using a machine-learning-based approach
Baseerat Romshoo, Jaikrishna Patil, Tobias Michels, Thomas Müller, Marius Kloft,
and Mira Pöhlker
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2400,https://doi.org/10.5194/egusphere-2023-2400,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
It is demonstrated that the predictions of optical properties like single
scattering albedo (ω) and mass absorption cross-section (MAC) can be improved
compared to the conventional Mie-based predictions using highly accurate and
fast benchmark machine learning methods. Our findings assist the global modeling
community in considering realistic BC morphologies depending on the aging stage
so that uncertainties can be reduced in climate predictions.
Hide
09 Nov 2023
Sensitivity of cirrus and contrail radiative effect on cloud microphysical and
environmental parameters
Kevin Wolf, Nicolas Bellouin, and Olivier Boucher
Atmos. Chem. Phys., 23, 14003–14037,
https://doi.org/10.5194/acp-23-14003-2023,https://doi.org/10.5194/acp-23-14003-2023,
2023
Short summary
Short summary
Cirrus and contrails considerably impact Earth's energy budget. Such ice clouds
can have a positive (warming) or negative (cooling) net radiative effect (RE),
which depends on cloud and ambient properties. The effect of eight parameters on
the cloud RE is estimated. In total, 283 500 radiative transfer simulations have
been performed, spanning the typical parameter ranges associated with cirrus and
contrails. Specific cases are selected and discussed. The data set is publicly
available.
Hide
09 Nov 2023
Analysis of insoluble particles in hailstones in China
Haifan Zhang, Xiangyu Lin, Qinghong Zhang, Kai Bi, Chan-Pang Ng, Yangze Ren,
Huiwen Xue, Li Chen, and Zhuolin Chang
Atmos. Chem. Phys., 23, 13957–13971,
https://doi.org/10.5194/acp-23-13957-2023,https://doi.org/10.5194/acp-23-13957-2023,
2023
Short summary
Short summary
This work is the first study to simultaneously analyze the number concentrations
and species of insoluble particles in hailstones. The size distribution of
insoluble particles for each species vary greatly in different hailstorms but
little in shells. Two classic size distribution modes of organics and dust were
fitted for the description of insoluble particles in deep convection. Combining
this study with future experiments will lead to refinement of weather and
climate models.
Hide
09 Nov 2023
Evaluating F2-region long-term trends using the International Reference
Ionosphere (IRI) model: is this a feasible approximation for experimental
trends?
Bruno S. Zossi, Trinidad Duran, Franco D. Medina, Blas F. de Haro Barbas, Yamila
Melendi, and Ana G. Elias
Atmos. Chem. Phys., 23, 13973–13986,
https://doi.org/10.5194/acp-23-13973-2023,https://doi.org/10.5194/acp-23-13973-2023,
2023
Short summary
Short summary
The International Reference Ionosphere (IRI) is a widely used ionospheric
empirical model based on observations from a worldwide network of ionospheric
stations. It is reasonable, then, to expect that it captures long-term changes
in ionospheric parameters linked to trend forcings like greenhouse gases
increasing concentration and the Earth's magnetic field secular variation. We
show that the IRI model can be a valuable tool for obtaining preliminary
approximations of experimental trends.
Hide
09 Nov 2023
Effect of the boundary layer low-level jet on fast fog spatial propagation
Shuqi Yan, Hongbin Wang, Xiaohui Liu, Fan Zu, and Duanyang Liu
Atmos. Chem. Phys., 23, 13987–14002,
https://doi.org/10.5194/acp-23-13987-2023,https://doi.org/10.5194/acp-23-13987-2023,
2023
Short summary
Short summary
In this study, we quantitatively study the effect of the boundary layer
low-level jet (BLLJ) on fast fog spatial propagation; i.e., the fog area expands
very fast along a certain direction. The wind speed (10 m s−1) and direction
(southeast) of the BLLJ core are consistent with fog propagation (9.6 m s−1).
The BLLJ-induced temperature and moisture advections are possible reasons for
fast fog propagation. The propagation speed would decrease by 6.4 m s−1 if these
advections were turned off.
Hide
09 Nov 2023
Bacteria in clouds biodegrade atmospheric formic and acetic acids
Leslie Nuñez López, Pierre Amato, and Barbara Ervens
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2270,https://doi.org/10.5194/egusphere-2023-2270,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Living bacteria comprise a small particle fraction in the atmosphere. Our model
study shows that atmospheric bacteria in clouds may efficiently biodegrade
formic and acetic acids that affect acidity of rain. We conclude that current
atmospheric models underestimate losses of these acids as they only consider
chemical processes. We suggest that biodegradation can affect atmospheric
concentration not only of formic and acetic acids but also of other volatile,
moderately soluble organics.
Hide
09 Nov 2023
Prominent role of organics in aerosol liquid water content over the
south-eastern Atlantic during biomass burning season
Lu Zhang, Michal Segal-Rozenhaimer, Haochi Che, Caroline Dang, Junying Sun, Ye
Kuang, and Paola Formenti
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2319,https://doi.org/10.5194/egusphere-2023-2319,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Our study examined the interaction between atmospheric particles and moisture
over the south-eastern Atlantic Ocean during the biomass burning seasons in
Africa. We found that organic components of these particles play a more
important role in aerosol-moisture interactions than previously expected. This
discovery is important as such interactions impact radiation and climate.
Current climate models might need better representations of the
moisture-absorbing properties of organic aerosols.
Hide
09 Nov 2023
Correction of temperature and relative humidity biases in ERA5 by bivariate
quantile mapping: Implications for contrail classification
Kevin Wolf, Nicolas Bellouin, Olivier Boucher, Susanne Rohs, and Yun Li
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2356,https://doi.org/10.5194/egusphere-2023-2356,
2023
Preprint under review for ACP (discussion: open, 1 comment)
Short summary
Short summary
ERA5 atmospheric reanalysis and airborne in situ observations from IAGOS are
compared in terms of representation of the contrail occurrence potential and the
presence of supersaturation for persistency. Differences are traced back to
biases in ERA5 temperature and, particularly, relative humidity. Those biases
are addressed applying a new quantile mapping technique that marginally modifies
the contrail representation in ERA5. An overall good statistical contrail
representation in ERA5 is found.
Hide
09 Nov 2023
Evaluation of downward and upward solar irradiances simulated by the Integrated
Forecasting System of ECMWF using airborne observations above Arctic low-level
clouds
Hanno Müller, André Ehrlich, Evelyn Jäkel, Johannes Röttenbacher, Benjamin
Kirbus, Michael Schäfer, Robin J. Hogan, and Manfred Wendisch
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2443,https://doi.org/10.5194/egusphere-2023-2443,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
A weather model is used to compare solar radiation with measurements from an
aircraft campaign in the Arctic. Model and observations agree on the downward
radiation but show differences in the radiation reflected by the surface and the
clouds, which is in the model too low above sea ice and too high above open
ocean. The model-observation bias is reduced above open ocean by a realistic
fraction of clouds and less cloud liquid water and above sea ice by less dark
sea ice and more cloud droplets.
Hide
09 Nov 2023
Extreme ozone episodes in a major Mediterranean urban area
Jordi Massagué, Eduardo Torre-Pascual, Cristina Carnerero, Miguel Escudero,
Andrés Alastuey, Marco Pandolfi, Xavier Querol, and Gotzon Gangoiti
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2449,https://doi.org/10.5194/egusphere-2023-2449,
2023
Preprint under review for ACP (discussion: open, 1 comment)
Short summary
Short summary
This study analysed extreme ozone episodes in Barcelona, which have occurred
only in recent years and are of particular concern due to the city's significant
population. The research reveals that these episodes result from a complex
interplay of factors, including the effects of pollution transport from regional
to local sources and specific weather and emission patterns. These findings
advance the understanding of the mechanisms behind these episodes and strengthen
predictive capabilities.
Hide
09 Nov 2023
Sea salt reactivity over the northwest Atlantic: An in-depth look using the
airborne ACTIVATE dataset
Eva-Lou Edwards, Yonghoon Choi, Ewan C. Crosbie, Joshua P. DiGangi, Glenn S.
Diskin, Claire E. Robinson, Michael A. Shook, Edward L. Winstead, Luke D.
Ziemba, and Armin Sorooshian
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2575,https://doi.org/10.5194/egusphere-2023-2575,
2023
Preprint under review for ACP (discussion: open, 1 comment)
Short summary
Short summary
We investigate Cl- depletion in sea salt particles over the northwest Atlantic
from December 2021–June 2022 using an airborne dataset. Losses of Cl- are
greatest in May and least in December–February and March. Inorganic acidic
species can account for all depletion observed for December–February, March, and
June near Bermuda, yet none in May. Quantifying Cl- depletion as a percentage
captures seasonal trends in depletion but fails to convey the effects they may
have on atmospheric oxidation.
Hide
08 Nov 2023
Aerosol and dynamical contributions to cloud droplet formation in Arctic
low-level clouds
Ghislain Motos, Gabriel Freitas, Paraskevi Georgakaki, Jörg Wieder, Guangyu Li,
Wenche Aas, Chris Lunder, Radovan Krejci, Julie Thérèse Pasquier, Jan
Henneberger, Robert Oscar David, Christoph Ritter, Claudia Mohr, Paul Zieger,
and Athanasios Nenes
Atmos. Chem. Phys., 23, 13941–13956,
https://doi.org/10.5194/acp-23-13941-2023,https://doi.org/10.5194/acp-23-13941-2023,
2023
Short summary
Short summary
Low-altitude clouds play a key role in regulating the climate of the Arctic, a
region that suffers from climate change more than any other on the planet. We
gathered meteorological and aerosol physical and chemical data over a year and
utilized them for a parameterization that help us unravel the factors driving
and limiting the efficiency of cloud droplet formation. We then linked this
information to the sources of aerosol found during each season and to processes
of cloud glaciation.
Hide
08 Nov 2023
Mediterranean tropical-like cyclone forecasts and analysis using the ECMWF
ensemble forecasting system with physical parameterization perturbations
Miriam Saraceni, Lorenzo Silvestri, Peter Bechtold, and Paolina Bongioannini
Cerlini
Atmos. Chem. Phys., 23, 13883–13909,
https://doi.org/10.5194/acp-23-13883-2023,https://doi.org/10.5194/acp-23-13883-2023,
2023
Short summary
Short summary
This study focuses on three medicanes, tropical-like cyclones that form in the
Mediterranean Sea, studied by ensemble forecasting. This involved multiple
simulations of the same event by varying initial conditions and model physics
parameters, especially related to convection, which showed comparable results.
It is found that medicane development is influenced by the model's ability to
predict precursor events and the interaction between upper and lower atmosphere
dynamics and thermodynamics.
Hide
08 Nov 2023
Biomass-burning smoke's properties and its interactions with marine
stratocumulus clouds in WRF-CAM5 and southeastern Atlantic field campaigns
Calvin Howes, Pablo E. Saide, Hugh Coe, Amie Dobracki, Steffen Freitag, Jim M.
Haywood, Steven G. Howell, Siddhant Gupta, Janek Uin, Mary Kacarab, Chongai
Kuang, L. Ruby Leung, Athanasios Nenes, Greg M. McFarquhar, James Podolske, Jens
Redemann, Arthur J. Sedlacek, Kenneth L. Thornhill, Jenny P. S. Wong, Robert
Wood, Huihui Wu, Yang Zhang, Jianhao Zhang, and Paquita Zuidema
Atmos. Chem. Phys., 23, 13911–13940,
https://doi.org/10.5194/acp-23-13911-2023,https://doi.org/10.5194/acp-23-13911-2023,
2023
Short summary
Short summary
To better understand smoke properties and its interactions with clouds, we
compare the WRF-CAM5 model with observations from ORACLES, CLARIFY, and LASIC
field campaigns in the southeastern Atlantic in August 2017. The model
transports and mixes smoke well but does not fully capture some important
processes. These include smoke chemical and physical aging over 4–12 days, smoke
removal by rain, sulfate particle formation, aerosol activation into cloud
droplets, and boundary layer turbulence.
Hide
08 Nov 2023
Source apportionment of particle number size distribution at the street canyon
and urban background sites
Sami Daniel Harni, Minna Aurtela, Sanna Saarikoski, Jarkko Niemi, Harri Portin,
Hanna Manninen, Ville Leinonen, Pasi Aalto, Phil Hopke, Tuukka Petäjä, Topi
Rönkkö, and Hilkka Timonen
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2428,https://doi.org/10.5194/egusphere-2023-2428,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
In this study particle number size distribution data was used in a novel way in
positive matrix factorization analysis to find aerosol source profiles in the
area. Measurements were made in Helsinki at a street canyon and urban background
sites between February 2015 and June 2019. Five different aerosol sources were
identified. These sources underline the significance of traffic-related
emissions in urban environments despite recent improvements in emission
reduction technologies.
Hide
08 Nov 2023
Quantifying primary oxidation products in the OH-initiated reaction of benzyl
alcohol
Reina S. Buenconsejo, Sophia M. Charan, John H. Seinfeld, and Paul O. Wennberg
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2483,https://doi.org/10.5194/egusphere-2023-2483,
2023
Preprint under review for ACP (discussion: open, 2 comments)
Short summary
Short summary
We look at the atmospheric chemistry of a volatile chemical product (VCP),
benzyl alcohol. Benzyl alcohol and other VCPs may play a significant role in the
formation of urban smog. By better understanding the chemistry of VCPs like
benzyl alcohol, we may better understand observed data and how VCPs affect air
quality. We identify products formed from benzyl alcohol chemistry and use this
chemistry to understand how benzyl alcohol forms a key component of smog,
secondary organic aerosol.
Hide
08 Nov 2023
Revising VOC emissions speciation improves global simulations of ethane and
propane
Matthew James Rowlinson, Lucy Carpenter, Katie Read, Shalini Punjabi, Adedayo
Adedeji, Luke Fakes, Ally Lewis, Ben Richmond, Neil Passant, Tim Murrells,
Barron Henderson, Kelvin Bates, Deltev Helmig, and Mat Evans
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2557,https://doi.org/10.5194/egusphere-2023-2557,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Ethane and propane are volatile organic compounds emitted during human
activities which contribute to the formation of ozone, a greenhouse gas, and
affect the chemistry of the lower atmosphere. Atmospheric models tend to do a
poor job at reproducing the abundance of these compounds in the atmosphere. By
using regional estimates of their emission, rather than globally consistent
estimates, we can significantly improve the simulation of ethane in the model
and make some improvement for propane.
Hide
08 Nov 2023
Six years of continuous carbon isotope composition measurements of methane in
Heidelberg (Germany) – a study of source contributions and comparison to
emission inventories
Antje Hoheisel and Martina Schmidt
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2079,https://doi.org/10.5194/egusphere-2023-2079,
2023
Preprint under review for ACP (discussion: open, 1 comment)
Short summary
Short summary
In Heidelberg, Germany, methane and its stable carbon isotope composition have
been measured continuously with a cavity ring-down spectroscopy (CRDS) analyser
since April 2014. These six-year time series are analysed with the Miller-Tans
method for the isotopic composition of the sources, as well as seasonal
variations and trends in methane emissions. The source contributions derived
from atmospheric measurements were used to evaluate global and regional emission
inventories of methane.
Hide
07 Nov 2023
Aircraft ice-nucleating particle and aerosol composition measurements in the
western North American Arctic
Alberto Sanchez-Marroquin, Sarah L. Barr, Ian T. Burke, James B. McQuaid, and
Benjamin J. Murray
Atmos. Chem. Phys., 23, 13819–13834,
https://doi.org/10.5194/acp-23-13819-2023,https://doi.org/10.5194/acp-23-13819-2023,
2023
Short summary
Short summary
The sources and concentrations of ice-nucleating particles (INPs) in the Arctic
are still poorly understood. Here we report aircraft-based INP concentrations
and aerosol composition in the western North American Arctic. The concentrations
of INPs and all aerosol particles were low. The aerosol samples contained mostly
sea salt and dust particles. Dust particles were more relevant for the INP
concentrations than sea salt. However, dust alone cannot account for all of the
measured INPs.
Hide
07 Nov 2023
Secondary aerosol formation during a special dust transport event: impacts from
unusually enhanced ozone and dust backflows over the ocean
Da Lu, Hao Li, Mengke Tian, Guochen Wang, Xiaofei Qin, Na Zhao, Juntao Huo, Fan
Yang, Yanfen Lin, Jia Chen, Qingyan Fu, Yusen Duan, Xinyi Dong, Congrui Deng,
Sabur F. Abdullaev, and Kan Huang
Atmos. Chem. Phys., 23, 13853–13868,
https://doi.org/10.5194/acp-23-13853-2023,https://doi.org/10.5194/acp-23-13853-2023,
2023
Short summary
Short summary
Environmental conditions during dust are usually not favorable for secondary
aerosol formation. However in this study, an unusual dust event was captured in
a Chinese mega-city and showed “anomalous” meteorology and a special dust
backflow transport pathway. The underlying formation mechanisms of secondary
aerosols are probed in the context of this special dust event. This study shows
significant implications for the varying dust aerosol chemistry in the future
changing climate.
Hide
07 Nov 2023
Assessing the destructiveness of tropical cyclones induced by anthropogenic
aerosols in an atmosphere–ocean coupled framework
Yun Lin, Yuan Wang, Jen-Shan Hsieh, Jonathan H. Jiang, Qiong Su, Lijun Zhao,
Michael Lavallee, and Renyi Zhang
Atmos. Chem. Phys., 23, 13835–13852,
https://doi.org/10.5194/acp-23-13835-2023,https://doi.org/10.5194/acp-23-13835-2023,
2023
Short summary
Short summary
Tropical cyclones (TCs) can cause catastrophic damage to coastal regions. We
used a numerical model that explicitly simulates aerosol–cloud interaction and
atmosphere–ocean coupling. We show that aerosols and ocean coupling work
together to make TC storms bigger but weaker. Moreover, TCs in polluted air have
more rainfall and higher sea levels, leading to more severe storm surges and
flooding. Our research highlights the roles of aerosols and ocean-coupling
feedbacks in TC hazard assessment.
Hide
07 Nov 2023
Technical note: Gas-phase nitrate radical generation via irradiation of aerated
ceric ammonium nitrate mixtures
Andrew T. Lambe, Bin Bai, Masayuki Takeuchi, Nicole Orwat, Paul M. Zimmerman,
Mitchell W. Alton, Nga L. Ng, Andrew Freedman, Megan S. Claflin, Drew R.
Gentner, Douglas R. Worsnop, and Pengfei Liu
Atmos. Chem. Phys., 23, 13869–13882,
https://doi.org/10.5194/acp-23-13869-2023,https://doi.org/10.5194/acp-23-13869-2023,
2023
Short summary
Short summary
We developed a new method to generate nitrate radicals (NO3) for atmospheric
chemistry applications that works by irradiating mixtures containing ceric
ammonium nitrate with a UV light at room temperature. It has several advantages
over traditional NO3 sources. We characterized its performance over a range of
mixture and reactor conditions as well as other irradiation products. Proof of
concept was demonstrated by generating and characterizing oxidation products of
the β-pinene + NO3 reaction.
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07 Nov 2023
Lifecycle of Updrafts and Mass Flux in Isolated Deep Convection over the Amazon
Rainforest: Insights from Cell Tracking
Siddhant Gupta, Die Wang, Scott E. Giangrande, Thiago S. Biscaro, and Michael P.
Jensen
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2410,https://doi.org/10.5194/egusphere-2023-2410,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
We examine the lifecycle of isolated deep convective clouds (DCCs) in the Amazon
rainforest. Weather radar echoes from the DCCs are tracked to evaluate their
lifecycle. The DCC size and intensity increase, reach a peak, and then decrease
over the DCC lifetime. Vertical profiles of air motion and mass transport from
different seasons are examined to understand the transport of energy and
momentum within DCC cores and to address the deficiencies in simulating DCCs
using weather and climate models.
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07 Nov 2023
Dual roles of inorganic aqueous phase on SOA growth from benzene and phenol
Jiwon Choi, Myoseon Jang, and Spencer Blau
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2461,https://doi.org/10.5194/egusphere-2023-2461,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
A persistent phenoxy radical (PPR) effectively forms via a heterogeneous
reaction of phenol and phenol-related products in the presence of wet-inorganic
aerosol. These PPR can catalytically consume ozone during a NOx cycle and
negatively influence SOA formation. SOA formation from phenol or benzene is
simulated using the UNIPAR model which predicted SOA formation via multiphase
reactions of hydrocarbons and compared with chamber data obtained under varying
NOx levels, humidity, and seed types.
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06 Nov 2023
Air pollution trapping in the Dresden Basin from gray-zone scale urban modeling
Michael Weger and Bernd Heinold
Atmos. Chem. Phys., 23, 13769–13790,
https://doi.org/10.5194/acp-23-13769-2023,https://doi.org/10.5194/acp-23-13769-2023,
2023
Short summary
Short summary
This study investigates the effects of complex terrain on air pollution trapping
using a numerical model which simulates the dispersion of emissions under real
meteorological conditions. The additionally simulated aerosol age allows us to
distinguish areas that accumulate aerosol over time from areas that are more
influenced by fresh emissions. The Dresden Basin, a widened section of the Elbe
Valley in eastern Germany, is selected as the target area in a case study to
demonstrate the concept.
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06 Nov 2023
Benefits of net-zero policies for future ozone pollution in China
Zhenze Liu, Oliver Wild, Ruth M. Doherty, Fiona M. O'Connor, and Steven T.
Turnock
Atmos. Chem. Phys., 23, 13755–13768,
https://doi.org/10.5194/acp-23-13755-2023,https://doi.org/10.5194/acp-23-13755-2023,
2023
Short summary
Short summary
We investigate the impact of net-zero policies on surface ozone pollution in
China. A chemistry–climate model is used to simulate ozone changes driven by
local and external emissions, methane, and warmer climates. A deep learning
model is applied to generate more robust ozone projection, and we find that the
benefits of net-zero policies may be overestimated with the chemistry–climate
model. Nevertheless, it is clear that the policies can still substantially
reduce ozone pollution in future.
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06 Nov 2023
| Highlight paper
Opinion: A critical evaluation of the evidence for aerosol invigoration of deep
convection
Adam C. Varble, Adele L. Igel, Hugh Morrison, Wojciech W. Grabowski, and Zachary
J. Lebo
Atmos. Chem. Phys., 23, 13791–13808,
https://doi.org/10.5194/acp-23-13791-2023,https://doi.org/10.5194/acp-23-13791-2023,
2023
Short summary Executive editor
Short summary
As atmospheric particles called aerosols increase in number, the number of
droplets in clouds tends to increase, which has been theorized to increase storm
intensity. We critically evaluate the evidence for this theory, showing that
flaws and limitations of previous studies coupled with unaddressed cloud process
complexities draw it into question. We provide recommendations for future
observations and modeling to overcome current uncertainties.
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Executive editor
This provocative opinion piece examines the theoretical, numerical, and
observational evidence in support of two highly cited proposed mechanisms for
invigorating deep convective clouds through higher aerosol concentrations. Both
start with high concentrations of water droplets. Through cold-phase
invigoration, precipitation is reduced allowing for greater release of latent
heat from freezing higher up in clouds. With warm-phase invigoration, increased
latent heating occurs lower down due to accelerated liquid condensation. In both
cases, the article persuasively argues from a variety of standpoints that the
evidence to support the importance of the effects is weak, particularly once the
full complexity of clouds and their interactions with their environment is fully
taken into account. Concrete suggestions are made for improving definition,
observations, and modeling of the problem, but also an admonishment that
attention in the field might be better directed towards more fruitful aspects of
the aerosol-cloud interaction problem.
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06 Nov 2023
The effect of atmospherically relevant aminium salts on water uptake
Noora Hyttinen
Atmos. Chem. Phys., 23, 13809–13817,
https://doi.org/10.5194/acp-23-13809-2023,https://doi.org/10.5194/acp-23-13809-2023,
2023
Short summary
Short summary
Water activity in aerosol particles describes how particles respond to
variations in relative humidity. Here, water activities were calculated for a
set of 80 salts that may be present in aerosol particles using a
state-of-the-art quantum-chemistry-based method. The effect of the dissociated
salt on water activity varies with both the cation and anion. Most of the
studied salts increase water uptake compared to pure water-soluble organic
particles.
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06 Nov 2023
Droplet collection efficiencies estimated from satellite retrievals constrain
effective radiative forcing of aerosol-cloud interactions
Charlotte M. Beall, Po-Lun Ma, Matthew W. Christensen, Johannes Mülmenstädt,
Adam Varble, Kentaroh Suzuki, and Takuro Michibata
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2161,https://doi.org/10.5194/egusphere-2023-2161,
2023
Preprint under review for ACP (discussion: open, 2 comments)
Short summary
Short summary
Single-layer warm liquid clouds cover nearly one-third of the earth's surface,
and uncertainties regarding the impact of aerosols on their radiative properties
pose a significant challenge to climate prediction. Here, we demonstrate how
satellite observations can be used to constrain Earth Systems Model estimates of
the radiative forcing due to the interactions of aerosols with clouds due to
warm rain processes.
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06 Nov 2023
Soot aerosol from commercial aviation engines are poor ice nucleating particles
at cirrus cloud temperatures
Baptiste Testa, Lukas Durdina, Peter A. Alpert, Fabian Mahrt, Christopher H.
Dreimol, Jacinta Edebeli, Curdin Spirig, Zachary C. J. Decker, Julien Anet, and
Zamin A. Kanji
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2441,https://doi.org/10.5194/egusphere-2023-2441,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Laboratory experiments on the ice nucleation of real commercial aviation soot
particles are investigated for their cirrus cloud formation potential. Our
results show that aircraft emitted soot in the upper troposphere will be poor
ice nucleating particles. Measuring the soot particle morphology and modifying
their mixing state allows us to elucidate why these particles are ineffective at
forming ice, in contrast to previously used soot surrogates.
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06 Nov 2023
From CO2 emissions to atmospheric NO2 mixing ratios: simulating chemical
processes and their impacts on TROPOMI retrievals over the Middle East
Ioannis Cheliotis, Thomas Lauvaux, Jinghui Lian, Theodoros Christoudias, George
Georgiou, Alba Badia, Frédéric Chevallier, Pramod Kumar, Yathin Kudupaje, Ruixue
Lei, and Philippe Ciais
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2487,https://doi.org/10.5194/egusphere-2023-2487,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
A consistent estimation of CO2 emissions is complicated due to the scarcity of
CO2 observations. In this study, we showcase the potential to improve the CO2
emissions estimations from the NO2 concentrations based on the NO2-to-CO2 ratio,
which should be constant for a source co-emitting NO2 and CO2, by comparing
satellite observations with atmospheric chemistry and transport model
simulations for NO2 and CO2. Furthermore, we demonstrate the significance of the
chemistry in NO2 simulations.
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06 Nov 2023
Opinion: Strengthening Research in the Global South: Atmospheric Science
Opportunities in South America and Africa
Rebecca M. Garland, Katye E. Altieri, Laura Dawidowski, Laura Gallardo, Aderiana
Mbandi, Nestor Y. Rojas, and N'datchoh E. Touré
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2566,https://doi.org/10.5194/egusphere-2023-2566,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
In this opinion, we focus on two geographical areas in the Global South to
discuss some common challenges and constraints, with a focus on our strengths in
atmospheric science research. It is these strengths, we believe, that highlight
the critical role of Global South researchers in the future of atmospheric
science research.
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06 Nov 2023
Bias characterization of OMI HCHO columns based on FTIR and aircraft
measurements and impact on top-down emission estimates
Jean-François Müller, Trissevgeni Stavrakou, Glenn-Michael Oomen, Beata Opacka,
Isabelle De Smedt, Alex Guenther, Corinne Vigouroux, Bavo Langerock, Carlos
Augusto Bauer Aquino, Michel Grutter, James Hannigan, Frank Hase, Rigel Kivi,
Erik Lutsch, Emmanuel Mahieu, Maria Makarova, Jean-Marc Metzger, Isamu Morino,
Isao Murata, Tomoo Nagahama, Justus Notholt, Ivan Ortega, Mathias Palm, Amelie
Röhling, Wolfgang Stremme, Kimberly Strong, Ralf Sussmann, Yao Té, and Alan
Fried
EGUsphere,
https://doi.org/10.5194/egusphere-2023-2456,https://doi.org/10.5194/egusphere-2023-2456,
2023
Preprint under review for ACP (discussion: open, 0 comments)
Short summary
Short summary
Formaldehyde observations from satellites can be used to constrain the emissions
of volatile organic compounds, but those observations have biases. Using an
atmospheric model, aircraft and ground-based remote sensing data, we quantify
these biases, propose a correction to the data, and assess the consequence of
this correction for the evaluation of emissions.
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