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NGEE–Tropics

Next-Generation Ecosystem Experiments

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Tropical forests cover less than 7% of Earth's surface, but...

...tropical forests cycle more CO2, water, and energy than ANY other biome.

That cycling plays a major role in regulating Earth's climate.

NGEE-Tropics is advancing our understanding of tropical forest carbon cycling,
and associated water and energy fluxes.

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THE FUTURE OF TROPICAL FORESTS MATTER TO FUTURE CLIMATE.
NGEE-TROPICS IS ADVANCING MODEL PREDICTIONS OF TROPICAL FOREST CARBON CYCLE
RESPONSES TO A CHANGING CLIMATE OVER THE 21ST CENTURY.

Our Research

Modeling
NGEE-Tropics focuses on the state-of-the-science measurements and model
development most critical to projecting tropical forest carbon cycling and
associated energy and water fluxes. Current Earth system models typically are
simplistic in their representation of the processes controlling the tropical
forest carbon cycling, and observational datasets to constrain model projections
are insufficient, resulting in  large uncertainties in projections of their
responses to future climate scenarios. In addition, many models are built in a
way that makes comparing simulations with field data extremely challenging.
NGEE-Tropics envisions  a greatly improved predictive capacity for tropical
forest responses and feedbacks to global change. This capacity ... Read More
Data
To improve tropical forest representation in Earth system models (ESMs),
NGEE-Tropics is carrying out field and lab studies to generate key data, and
integrate diverse existing data with this new data. The resulting data products
are valuable for model development, parameterization, and testing. The
NGEE-Tropics Data Synthesis and Management Framework includes infrastructure for
archiving project data collections, and for defining and building data synthesis
and analysis products needed as model parameters and benchmarks. The FATES
modeling efforts need meteorological-driven datasets generated through
consistent QA/QC and gap-filling protocols for intercomparison of cross-site
simulation results. In addition, key data for benchmarking such ... Read More
Field
The NGEE Tropics project team selected sites for Phase 2 that are essential to
attaining our goals and deliverables. Our Phase 2 work will build on
infrastructure developed at Phase 1 pilot sites. We will also leverage extensive
infrastructure and logistical support for additional Phase 2 sites with our
international partners and collaborators. Developing FATES and ModEx from
regional to continental perspectives requires defining the gradient change in
the measured variables that represent key model drivers and establishing
boundary conditions to evaluate the model’s ability to accurately simulate key
emergent benchmarks. Puerto Rico offers an excellent regional testbed for
exploring ... Read More
Research Focus Area 1
RFA1: Climate change effects on tree function, stress response, and mortality. 
How do drought and elevated temperature related to climate change impact tree
physiology and mortality? Phase 2 research will focus on advancing understanding
of water sourcing, hydrodynamics, tree canopy exchange of CO2 and water, carbon
storage, plant respiration, defense strategies, and damage associated with
elevated tree mortality risks. RFA1 will provide new understanding and model
representation of physiological processes that enable FATES to more accurately
predict forest functional response, damage, and tree mortality as a response to
drought and elevated temperature. Plant water sourcing. Using existing and new
data ... Read More
Research Focus Area 2
RFA2: Forest structure and composition along environmental gradients. How do
forest structure and composition vary in response to plant available water, soil
fertility, and disturbance? Representing tropical forest structure and
functional composition, and how they mediate responses to climate and
disturbance from ecosystem to Earth-system scales are key innovations that FATES
provides to E3SM. During Phase 2 the NGEE-Tropics team will focus on developing
accurate representations of forest composition and functional diversity as they
relate to water and nutrient availability, and disturbance regimes.  To support
this activity, we will investigate mechanisms which can lead to stable
functional coexistence in FATES. ... Read More
Research Focus Area 3
RFA3: Tropical forests and coupled Earth system processes. How do precipitation
recycling and the seasonal timing of precipitation respond to changes in forest
structure and Earth’s climate? Over continental scales precipitation recycling,
defined as the contribution of local evaporation to local precipitation, and the
seasonal timing of precipitation are sensitive to changes in climate forcing and
forest structure. RFA3 explores and improves modeling of the role soil hydrology
plays in plant response to climate forcing, develops new data products to serve
as model benchmarks, and implements fully coupled E3SM-FATES interactions at
regional and global scales. Because of its strong sensitivities to ... Read More
Recent News


LARGE ANTHROPOGENIC AND NATURAL CARBON LOSSES IN THE AMAZON ARC OF DEFORESTATION

AIRBORNE LASER SCANNING REVEALS THE IMPACTS OF HUMAN ACTIVITIES AND NATURAL
DISTURBANCES IN A CRITICAL REGION FOR CARBON DYNAMICS IN

FATES VEGETATION-FIRE MODEL PREDICTS TROPICAL ECOSYSTEM BIOGEOGRAPHY

SIMULATED FEEDBACKS BETWEEN FIRE BEHAVIOR AND VEGETATION TRAITS DRIVE EMERGENT
PATTERNS. IMAGE COURTESY OF JACQUELYN K. SHUMAN, NASA AMES RESEARCH

HYSTERESIS AREA AT THE CANOPY LEVEL DURING AND AFTER A DROUGHT EVENT IN THE
CENTRAL

THE CHANGES IN HYSTERESIS AREA DURING THE 2015 ENSO DROUGHT COMPARED TO THE
POST-DROUGHT PERIOD HIGHLIGHT THE RISK OF HYDRAULIC FAILURE OF

CALIBRATION OF THE SMAP SOIL MOISTURE RETRIEVAL ALGORITHM TO REDUCE BIAS OVER
THE AMAZON RAINFOREST

BERKELEY LAB SCIENTISTS USING GROUND-BASED OBSERVATIONS OF SOIL MOISTURE (SM)
DATA FROM THE NEXT-GENERATION ECOSYSTEM EXPERIMENT-TROPICS (NGEE-TROPICS) HAVE
SHOWN THAT

See All News
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