A5066392729- Atmospheric and Environmental Gas Dynamics
- Plant Water Relations and Carbon Dynamics
- Climate variability and models
- Climate change and permafrost
- Magnetism in coordination complexes
- Peatlands and Wetlands Ecology
- Metal complexes synthesis and properties
- Soil Carbon and Nitrogen Dynamics
- Meteorological Phenomena and Simulations
- Cryospheric studies and observations
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Hydrology and Watershed Management Studies
- Organometallic Complex Synthesis and Catalysis
- Remote Sensing in Agriculture
- Fire effects on ecosystems
- Lanthanide and Transition Metal Complexes
- Soil and Water Nutrient Dynamics
- Inorganic Chemistry and Materials
- Species Distribution and Climate Change
- X-ray Diffraction in Crystallography
- Plant responses to elevated CO2
- Forest ecology and management
- Atmospheric chemistry and aerosols
- Metal-Catalyzed Oxygenation Mechanisms
Oak Ridge National Laboratory
2016-2025
Office of Scientific and Technical Information
2024
Predictive Science (United States)
2023
Government of the United States of America
2023
Engineering Software Research and Development (United States)
2022
Impact
2022
NSF National Center for Atmospheric Research
2002-2014
University of Michigan–Ann Arbor
2010
Climate and Global Dynamics Laboratory
2002-2009
University of Montana
1996-2001
In preparation for the fifth Assessment Report (AR5) of Intergovernmental Panel on Climate Change (IPCC), international community is developing new advanced Earth System Models (ESMs) to assess combined effects human activities (e.g. land use and fossil fuel emissions) carbon-climate system. addition, four Representative Concentration Pathway (RCP) scenarios future (2005–2100) are being provided by Integrated Model (IAM) teams be used as input ESMs projections (Moss et al. 2010). The...
The Community Land Model is the land component of Climate System Model.Here, we describe a broad set model improvements and additions that have been provided through CLM development community to create CLM4.The extended with carbon-nitrogen (CN) biogeochemical prognostic respect vegetation, litter, soil carbon nitrogen states vegetation phenology.An urban canyon added transient cover use change (LCLUC) capability, including wood harvest, introduced, enabling study historic future LCLUC on...
Regional phenology is important in ecosystem simulation models and coupled biosphere/atmosphere models. In the continental United States, timing of onset greenness spring (leaf expansion, grass green‐up) offset fall abscission, cessation height growth, brown‐off) are strongly influenced by meteorological climatological conditions. We developed predictive based on traditional research using commonly available data. Predictions were compared with satellite observations at numerous 20 km ×...
Aim To estimate the concentrations, stoichiometry and storage of soil microbial biomass carbon (C), nitrogen (N) phosphorus (P) at biome global scales. Location Global. Method We collected 3422 data points to summarize concentrations C, N P in soils, levels, C N. Results The results show that soils vary substantially across biomes; fractions elements are 1.2, 2.6 8.0%, respectively. best estimates C:N:P for 287:17:1 42:6:1, respectively, scale, they a wide range among biomes. vertical...
Ecosystem simulation models use descriptive input parameters to establish the physiology, biochemistry, structure, and allocation patterns of vegetation functional types, or biomes. For single-stand simulations it is possible measure required data, but as spatial resolution increases, so too does data unavailability. Generalized biome parameterizations are then required. Undocumented parameter selection unknown model sensitivity variation for larger-resolution currently major limitations...
The Community Land Model version 3 (CLM3) is the land component of Climate System (CCSM). CLM3 has energy and water biases resulting from deficiencies in some its canopy soil parameterizations related to hydrological processes. Recent research by community that utilizes family CCSM models indicated several promising approaches alleviating these biases. This paper describes implementation a selected set their effects on simulated cycle. modifications consist surface data sets based Moderate...
The Community Land Model is the land component of Climate System Model.Here, we describe a broad set model improvements and additions that have been provided through CLM development community to create CLM4.The extended with carbon-nitrogen (CN) biogeochemical prognostic respect vegetation, litter, soil carbon nitrogen states vegetation phenology.An urban canyon added transient cover use change (LCLUC) capability, including wood harvest, introduced, enabling study historic future LCLUC on...
Abstract. Human land use activities have resulted in large changes to the biogeochemical and biophysical properties of Earth's surface, with consequences for climate other ecosystem services. In future, are likely expand and/or intensify further meet growing demands food, fiber, energy. As part World Climate Research Program Coupled Model Intercomparison Project (CMIP6), international community has developed next generation advanced Earth system models (ESMs) estimate combined effects human...
Nutrient cycling affects carbon uptake by the terrestrial biosphere and imposes controls on cycle response to variation in temperature precipitation, but nutrient is ignored most global coupled models of climate system. We demonstrate here that inclusion dynamics, specifically close coupling between nitrogen cycles, a biogeochemistry component system model leads fundamentally altered behavior for several critical feedback mechanisms operating land Carbon‐nitrogen reduces simulated increasing...
This work documents the first version of U.S. Department Energy (DOE) new Exascale Earth System Model (E3SMv1). We focus on standard resolution fully coupled physical model designed to address DOE mission-relevant water cycle questions. Its components include atmosphere and land (110-km grid spacing), ocean sea ice (60 km in midlatitudes 30 at equator poles), river transport (55 km) models. base configuration will also serve as a foundation for additional configurations exploring higher...
The effects of increasing carbon dioxide (CO2) and climate on net storage in terrestrial ecosystems the conterminous United States for period 1895-1993 were modeled with new, detailed historical information. For 1980-1993, results from an ensemble three models agree within 25%, simulating a land sink CO2 0.08 gigaton per year. best estimates total inventory data are about times larger, suggesting that processes such as regrowth abandoned agricultural or forests harvested before 1980 have...
Abstract Although the global partitioning of evapotranspiration (ET) into transpiration, soil evaporation, and canopy evaporation is not well known, most current land surface schemes few available observations indicate that transpiration dominant component on scale, followed by evaporation. The Community Land Model version 3 (CLM3), however, does reflect this view ET partitioning, with far outweighing transpiration. One consequence unrealistic in CLM3 photosynthesis, which linked to through...
Abstract. Inclusion of fundamental ecological interactions between carbon and nitrogen cycles in the land component an atmosphere-ocean general circulation model (AOGCM) leads to decreased uptake associated with CO2 fertilization, increased warming climate system. The balance these two opposing effects is reduce fraction anthropogenic predicted be sequestered ecosystems. primary mechanism responsible for storage under radiatively forced change shown fertilization plant growth by...
Abstract. Desert dust perturbs climate by directly and indirectly interacting with incoming solar outgoing long wave radiation, thereby changing precipitation temperature, in addition to modifying ocean land biogeochemistry. While we know that desert is sensitive perturbations human use, previous studies have been unable determine whether humans were increasing or decreasing the global average. Here present observational estimates of based on paleodata proxies showing a doubling during 20th...
Summary We analysed the responses of 11 ecosystem models to elevated atmospheric [ CO 2 ] (e ) at two temperate forest ecosystems ( D uke and Oak Ridge National Laboratory ORNL F ree‐ A ir E nrichment FACE experiments) test alternative representations carbon C )–nitrogen N cycle processes. decomposed model into component processes affecting response e confronted these with observations from experiments. Most reproduced observed initial enhancement net primary production NPP both sites, but...
Abstract We compared carbon storage and fluxes in young old ponderosa pine stands Oregon, including plant soil storage, net primary productivity, respiration fluxes, eddy flux estimates of ecosystem exchange ( NEE ), Biome‐BGC simulations fluxes. The forest (Y site) was previously an old‐growth that had been clearcut 1978, the (O site), which has never logged, consists two age classes (50 250 years old). Total content (vegetation, detritus soil) O about twice Y site (21 vs. 10 kg C m −2...