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Title: The DOE E3SM v1.1 Biogeochemistry Configuration: Description and Simulated Ecosystem-Climate Responses to Historical Changes in Forcing

Journal Article · · Journal of Advances in Modeling Earth Systems
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  1. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  6. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  7. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  8. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Colorado State University, Fort Collins, CO (United States)
  9. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  10. University of Houston, TX (United States)
  11. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Pacific Northwest National Laboratory (PNNL), College Park, MD (United States)
  12. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of Tennessee, Knoxville, TN (United States)

This paper documents the biogeochemistry configuration of the Energy Exascale Earth System Model (E3SM), E3SMv1.1-BGC. The model simulates historical carbon cycle dynamics, including carbon losses predicted in response to land use and land cover change, and the responses of the carbon cycle to changes in climate. In addition, we introduce several innovations in the treatment of soil nutrient limitation mechanisms, including explicit dependence on phosphorus availability. The suite of simulations described here includes E3SM contributions to the Coupled Climate-Carbon Cycle Model Intercomparison Project and other projects, as well as simulations to explore the impacts of structural uncertainty in representations of nitrogen and phosphorus limitation. We describe the model spin-up and evaluation procedures, provide an overview of results from the simulation campaign, and highlight key features of the simulations. Cumulative warming over the twentieth century is similar to observations, with a midcentury cold bias offset by stronger warming in recent decades. Ocean biomass production and carbon uptake are underpredicted, likely due to biases in ocean transport leading to widespread anoxia and undersupply of nutrients to surface waters. The inclusion of nutrient limitations in the land biogeochemistry results in weaker carbon fertilization and carbon-climate feedbacks than exhibited by other Earth System Models that exclude those limitations. Finally, we compare with an alternative representation of terrestrial biogeochemistry, which differs in structure and in initialization of soil phosphorus. While both configurations agree well with observational benchmarks, they differ significantly in their distribution of carbon among different pools and in the strength of nutrient limitations.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231; AC05-76RLO1830; AC52-07NA27344; 89233218CNA000001; Energy Exascale Earth System Model (E3SM) project; Reducing Uncertainties in Biogeochemical Interactions through Synthesis and Computation (RUBISCO) Sc; DE‐AC02‐05CH11231; DE‐AC05‐76RLO1830; DE‐AC05‐00OR22725; DE‐AC52‐07NA27344
OSTI ID:
1664633
Alternate ID(s):
OSTI ID: 1666016; OSTI ID: 1682248; OSTI ID: 1735543; OSTI ID: 1776657; OSTI ID: 1786749; OSTI ID: 1897347
Report Number(s):
LLNL-JRNL-823089; PNNL-SA-144279; LLNL-JRNL-776397; 1035859
Journal Information:
Journal of Advances in Modeling Earth Systems, Vol. 12, Issue 9; ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 51 works
Citation information provided by
Web of Science

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Figures / Tables (31)