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Title: The CCSM4 Land Simulation, 1850–2005: Assessment of Surface Climate and New Capabilities

Journal Article · · Journal of Climate
 [1];  [1];  [2];  [3];  [1];  [1];  [1];  [1]
  1. National Center for Atmospheric Research, Boulder, CO (United States). Earth System Lab., and Climate and Global Dynamics Division
  2. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Atmospheric, Oceanic, and Space Sciences
  3. Univ. of Toronto, ON (Canada). Dept. of Physics

This paper reviews developments for the Community Land Model, version 4 (CLM4), examines the land surface climate simulation of the Community Climate System Model, version 4 (CCSM4) compared to CCSM3, and assesses new earth system features of CLM4 within CCSM4. CLM4 incorporates a broad set of improvements including additions of a carbon–nitrogen (CN) biogeochemical model, an urban canyon model, and transient land cover and land use change, as well as revised soil and snow submodels. Several aspects of the surface climate simulation are improved in CCSM4. Improvements in the simulation of soil water storage, evapotranspiration, surface albedo, and permafrost that are apparent in offline CLM4 simulations are generally retained in CCSM4. The global land air temperature bias is reduced and the annual cycle is improved in many locations, especially at high latitudes. The global land precipitation bias is larger in CCSM4 because of bigger wet biases in central and southern Africa and Australia. New earth system capabilities are assessed. The present-day air temperature within urban areas is warmer than surrounding rural areas by 1°–2°C, which is comparable to or greater than the change in climate occurring over the last 130 years. The snow albedo feedback is more realistic and the radiative forcing of snow aerosol deposition is calculated as +0.083 W m-2 for present day. The land carbon flux due to land use, wildfire, and net ecosystem production is a source of carbon to the atmosphere throughout most of the historical simulation. CCSM4 is increasingly suited for studies of the role of land processes in climate and climate change.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); UT-Battelle LLC/ORNL, Oak Ridge, TN (United States); University Corporation for Atmospheric Research, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; FC03-97ER62402
OSTI ID:
1564910
Journal Information:
Journal of Climate, Vol. 25, Issue 7; ISSN 0894-8755
Publisher:
American Meteorological SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 241 works
Citation information provided by
Web of Science

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North Atlantic winter eddy-driven jet and atmospheric blocking variability in the Community Earth System Model version 1 Large Ensemble simulations journal January 2018
The role of large—scale BECCS in the pursuit of the 1.5°C target: an Earth system model perspective journal March 2018
Influence of dynamic vegetation on carbon-nitrogen cycle feedback in the Community Land Model (CLM4) journal December 2016
Factors affecting projected Arctic surface shortwave heating and albedo change in coupled climate models
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