The Community Land Model Version 5: Description of New Features, Benchmarking, and Impact of Forcing Uncertainty

Abstract The Community Land Model (CLM) is the land component of the Community Earth System Model (CESM) and is used in several global and regional modeling systems. In this paper, we introduce model developments included in CLM version 5 (CLM5), which is the default land component for CESM2. We assess an ensemble of simulations, including prescribed and prognostic vegetation state, multiple forcing data sets, and CLM4, CLM4.5, and CLM5, against a range of metrics including from the International Land Model Benchmarking (ILAMBv2) package. CLM5 includes new and updated processes and parameterizations: (1) dynamic land units, (2) updated parameterizations and structure for hydrology and snow (spatially explicit…

• NS
  National Science Foundation

  Awards: 1852977, DEB-1153401, D6RX99HX, 2015-67003-23485, 1153401
• UD
  U.S. Department of Energy

  Awards: 2015-67003-23485, DE-SC0016188, 1852977, DE-SC0008317
• NA
  National Aeronautics and Space Administration

  Awards: 1852977, NNX17AK19G, 2015-67003-23485
• UD
  U.S. Department of Agriculture

  Awards: 2015-67003-23485, 2015‐67003‐23485, 1852977
• NC
  National Center for Atmospheric Research
• CI
  California Institute of Technology
• NI
  National Institute of Food and Agriculture

  Awards: 2015-67003-23485, 1852977
• OO
  Office of Science

  Awards: DE-SC0008317, DE-SC0016188
• JP
  Jet Propulsion Laboratory
• NS
  National Science Foundation of Sri Lanka

  Award: 1852977
• BA
  Biological and Environmental Research

  Awards: 1852977, DE-SC0008317, DE-SC0016188