Community Land Model is the land model for the Community
Earth System Model (CESM) and the Community
Atmosphere Model (CAM).
It is a collaborative project between
scientists in the Terrestrial Sciences
Section (TSS) and the Climate
and Global Dynamics Division (CGD) at the National
Center for Atmospheric Research (NCAR) and the CESM
Land Model Working Group. Other principal
working groups that also contribute to the CLM are
Biogeochemistry, Paleoclimate, and Climate Change
The model formalizes and quantifies
concepts of ecological climatology. Ecological climatology
is an interdisciplinary framework to understand how
natural and human changes in vegetation affect climate.
It examines the physical, chemical, and biological
processes by which terrestrial ecosystems affect
and are affected by climate across a variety of spatial
and temporal scales. The central theme is that terrestrial
ecosystems, through their cycling of energy, water,
chemical elements, and trace gases, are important
determinants of climate.
Model components consist of: biogeophysics, hydrologic cycle, biogeochemistry
and dynamic vegetation.
The land surface is represented by 5 primary sub-grid land cover
types (glacier, lake, wetland, urban, vegetated) in each grid cell. The vegetated
portion of a grid cell is further divided into patches of plant
each with its own leaf and stem area index and canopy height. Each subgrid land
cover type and PFT patch is a separate column for energy and water calculations.
The current version of the Community Land Model is CLM4.0