Community Land Model (CLM)

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Presentation transcript:

Community Land Model (CLM) Website and Tech Notes http://www.cesm.ucar.edu/models/clm/ http://www.cesm.ucar.edu/models/cesm1.1/clm/CLM4_Tech_Note.pdf CLM is the land model for the Community Earth System Model (CESM) It is a collaborative project between scientists Terrestrial Sciences Section (TSS) Climate and Global Dynamics Division (CGD) National Center for Atmospheric Research (NCAR) CLM is a computer model that solves surface energy, water, carbon balances at the Global Scale It examines the physical, chemical, and biological processes that terrestrial ecosystems affect CLM also formalizes and quantifies how natural and human changes in vegetation affects climate Some assumptions of CLM Decomposition rates of all soil and litter organic C pools are equally sensitive to temperature More N mineralization in warmer soil: positive impact on NPP and ET in tropics Spatial scale 1.25º longitude × 0.9375º latitude (288 × 192 grid) 2.5º longitude × 1.875º latitude (144 × 96 grid) Temporal scale 30-minute coupling with atmosphere Seasonal-to-interannual (phenology) Decadal-to-century climate (disturbance, land use, succession) Paleoclimate (biogeography)

CLM Model Represents the Land Surface Including: Surface Energy Fluxes, Hydrologic Cycle, Biogeochemistry, Human Dimensions + Ecosystem Dynamics Specific processes that are represented are below: Vegetation composition, structure, and phenology Absorption, reflection, and transmittance of solar radiation Absorption and emission of longwave radiation Momentum, sensible heat (ground and canopy), and latent heat (ground evaporation, canopy evaporation, transpiration) fluxes Heat transfer in soil and snow including phase change Canopy hydrology (interception, throughfall, and drip) Snow hydrology (snow accumulation and melt, compaction, water transfer between snow layers) Soil hydrology (surface runoff, infiltration, redistribution of water within the column, sub-surface drainage, groundwater) Stomatal physiology and photosynthesis Lake temperatures and fluxes Dust deposition and fluxes Routing of runoff from rivers to ocean Volatile organic compounds emissions Urban energy balance and climate Carbon-nitrogen cycling Dynamic land cover change Dynamic global vegetation