Community Land Model Status and Plans Ecology And

Community Land Model: Status and Plans Ecology And Biogeochemistry (Joint with BGC working group) Research Goal: What is the contribution of terrestrial ecosystems to climate sensitivity? Terrestrial carbon cycle Finalize carbon/nitrogen cycle code Climate simulations Challenge: computational resources for multi-century spinup simulations Wildfire Develop new fire module (Jim Randerson, UC Irvine) Vegetation dynamics Merge static biogeography of CN model with prognostic biogeography of DGVM

Land Use As A Climate Forcing Research Goal: Much of the present-day natural vegetation has been cleared for agricultural land. By 2100, there is likely to be further expansion of agricultural land in North America, South America, Africa, and Southeast Asia. What is the land use forcing relative to other natural and anthropogenic forcings? Agricultural practices Develop model of agroecosystems (University of Wisconsin [Chris Kucharik, Navin Ramankutty, Jon Foley]) Urbanization Develop urban land cover parameterization (University of Kansas [Johan Feddema]) Soil degradation Add effects of soil degradation to CLM (University of Kansas [Johan Feddema]) Transient land cover change Develop datasets of historical and future land cover change (KU [Feddema]/Wisconsin [Ramankutty]/CU [Peter Lawrence]) Challenge Computational burden is high. Have done 50 -year 1870 spinup (T 85). How to get computer resources for transient simulation (1870 -2100) to complement IPCC simulations?

Hydrologic Biases Research Goal: Improve the hydrologic cycle in the Amazon Action plan endorsed by LMWG during March 2005 meeting • Interception • Canopy conductance • Surface runoff • Subsurface runoff • Soil physics (hydraulic conductivity) • Hydraulic lift by plants • Surface datasets Collaborators Robert Dickinson, Georgia Institute of Technology Guo-Yue Niu, University of Texas Zong-Liang Yang, University of Texas Jung-Eun Lee, University of California Berkeley Peter Lawrence, University of Colorado

Software Engineering Research Goal: Add prognostic canopy air space to CLM to improve diurnal cycle of surface fluxes and to facilitate isotope work Action plan endorsed by LMWG is to use the numerical scheme of Si. B 3 Collaborators Ian Baker, Colorado State University Sott Denning, Colorado State University Forrest Hoffman, ORNL Challenge Requires an extensive re-write of CLM biogeophysics and hydrology. Forrest Hoffman (ORNL) and Mariana Vertenstein (NCAR) will provide software engineering support. Research Goal: Add a high resolution (5 -minute grid) river routing model with the goal of simulating dynamic lakes and wetlands and human impacts on rivers Collaborator Mike Coe, Woods Hole Research Center Challenge Need to make the current river routing model an ESMF gridded component, communicating with CLM through an ESMF coupler with its own grid, history files, restart files, etc. Mariana Vertenstein (NCAR) will provide software engineering support.

Additional Activities Research Goal: Create a high resolution version of CLM for the U. S. to study the impact of climate variability and climate change on: • National land management issues – water resources, wildfires, agriculture, urbanization, carbon sequestration • Human health – heat stress, infectious diseases Ongoing Efforts • Subgrid orography (Steve Ghan, PNL) • Downscaling • WRF Challenge Need additional scientific and software engineering support to coordinate various projects Research Goal: The Variable Infiltration Capacity (VIC) model is a leading macroscale hydrologic model. We want to bring the VIC hydrology into the CLM to see if it improves the simulation of the hydrologic cycle Collaborators Dennis Lettenmaier (University of Washington) Eric Wood (Princeton) Challenge What scientific support can NCAR provide?