HR: 0800h
AN: B31B-0324
TI: Results from the CCSM Carbon-Land Model Intercomparison Project (C-LAMP)
AU: * Hoffman, F M
EM: forrest@climatemodeling.org
AF: Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6016, United States
AU: Randerson, J T
EM: jranders@uci.edu
AF: University of California, Irvine, 3212 Croul Hall, Irvine, CA 92697, United States
AU: Fung, I
EM: ifung@berkeley.edu
AF: University of California, Berkeley, 399 McCone Hall, Berkeley, CA 94720, United States
AU: Thornton, P
EM: thornton@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80305, United States
AU: Lee, Y J
EM: jeff@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80305, United States
AU: Covey, C C
EM: covey1@llnl.gov
AF: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, United States
AB: The National Center for Atmospheric Research (NCAR) Community Climate System Model (CCSM) Biogeochemistry Working Group has initiated an intercomparison of terrestrial biosphere models running within the CCSM framework. Called the CCSM Carbon-Land Model Intercomparison Project (C-LAMP), its purpose is to allow the U.S. scientific community to evaluate the performance of biogeochemical cycling models within CCSM and to identify the most important processes for inclusion in future versions of CCSM. Two terrestrial biogeochemistry modules coupled to CCSM---CLM3-CASA' and CLM3-CN---have been evaluated following a set of carefully crafted experiments that build upon the C⁴MIP Phase 1 protocol. In Experiment 1, the models were forced with an improved NCEP/NCAR reanalysis data set, while in Experiment 2, the models were coupled to the Community Atmosphere Model Version 3 (CAM3) with carbon, water, and energy exchanges over the 20th century. Unlike with most model intercomparisons, for C-LAMP a model performance methodology based on comparison against best-available observational data sets has been developed. Scalar metrics for each model are derived from comparisons against measurements of net primary production, leaf area index, the seasonal cycle of CO₂, carbon stocks, and energy. Results from both experiments for CLM3- CASA' and CLM3-CN will be presented, along with recommendations for future evaluations of terrestrial models. C-LAMP model output will be made available by the Program for Climate Model Diagnosis and Intercomparison (PCMDI) via the Earth System Grid (ESG). C-LAMP is a sub-project of the Computational Climate Science End Station headed by Dr. Warren Washington, using computing resources at the U.S. Department of Energy's National Center for Computational Sciences (NCCS).
UR: http://www.climatemodeling.org/bgcmip/
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0426 Biosphere/atmosphere interactions (0315)
DE: 0428 Carbon cycling (4806)
DE: 0429 Climate dynamics (1620)
DE: 0430 Computational methods and data processing
SC: Biogeosciences [B]
MN: 2007 Fall Meeting