HR: 1340h
AN: B33A-0236    [Abstracts]
TI: Carbon Cycle Sensitivity to Climate Change: Results from a Comprehensive GCM-Based Climate and Carbon Cycle Model
AU: * Govindasamy, B
EM: bala@llnl.gov
AF: Lawrence Livermore National Laboratory, 7000 East Ave, L-103 , Livermore, CA 94550 United States
AU: Thompson, S L
EM: thompson59@llnl.gov
AF: Lawrence Livermore National Laboratory, 7000 East Ave, L-103 , Livermore, CA 94550 United States
AU: Wickett, M
EM: wickett1@llnl.gov
AF: Lawrence Livermore National Laboratory, 7000 East Ave, L-103 , Livermore, CA 94550 United States
AU: Mirin, A
EM: mirin1@llnl.gov
AF: Lawrence Livermore National Laboratory, 7000 East Ave, L-103 , Livermore, CA 94550 United States
AU: Delire, C
EM: cldelire@facstaff.wisc.edu
AF: Institute des Sciences de'l Evoluation, Universite Montepellier II, NA, NA NA France
AB: We use an interactive global climate and carbon cycle model to perform simulations of climate change from 1870 AD to 2100 AD forced by anthropogenic emissions of greenhouse gases. The goal of this effort is to include and better understand feedbacks between the climate system and the carbon cycle. We use the Parallel Climate Model 2 (PCM-2) developed at NCAR as our climate model. The PCM-2 includes a version of NCAR's CCM3 for the atmospheric GCM and a version of the POP model for the ocean GCM. The ocean carbon model is based on OCMIP protocols, but modified to eliminate the phosphate-restoring restriction. The terrestrial biosphere model is IBIS-2 which simulates biophysical and biogeochemical surface fluxes and includes a dynamic vegetation model. Three simulations are performed using three different IPCC emission scenario: A1B, A2 and B1. These scenarios correspond to moderate, aggressive and low rates of fossil fuel burning in the 21st century. All cases assume historical greenhouse emissions and land use change emissions up to year 2000. The range of emissions rates by year 2100 that force these 3 experiments encompasses the range projected by Third Assessment Report of IPCC. We will discuss the sensitivity of model's carbon cycle for this range of global climate change. We will specifically discuss the sensitivity of terrestrial carbon uptake to changes in the magnitude of global warming.
DE: 1704 Atmospheric sciences
DE: 1600 GLOBAL CHANGE (New category)
DE: 1615 Biogeochemical processes (4805)
DE: 1620 Climate dynamics (3309)
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting