HR: 11:30h
AN: B42C-05    [Abstracts]
TI: Initial Results From an Integrated Terrestrial Carbon Model for North America: Constraining Process Models with Experiments and Measurements
AU: * Post, W M
EM: postwmiii@ornl.gov
AF: Oak Ridge National Laboratory, Environmental Sciences Division Building 1509, MS-6335, Oak Ridge, TN 37831-6335, United States
AU: King, A W
EM: kingaw@ornl.gov
AF: Oak Ridge National Laboratory, Environmental Sciences Division Building 1509, MS-6335, Oak Ridge, TN 37831-6335, United States
AU: Gu, L
EM: lianhong-gu@ornl.gov
AF: Oak Ridge National Laboratory, Environmental Sciences Division Building 1509, MS-6335, Oak Ridge, TN 37831-6335, United States
AU: Ricciuto, D M
AF: Oak Ridge National Laboratory, Environmental Sciences Division Building 1509, MS-6335, Oak Ridge, TN 37831-6335, United States
AU: Li, S
EM: lish@ornl.gov
AF: Oak Ridge National Laboratory, Environmental Sciences Division Building 1509, MS-6335, Oak Ridge, TN 37831-6335, United States
AU: Yang, B
EM: yangb@ornl.gov
AF: Oak Ridge National Laboratory, Environmental Sciences Division Building 1509, MS-6335, Oak Ridge, TN 37831-6335, United States
AB: To develop finer temporal and spatial resolution terrestrial carbon cycle simulation models must incorporate understanding from experiments, be constrained and validated by observations, and provide robust methods for their extrapolation. The Integrated Terrestrial Carbon Model (ITCM) develops an operational framework in which different aspects of terrestrial carbon processes are integrated to estimate and mechanistically explain current carbon sources and sinks and forecast their future behavior and influence on atmospheric CO2 concentration and climate. Preliminary runs for North America with a one-degree spatial grid and hourly temporal resolution show features that have important implications for the NACP. North America simulations show strong and distinct patterns of CO2 dynamics based on weather patterns associated with ENSO. The cause of this result can be explained by examining the relative response of photosynthesis and heterotrophic soil respiration. Simulations indicate that the large increase in NEP from 1991 to 1992 may be attributed to a reduced rate of decomposition in New England and Great Lakes regions. These preliminary results offer hypotheses to be examined and tested with model-data assimilation at site and regional scales. These model-based bottom-up analyses also need to be confronted with top-down inferences based on fine spatial and temporal resolution atmospheric CO2 concentration measurements.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0428 Carbon cycling (4806)
DE: 0438 Diel, seasonal, and annual cycles (4227)
DE: 0466 Modeling
SC: Biogeosciences [B]
MN: 2007 Fall Meeting