HR: 09:45h
AN: B41C-07    [Abstracts]
TI: Modeling Studies of Carbon Cycling at the Tapajos National Forest using the NASA-CASA Ecosystem Model
AU: * Klooster, S
EM: sklooster@mail.arc.nasa.gov
AF: California State University Monterey Bay, NASA/ARC, Seaside, CA 93955 United States
AU: Potter, C
EM: cpotter@mail.arc.nasa.gov
AF: NASA Ames Research Center, Mail Stop 242-4, Moffett Field, CA 94035 United States
AU: Oliveira, R
EM: cosme@cpatu.embrapa.br
AF: Embrapa Amaz“nia Oriental, Tv. Dr. Eneas Pinheiro, Belem, PA 66095 Brazil
AU: Carvalho, C
EM: carvalho@cpatu.embrapa.br
AF: Embrapa Amaz“nia Oriental, Tv. Dr. Eneas Pinheiro, Belem, PA 66095 Brazil
AU: Kramer, M
EM: mkramer@mail.arc.nasa.gov
AF: California State University Monterey Bay, NASA/ARC, Seaside, CA 93955 United States
AB: The NASA-CASA model is being compared to measurements of energy, water, and carbon exchange at Tapajos National Forest (TNF) tower sites. Daily and monthly model estimates of plant water flux and soil water content, ecosystem productivity, biogeochemical processes, trace gas emissions, and net carbon sequestration are evaluated here for prediction errors and seasonal trends. High resolution (less than 1-km) land cover images for 'footprint' areas of LBA tower sites are being used to define ecosystem model estimates and validation of predictions against measured tower fluxes of carbon and water exchange. Initial model results replicate the seasonal patterns in measured NEE fluxes at km 67, and are consistent with the findings that trees in the eastern Amazon are deeply rooted and their carbon fluxes are not highly stressed during relatively dry seasonal periods. Increased woody debris from past disturbance events could increase the CASA model's predicted loss of carbon to the atmosphere (increase NEE flux). Hence, LBA ecosystem models must better account for recent changes in the forest floor and soil carbon pools at tropical forest sites, specifically those related to disturbance.
UR: http://geo.arc.nasa.gov/sge/casa/
DE: 1610 Atmosphere (0315, 0325)
DE: 1615 Biogeochemical processes (4805)
DE: 1620 Climate dynamics (3309)
DE: 1640 Remote sensing
DE: 0315 Biosphere/atmosphere interactions
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting