HR: 1340h
AN: B43D-1585    [Abstracts]
TI: North American Results From a New Global Atmospheric Inversion
AU: * Butler, M P
EM: mpbutler@met.psu.edu
AF: Pennsylvania State University, Department of Meteorology 503 Walker Building, University Park, PA 16802-5013, United States
AU: Denning, A S
EM: denning@atmos.colostate.edu
AF: Colorado State University, Department of Atmospheric Science, Fort Collins, CO 80523, United States
AU: Davis, K J
EM: davis@meteo.psu.edu
AF: Pennsylvania State University, Department of Meteorology 503 Walker Building, University Park, PA 16802-5013, United States
AU: Kawa, S R
EM: stephan.r.kawa@nasa.gov
AF: NASA Goddard Space Flight Center, Code 613.3, Greenbelt, MD 20771, United States
AB: The objective of this study is to characterize North American carbon flux at regional spatial resolution and monthly temporal resolution to inform our mechanistic understanding of the underlying carbon cycle dynamics. A top- down method is used: a global atmospheric Bayesian synthesis inversion in the TransCom style, with 10 regions in North America (47 land regions and 11 ocean regions globally). We address the problem of sparse measurements in global inversions by complementing the traditional, primarily marine boundary layer, global carbon dioxide measurement network with high-precision, well-calibrated carbon dioxide mixing ratio observations at North American flux towers. Mid-day observations (when the atmospheric boundary layer is likely to be well-mixed at these continental sites) and virtual tall tower estimates of mid-day mid-mixed layer mixing ratios are tested. The method uses the NASA PCTM tracer transport model with Goddard Modeling and Assimilation Office GEOS-4 meteorological fields appropriate to the inversion time period. Forward integrations with the PCTM model support solutions for monthly fluxes for 2001-2003 as well as a monthly mean, cyclostationary, solution covering the same time period. Background fluxes include seasonal fossil fuel emissions and air-sea flux, and interannually- varying seasonal terrestrial biosphere and biomass burning fluxes. Preliminary results from the inversion will be shown.
UR: http://cheas.psu.edu/data/people/mpbutler/AGU2007
DE: 0426 Biosphere/atmosphere interactions (0315)
DE: 0428 Carbon cycling (4806)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting