HR: 1340h
AN: B23A-0936    [Abstracts]
TI: Evaluation of Simulated Atmospheric [CO2] Using Analyzed Climate, Transport and Satellite Vegetation
AU: * Conner Gausepohl, S L
EM: sheri@atmos.colostate.edu
AF: Colorado State University, Department of Atmospheric Science, Fort Collins, CO 80523 United States
AU: Denning, A
EM: denning@atmos.colostate.edu
AF: Colorado State University, Department of Atmospheric Science, Fort Collins, CO 80523 United States
AU: Baker, I
EM: baker@atmos.colostate.edu
AF: Colorado State University, Department of Atmospheric Science, Fort Collins, CO 80523 United States
AU: Gurney, K
EM: keving@atmos.colostate.edu
AF: Colorado State University, Department of Atmospheric Science, Fort Collins, CO 80523 United States
AU: Kleist, J
EM: johnk@atmos.colostate.edu
AF: Colorado State University, Department of Atmospheric Science, Fort Collins, CO 80523 United States
AU: Leonard, O
EM: owen@atmos.colostate.edu
AF: Colorado State University, Department of Atmospheric Science, Fort Collins, CO 80523 United States
AU: Schaefer, K
EM: kevin@atmos.colostate.edu
AF: Colorado State University, Department of Atmospheric Science, Fort Collins, CO 80523 United States
AU: Collatz, J
EM: jcollatz@biome2.gsfc.nasa.gov
AF: Goddard Space Flight Center Code 916, National Aeronautics and Space Administration Greenbelt Road, Greenbelt, MD 20771 United States
AU: Kawa, S
EM: kawa@maia.gsfc.nasa.gov
AF: Goddard Space Flight Center Code 916, National Aeronautics and Space Administration Greenbelt Road, Greenbelt, MD 20771 United States
AU: Pawson, S
EM: pawson@gmao.gsfc.nasa.gov
AF: Goddard Space Flight Center Code 916, National Aeronautics and Space Administration Greenbelt Road, Greenbelt, MD 20771 United States
AU: Zhu, Z
EM: zhu@mulan.gsfc.nasa.gov
AF: Goddard Space Flight Center Code 916, National Aeronautics and Space Administration Greenbelt Road, Greenbelt, MD 20771 United States
AU: Andrews, A
EM: Arlyn.Andrews@noaa.gov
AF: NOAA Climate Monitoring and Diagnostics Laboratory, 325 Broadway, Boulder, CO 80305 United States
AB: We have simulated an hourly global atmospheric [CO2] field for the year 2000 with dual goals of gaining insight into the underlying mechanisms, as well as generating a global [CO2] field with associated uncertainties in order to provide a realistic lateral boundary condition field for regional model simulations and diurnally-varying priors to improve the performance of inversion studies. For our simulations, we are running Colorado State University's Simple Biosphere Model (SiB), versions 2.5 and 3.0, and Goddard Space Flight Center's Parameterized Chemical Transport Model (PCTM) in a step-wise coupled fashion, both driven by assimilated meteorological fields from the NASA Goddard - EOS Data Assimilation System (GEOS - 4), for the year 2000. Comparing the resulting [CO2] and CO2 flux field outputs with observations taken from flasks, continuous analyzers and aircraft campaigns (e.g., COBRA), we are diagnosing model strengths and weaknesses on various spatial and temporal scales. In addition, we are evaluating planetary boundary layer mixing, as this critical component of atmospheric transport and CO2 measurement is likely to be an important consideration in understanding the models' performance. By carefully considering these strengths and weaknesses together with driver data accuracy and "background flux" limitations (such as static fossil fuel emissions field for 1990), we are gaining insight into the underlying mechanisms as well as generating a global [CO2] field with associated uncertainties for use in regional model simulations and inversion studies. Note that by using surface meteorology from a self-consistent source (GEOS - 4) to drive biosphere CO2 fluxes, winds, planetary boundary layer turbulence and convective transport, we are allowing the models to "act in concert", as both CO2 flux and transport are influenced by identical forcings.
DE: 3322 Land/atmosphere interactions
DE: 3337 Numerical modeling and data assimilation
DE: 3210 Modeling
DE: 0315 Biosphere/atmosphere interactions
DE: 0368 Troposphere--constituent transport and chemistry
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting