HR: 14:55h
AN: A13G-05    [Abstracts]
TI: Sensitivity of Top-Down Estimates of CO Sources to GCTM Transport
AU: * Arellano, A F
EM: arellano@ucar.edu
AF: Atmospheric Chemistry Division, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Hess, P G
EM: hess@ucar.edu
AF: Atmospheric Chemistry Division, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Kasibhatla, P S
EM: psk9@duke.edu
AF: Nicholas School of the Environment and Earth Sciences, Duke University, Box 90328, Durham, NC 27708 United States
AU: Petron, G
EM: gap@ucar.edu
AF: Atmospheric Chemistry Division, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AB: While recent inverse modeling studies have contributed towards the development of robust estimates of CO sources, the persistence of significant discrepancies in these estimates highlights the need to investigate possible methodological biases. Here, we explore the impact of using different forward global chemical transport models (GCTM) on top-down estimates of CO sources inferred from MOPITT CO columns for the April 2000 to March 2001 period. We focus, in particular, on two GCTMs, MOZARTv4 driven by NCEP reanalysis and GEOS-CHEMv5.5 which is driven by GMAO assimilated meteorology. We carry out two separate tagged CO simulations based on the same set of basis functions, prior CO emission inventories, and prescribed OH fields. Following the same Bayesian synthesis inversion for each case, we then look at the effect of model transport on the modeled CO and inferred source estimates. Detailed analysis on posterior error is presented in conjunction with a comparison of model results with NOAA CMDL surface measurements. We further show that this model inter-comparison, albeit limited in scope, provides important information on better characterizing model errors and improving top-down estimates of CO sources.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0322 Constituent sources and sinks
DE: 0368 Troposphere: constituent transport and chemistry
DE: 1610 Atmosphere (0315, 0325)
DE: 3260 Inverse theory
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005