HR: 0830h
AN: A21A-07    [Abstracts]
TI: Assimilation of MOPITT CO Retrievals into the GMAO Constituent Assimilation System
AU: * Tangborn, A
EM: tangborn@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, Code 610.1, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AU: Stajner, I
EM: ivanka@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, Code 610.1, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AU: Pawson, S
EM: spawson@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, Code 610.1, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AU: Nielsen, E
EM: enielsen@gsfc.nasa.gov
AF: Global Modeling and Assimilation Office, Code 610.1, Goddard Space Flight Center, Greenbelt, MD 20771 United States
AU: Jacob, D J
EM: djacob@fas.harvard.edu
AF: Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138 United States
AU: Turquety, S
EM: turquety@fas.harvard.edu
AF: Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138 United States
AB: We present initial results of assimilating weighted column averages of CO data from MOPITT into the GMAO constituent assimilation system. MOPITT is a nadir sounding instrument that makes use of spectrally distinct channels which peak at different altitudes in order to retrieve CO profiles. Associated with the profile retrievals are averaging kernels, which indicate the contribution of each atmospheric layer to the total column CO. This vertical dependence is included in the assimilation by applying the averaging kernels to the background CO field, in order to weight them in a manner consistent with the MOPITT observations. The background fields are provided by an on-line transport calculation in the GEOS-4 General Circulation Model, coupled to a parameterized chemistry module, using production rates and loss frequencies derived from the GEOS-Chem model at Harvard University. Estimates of surface sources of CO are determined daily from space-based observations of biomass burning, along with climatological distributions of fossil-fuel emissions. The focus of the analysis is on the northern summer of 2004, over the period of the Intex-NA field mission, with an examination of the impacts of assimilation on estimates of CO in- and out-flow through the boundaries of North America.
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution--urban and regional (0305)
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2005 Joint Assembly