HR: 0800h
AN: A21E-0775    [Abstracts]
TI: Quantifying the deep convective flux of CO into tropical upper troposphere: A modeling analysis of Aura-MLS CO Measurements
AU: * Cai, C
EM: Chenxia.Cai@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Livesey, N
EM: livesey@mls.jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Li, Q
EM: Qinbin.Li@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AU: Waters, J
EM: joe@mls.jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, United States
AB: Dramatic enhancement of CO over the Amazon was observed by Aura-Microwave Limb Sounder (MLS) at 147 hPa during September-October 2005. It is known that widespread deep convection in the tropics can efficiently deposit surface biomass burning emissions in the upper troposphere. Using 5-day running averages of MLS CO at 1-day interval, we estimated the convective vertical CO fluxes by subtracting the horizontal flux terms and net chemical production/loss from total CO tendency. Our results suggest that the abrupt enhancement of the 147 hPa CO concentrations over the Amazon is associated with the dramatic increase of deep convective CO fluxes. This conclusion is supported by CO fluxes derived from the GEOS-Chem global 3-D chemistry and transport model results simulated for the same time period. The model is driven by assimilated meteorological data and includes 2005-specific biomass emissions constrained by satellite observations. Model results show consistent spatiotemporal distributions as the MLS-derived CO fluxes. The increase in the deep convective CO fluxes during September-October 2005 are further investigated by examining MODIS fire counts and MLS cloud ice data (ice water content), indicators for the intensity of biomass burning and deep convection, respectively, for the corresponding period. The strength of deep convection during the aforementioned time period is also examined using NCEP convective mass flux.
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting