HR: 16:30h
AN: A42F-03    [PDF]
TI: Use of Carbon Isotopes in the Analysis of the Tropospheric Carbon Monoxide Budget
AU: * Emmons, L K
EM: emmons@ucar.edu
AF: National Center for Atmospheric Research, PO Box 3000, Boulder, CO 80307-3000 United States
AU: Hess, P
EM: hess@ucar.edu
AF: National Center for Atmospheric Research, PO Box 3000, Boulder, CO 80307-3000 United States
AU: Lamarque, J
EM: lamar@ucar.edu
AF: National Center for Atmospheric Research, PO Box 3000, Boulder, CO 80307-3000 United States
AU: Mak, J
EM: jemak@notes.cc.sunysb.edu
AF: Stony Brook University, Nicolls Road, Stony Brook, NY 11794-5000 United States
AU: Orlando, J
EM: orlando@ucar.edu
AF: National Center for Atmospheric Research, PO Box 3000, Boulder, CO 80307-3000 United States
AU: Granier, C
EM: claire.granier@aero.jussieu.fr
AF: Service d'Aeronomie, CNRS, Paris, 75252 France
AB: The budget of carbon monoxide (CO) includes emissions from combustion of fossil fuels and biomass, as well as chemical production from the oxidation of methane and higher hydrocarbons, with the primary sink being reaction with OH. The lifetime of CO is on the order of months, so CO serves as a good tracer of pollution long distances from source regions. The CO isotopic signature varies depending on the type of emissions, and thus can provide additional information about the contributions of different emissions. Measurements of $^{13}$CO have been made at a number of locations, showing distinct seasonal and interannual variations. We have added $^{13}$CO and its precursors (CH$_4$ and other hydrocarbons) to the NCAR/MPI/GFDL global chemical transport model MOZART, including the $^{13}$C emissions and fractionation rates, to assist in the interpretation of the $^{13}$CO measurements. The individual emission types have been `tagged' for different regions, to further quantify the CO budget.
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: 2003 Fall Meeting