HR: 1340h
AN: A43C-0064    [Abstracts]
TI: Regional and USA Emissions of Methyl Chloroform and Other Gases Inferred From AGAGE Measurements at Trinidad Head, California Since 1995
AU: * Li, J
EM: ljl@eas.gatech.edu
AF: Georgia Institute of Technology, School of Earth and Atmospheric Sciences , Atlanta, GA 30318 United States
AU: Cunnold, D M
AF: Georgia Institute of Technology, School of Earth and Atmospheric Sciences , Atlanta, GA 30318 United States
AU: Wang, H
AF: Georgia Institute of Technology, School of Earth and Atmospheric Sciences , Atlanta, GA 30318 United States
AU: Weiss, R F
AF: Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093 United States
AU: Miller, B R
AF: Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093 United States
AU: Harth, C
AF: Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093 United States
AU: Salameh, P
AF: Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093 United States
AU: Harris, J M
AF: NOAA, CMDL, Boulder, CO 80305 United States
AB: CH3CCl3, CCl2F2, CCl3F, CCl4, CClF2CCl2F, N2O, CH4 and CHCl3 have been measured 36 times daily at Trinidad Head, California (41N, 124W) since 1995. The effects of regional emissions of these gases are clearly seen in the measurements. Back trajectory calculations show that the pollution events are associated with trajectories over California and the neighboring States. Using a 3D trajectory model and population densities as proxies for the distribution of the emissions, reasonable agreement is found between the emission inventory for CH3CCl3 and the observations. The estimated regional emissions have decreased by factors of approximately 10 and 3 for CH3CCl3 and CCl2F2 respectively. Similar estimates are obtained by considering ratios to methane pollution events and using the gridded methane emission estimates from the EDGAR database. Combining our estimates with those obtained in the Northeastern U.S. by Barnes at al. in 2003, U.S. emissions of CH3CCl3 and other measured halocarbons are further estimated.
DE: 3307 Boundary layer processes
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting