HR: 0830h
AN: A31D-0074    [PDF]
TI: Airborne Measurements of Halocarbons During the 2003 COBRA - North America Study
AU: * Hurst, D
EM: Dale.Hurst@noaa.gov
AF: CIRES, University of Colorado, Campus Box 216, Boulder, CO 80309 United States
AU: * Hurst, D
EM: Dale.Hurst@noaa.gov
AF: NOAA Climate Monitoring and Diagnostics Laboratory, 325 Broadway R/CMDL1, Boulder, CO 80305 United States
AU: Romashkin, P
EM: Pavel.Romashkin@noaa.gov
AF: CIRES, University of Colorado, Campus Box 216, Boulder, CO 80309 United States
AU: Romashkin, P
EM: Pavel.Romashkin@noaa.gov
AF: NOAA Climate Monitoring and Diagnostics Laboratory, 325 Broadway R/CMDL1, Boulder, CO 80305 United States
AU: Daube, B
EM: Bruce.Daube@noaa.gov
AF: CIRES, University of Colorado, Campus Box 216, Boulder, CO 80309 United States
AU: Daube, B
EM: Bruce.Daube@noaa.gov
AF: NOAA Climate Monitoring and Diagnostics Laboratory, 325 Broadway R/CMDL1, Boulder, CO 80305 United States
AU: Elkins, J
EM: James.W.Elkins@noaa.gov
AF: NOAA Climate Monitoring and Diagnostics Laboratory, 325 Broadway R/CMDL1, Boulder, CO 80305 United States
AU: Gerbig, C
EM: chg@io.harvard.edu
AF: Harvard University, Department of Earth and Planetary Sciences, 20 Oxford Street, Cambridge, MA 02138 United States
AU: Lin, J
EM: johnlin@fas.harvard.edu
AF: Harvard University, Department of Earth and Planetary Sciences, 20 Oxford Street, Cambridge, MA 02138 United States
AU: Matross, D
EM: matross@fas.harvard.edu
AF: Harvard University, Department of Earth and Planetary Sciences, 20 Oxford Street, Cambridge, MA 02138 United States
AU: Wofsy, S
EM: wofsy@fas.harvard.edu
AF: Harvard University, Department of Earth and Planetary Sciences, 20 Oxford Street, Cambridge, MA 02138 United States
AB: During May and June 2003, we made thousands of in situ measurements of seven halocarbons (CFC-11, CFC-12, CFC-113, CH$_{3}$CCl$_{3}$, CCl$_{4}$, CBrClF$_{2}$, and CHCl$_{3}$) and other important atmospheric gases in the boundary layer and free troposphere over the USA and Canada as part of the 2003 CO$_{2}$ Budget and Regional Airborne - North America (COBRA-NA 2003) study. Our goal was to compile a geographically extensive set of mixing ratio data for these gases from which their emissions could be determined at the regional to continental scale. Two 11,000 km racetracks around the USA and Canada were completed during this study, along with several regional flights in the northeastern and southern central USA. Our interest in quantifying contemporary halocarbon emissions in the USA and Canada stems from the prohibited production and consumption of these ozone-depleting substances in developed countries, as mandated by the Montreal Protocol for Substances that Deplete the Ozone Layer and its Amendments. Developed countries in compliance with the Protocol have not produced the halocarbons we measured (excluding CHCl$_{3}$) since before 1996, yet modern emissions persist from reservoirs (banks) of these chemicals. Halocarbon emissions in developed nations are increasingly difficult to estimate because their once ubiquitous sources have diminished, both in magnitude and spatial uniformity, limiting the accuracy of regional and continental-scale emission estimates derived from localized measurements. Our broad-ranging data set for the USA and Canada lead to improved estimates of large-scale halocarbon emissions in these countries.
UR: http://www.fas.harvard.edu/~cobra
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting