Diurnal and Seasonal Variation of Alkenes, Halocarbons, and Alkyl Nitrates in the Surface Snowpack at Summit, Greenland

HR: 0800h
AN: A11B-0049 [Abstracts]
TI: Diurnal and Seasonal Variation of Alkenes, Halocarbons, and Alkyl Nitrates in the Surface Snowpack at Summit, Greenland
AU: * Blake, N J
EM: nblake@uci.edu
AF: Department of Chemistry University of California Irvine, 516 Rowland Hall, Irvine, CA 92697-2025 United States
AU: Beyersdorf, A
EM: abeyersd@uci.edu
AF: Department of Chemistry University of California Irvine, 516 Rowland Hall, Irvine, CA 92697-2025 United States
AU: Meinardi, S
EM: smeinard@UCI.EDU
AF: Department of Chemistry University of California Irvine, 516 Rowland Hall, Irvine, CA 92697-2025 United States
AU: Dibb, J E
EM: jack.dibb@unh.edu
AF: Climate Change Research Center Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH 03824 United States
AU: Swanson, A L
EM: aswanson@ucar.edu
AF: Cooperative Institute for Research in Environmental Science, University of Colorado, Boulder, CO 80309 United States
AU: Blake, D R
EM: drblake@uci.edu
AF: Department of Chemistry University of California Irvine, 516 Rowland Hall, Irvine, CA 92697-2025 United States
AU: Rowland, F S
EM: rowland@UCI.EDU
AF: Department of Chemistry University of California Irvine, 516 Rowland Hall, Irvine, CA 92697-2025 United States
AB: We present measurements of alkenes, halocarbons, and alkyl nitrates made at Summit, Greenland ($72\deg$34' N, $38\deg$28' W) as part of a larger project to elucidate the processes that produce and consume HOx radicals within and above sunlit surface snow (or firn) over a wide range of environmental conditions. During the summer of 2003 we observed firn mixing ratios of these gases that are typically a factor of 2 to 10 higher in concentration within the firn air than in the ambient air 1 m above the snow. We compare these findings to repeat measurements made at Summit from March to May 2004 as the site emerges from the dark winter months.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting