Physics
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2241c&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 15, p. 2241-2244
Physics
28
Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Hydrology: Glaciology
Scientific paper
Measurements of formaldehyde, acetaldehyde, and acetone in ambient and snowpack air were conducted as a part of the SNOW99 study in northern Michigan. Vertical profiles of ambient and snowpack air illustrate large concentration gradients through the top ~10 cm of the snowpack, implying a positive flux of these species from the surface. Snow chamber experiments that involved flushing a snow-filled 34L Teflon-lined chamber with zero air at 20 slpm indicated that release from the snow followed first order kinetics, with decay constants of 0.19, 0.44, and 0.34 hr-1 for formaldehyde, acetaldehyde, and acetone, respectively. Although it is likely that temperature dependent adsorption/desorption processes play a role, the data are not inconsistent with loss from the snowpack via snow grain metamorphism. The data also imply that formaldehyde is not hydrated in the snow grain surface layer.
Couch Tara Lin
Dassau Terra M.
Honrath Richard E.
Shepson Paul B.
Sumner Ann Louise
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