An investigation of the interaction of carbonyl compounds with the snowpack

被引:59
作者
Couch, TL [1 ]
Sumner, AL
Dassau, TM
Shepson, PB
Honrath, RE
机构
[1] Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA
[2] Purdue Univ, Dept Earth & Atmospher Sci, W Lafayette, IN 47907 USA
[3] Michigan Technol Univ, Dept Civil & Environm Engn, Houghton, MI 49931 USA
关键词
D O I
10.1029/1999GL011288
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
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 similar to 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.
引用
收藏
页码:2241 / 2244
页数:4
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