H2O2 in snow, air and open pore space in firn at Summit, Greenland
Measurements of H2O2 in firn gas down to a 1.7-m depth showed a consistent trend, with higher firn-gas concentrations generally associated with higher concentrations in the firn at the same depth. However, firn to firn-gas concentration ratios still exhibited a seasonal dependence, suggesting that f...
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1995
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ftdatacite:10.48350/158783 2023-05-15T16:29:03+02:00 H2O2 in snow, air and open pore space in firn at Summit, Greenland Bales, Roger C. Losleben, Mark V. McConnell, Joseph R. Fuhrer, Katrin Neftel, Albrecht 1995 https://dx.doi.org/10.48350/158783 https://boris.unibe.ch/158783/ unknown American Geophysical Union open access publisher holds copyright http://purl.org/coar/access_right/c_abf2 530 Physics Text article-journal journal article ScholarlyArticle 1995 ftdatacite https://doi.org/10.48350/158783 2021-11-05T12:55:41Z Measurements of H2O2 in firn gas down to a 1.7-m depth showed a consistent trend, with higher firn-gas concentrations generally associated with higher concentrations in the firn at the same depth. However, firn to firn-gas concentration ratios still exhibited a seasonal dependence, suggesting that for summer layers equilibrium has not yet been reached. The time to reach equilibrium between firn and firn gas is at least weeks. Snowfall and fog deposit several times more H2O2 than the surface snow will retain at equilibrium, supporting the idea that surface snow is a temporary reservoir for H2O2. Thus from an equilibrium standpoint, the snow-pack should be a source of atmospheric H2O2 in the summer as well as fall, resulting in higher daytime concentrations than would occur based on just atmospheric photochemical reactions. But firn-gas measurements reported here were generally near or lower than those in the atmosphere, suggesting that degassing is too slow to significantly influence atmospheric H2O2 levels. Text Greenland DataCite Metadata Store (German National Library of Science and Technology) Greenland |
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unknown |
topic |
530 Physics |
spellingShingle |
530 Physics Bales, Roger C. Losleben, Mark V. McConnell, Joseph R. Fuhrer, Katrin Neftel, Albrecht H2O2 in snow, air and open pore space in firn at Summit, Greenland |
topic_facet |
530 Physics |
description |
Measurements of H2O2 in firn gas down to a 1.7-m depth showed a consistent trend, with higher firn-gas concentrations generally associated with higher concentrations in the firn at the same depth. However, firn to firn-gas concentration ratios still exhibited a seasonal dependence, suggesting that for summer layers equilibrium has not yet been reached. The time to reach equilibrium between firn and firn gas is at least weeks. Snowfall and fog deposit several times more H2O2 than the surface snow will retain at equilibrium, supporting the idea that surface snow is a temporary reservoir for H2O2. Thus from an equilibrium standpoint, the snow-pack should be a source of atmospheric H2O2 in the summer as well as fall, resulting in higher daytime concentrations than would occur based on just atmospheric photochemical reactions. But firn-gas measurements reported here were generally near or lower than those in the atmosphere, suggesting that degassing is too slow to significantly influence atmospheric H2O2 levels. |
format |
Text |
author |
Bales, Roger C. Losleben, Mark V. McConnell, Joseph R. Fuhrer, Katrin Neftel, Albrecht |
author_facet |
Bales, Roger C. Losleben, Mark V. McConnell, Joseph R. Fuhrer, Katrin Neftel, Albrecht |
author_sort |
Bales, Roger C. |
title |
H2O2 in snow, air and open pore space in firn at Summit, Greenland |
title_short |
H2O2 in snow, air and open pore space in firn at Summit, Greenland |
title_full |
H2O2 in snow, air and open pore space in firn at Summit, Greenland |
title_fullStr |
H2O2 in snow, air and open pore space in firn at Summit, Greenland |
title_full_unstemmed |
H2O2 in snow, air and open pore space in firn at Summit, Greenland |
title_sort |
h2o2 in snow, air and open pore space in firn at summit, greenland |
publisher |
American Geophysical Union |
publishDate |
1995 |
url |
https://dx.doi.org/10.48350/158783 https://boris.unibe.ch/158783/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_rights |
open access publisher holds copyright http://purl.org/coar/access_right/c_abf2 |
op_doi |
https://doi.org/10.48350/158783 |
_version_ |
1766018743439196160 |