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| Titel |
The role of blowing snow in the activation of bromine over first-year Antarctic sea ice |
| VerfasserIn |
R. M. Lieb-Lappen, R. W. Obbard |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 13 ; Nr. 15, no. 13 (2015-07-13), S.7537-7545 |
| Datensatznummer |
250119886
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| Publikation (Nr.) |
 copernicus.org/acp-15-7537-2015.pdf |
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| Zusammenfassung |
| It is well known that during polar springtime halide sea salt ions, in
particular Br-, are photochemically activated into reactive halogen
species (e.g., Br and BrO), where they break down tropospheric ozone. This
research investigated the role of blowing snow in transporting salts from the
sea ice/snow surface into reactive bromine species in the air. At two
different locations over first-year ice in the Ross Sea, Antarctica,
collection baskets captured blowing snow at different heights. In addition,
sea ice cores and surface snow samples were collected throughout the
month-long campaign. Over this time, sea ice and surface snow
Br- / Cl- mass ratios remained constant and equivalent to
seawater, and only in lofted snow did bromide become depleted relative to
chloride. This suggests that replenishment of bromide in the snowpack occurs
faster than bromine activation in mid-strength wind conditions (approximately
10 m s−1) or that blowing snow represents only a small portion of
the surface snowpack. Additionally, lofted snow was found to be depleted in
sulfate and enriched in nitrate relative to surface snow. |
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