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| Titel |
Frost flower chemical signature in winter snow on Vestfonna ice cap, Nordaustlandet, Svalbard |
| VerfasserIn |
E. Beaudon, J. Moore |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 3, no. 2 ; Nr. 3, no. 2 (2009-07-02), S.147-154 |
| Datensatznummer |
250000933
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| Publikation (Nr.) |
 copernicus.org/tc-3-147-2009.pdf |
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| Zusammenfassung |
| The chemistry of snow and ice cores from Svalbard is influenced by
variations in local sea ice margin and distance to open water. Snow pits
sampled at two summits of Vestfonna ice cap (Nordaustlandet, Svalbard),
exhibit spatially heterogeneous soluble ions concentrations despite similar
accumulation rates, reflecting the importance of small-scale weather
patterns on this island ice cap. The snow pack on the western summit shows
higher average values of marine ions and a winter snow layer that is
relatively depleted in sulphate. One part of the winter snow pack exhibits a
[SO42-/Na+] ratio reduced by two thirds compared with its
ratio in sea water. This low sulphate content in winter snow is interpreted
as the signature of frost flowers, which are formed on young sea ice when
offshore winds predominate. Frost flowers have been described as the
dominant source of sea salt to aerosol and precipitation in ice cores in
coastal Antarctica but this is the first time their chemical signal has been
described in the Arctic. The eastern summit does not show any frost flower
signature and we interpret the unusually dynamic ice transport and rapid
formation of thin ice on the Hinlopen Strait as the source of the frost
flowers. |
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