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| Titel |
Potential source regions and processes of aerosol in the summer Arctic |
| VerfasserIn |
J. Heintzenberg, C. Leck, P. Tunved |
| 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. 11 ; Nr. 15, no. 11 (2015-06-15), S.6487-6502 |
| Datensatznummer |
250119811
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| Publikation (Nr.) |
 copernicus.org/acp-15-6487-2015.pdf |
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| Zusammenfassung |
| Sub-micrometer particle size distributions measured during four summer
cruises of the Swedish icebreaker Oden 1991, 1996, 2001, and 2008
were combined with dimethyl sulfide gas data, back trajectories, and daily
maps of pack ice cover in order to investigate source areas and aerosol
formation processes of the boundary layer aerosol in the central Arctic. With
a clustering algorithm, potential aerosol source areas were explored.
Clustering of particle size distributions together with back trajectories
delineated five potential source regions and three different aerosol types
that covered most of the Arctic Basin: marine, newly formed and aged
particles over the pack ice. Most of the pack ice area with < 15% of open water under the trajectories exhibited the aged aerosol type
with only one major mode around 40 nm. For newly formed particles to occur,
two conditions had to be fulfilled over the pack ice: the air had spent 10
days while traveling over ever more contiguous ice and had traveled over less than 30%
open water during the last 5 days. Additionally, the air had experienced
more open water (at least twice as much as in the cases of aged aerosol)
during the last 4 days before arrival in heavy ice conditions at
Oden. Thus we hypothesize that these two conditions were essential
factors for the formation of ultrafine particles over the central Arctic pack
ice. In a comparison the Oden data with summer size distribution data
from Alert, Nunavut, and Mt. Zeppelin, Spitsbergen, we confirmed the Oden
findings with respect to particle sources over the central Arctic. Future
more frequent broken-ice or open water patches in summer will spur biological
activity in surface water promoting the formation of biological particles.
Thereby low clouds and fogs and subsequently the surface energy balance and
ice melt may be affected. |
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