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| Titel |
First-year sea-ice contact predicts bromine monoxide (BrO) levels at Barrow, Alaska better than potential frost flower contact |
| VerfasserIn |
W. R. Simpson, D. Carlson, G. Hönninger, T. A. Douglas, M. Sturm, D. Perovich, U. Platt |
| 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 ; 7, no. 3 ; Nr. 7, no. 3 (2007-02-09), S.621-627 |
| Datensatznummer |
250004552
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| Publikation (Nr.) |
 copernicus.org/acp-7-621-2007.pdf |
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| Zusammenfassung |
| Reactive halogens are responsible for boundary-layer ozone depletion
and mercury deposition in Polar Regions during springtime. To
investigate the source of reactive halogens in the air arriving at
Barrow, Alaska, we measured BrO, an indicator of reactive halogen
chemistry, and correlated its abundance with airmass histories
derived from meteorological back trajectories and remotely sensed
sea ice properties. The BrO abundance is found to be positively
correlated to first-year sea-ice contact (R2=0.55), and
essentially uncorrelated with potential frost flower (PFF) contact
(R2=0.04). Assuming that PFF accurately predicts frost flowers,
these data indicate that snow and ice contaminated with sea salts on
first-year sea ice is a more probable bromine source than are frost
flowers, for airmasses impacting Barrow, Alaska. Climate-driven
changes in Arctic sea ice are likely to alter frost flower and first
year sea ice prevalence. An accurate understanding of how these sea
ice changes would affect the halogen chemistry of the overlying
atmosphere depends upon understanding the relative roles of frost
flowers and saline snow and ice surfaces as reactive bromine
sources. |
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