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| Titel |
The effect of Arctic sea-ice extent on the absorbed (net) solar flux at the surface, based on ISCCP-D2 cloud data for 1983–2007 |
| VerfasserIn |
C. Matsoukas, N. Hatzianastassiou, A. Fotiadi, K. G. Pavlakis, I. Vardavas |
| 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 ; 10, no. 2 ; Nr. 10, no. 2 (2010-01-26), S.777-787 |
| Datensatznummer |
250007975
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| Publikation (Nr.) |
 copernicus.org/acp-10-777-2010.pdf |
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| Zusammenfassung |
| We estimate the effect of the Arctic sea ice on the absorbed (net) solar
flux using a radiative transfer model. Ice and cloud input data to the
model come from satellite observations, processed by the International
Satellite Cloud Climatology Project (ISCCP) and span the period July 1983–June
2007. The sea-ice effect on the solar radiation fluctuates seasonally with the
solar flux and decreases interannually in synchronisation with the decreasing
sea-ice extent. A disappearance of the Arctic ice cap during the sunlit period
of the year would radically reduce the local albedo and cause an annually averaged
19.7 W m−2 increase in absorbed solar flux at the Arctic Ocean surface,
or equivalently an annually averaged 0.55 W m−2 increase on the
planetary scale. In the clear-sky scenario these numbers increase to 34.9 and
0.97 W m−2, respectively. A meltdown only in September, with all
other months unaffected, increases the Arctic annually averaged solar absorption
by 0.32 W m−2. We examined the net solar flux trends for the Arctic
Ocean and found that the areas absorbing the solar flux more rapidly are the
North Chukchi and Kara Seas, Baffin and Hudson Bays, and Davis Strait. The
sensitivity of the Arctic absorbed solar flux on sea-ice extent and cloud
amount was assessed. Although sea ice and cloud affect jointly the solar flux,
we found little evidence of strong non-linearities. |
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