 |
| Titel |
The early twentieth century warming and winter Arctic sea ice |
| VerfasserIn |
V. A. Semenov, M. Latif |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1994-0416
|
| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 6, no. 6 ; Nr. 6, no. 6 (2012-11-01), S.1231-1237 |
| Datensatznummer |
250003862
|
| Publikation (Nr.) |
 copernicus.org/tc-6-1231-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| The Arctic has featured the strongest surface warming over the globe
during the recent decades, and the temperature increase has been
accompanied by a rapid decline in sea ice extent. However, little is
known about Arctic sea ice change during the early twentieth century
warming (ETCW) during 1920–1940, also a period of a strong surface
warming, both globally and in the Arctic. Here, we investigate the
sensitivity of Arctic winter surface air temperature (SAT) to sea
ice during 1875–2008 by means of simulations with an atmospheric
general circulation model (AGCM) forced by estimates of the observed
sea surface temperature (SST) and sea ice concentration. The Arctic
warming trend since the 1960s is very well reproduced by the model.
In contrast, ETCW in the Arctic is hardly captured. This is
consistent with the fact that the sea ice extent in the forcing data
does not strongly vary during ETCW. AGCM simulations with observed
SST but fixed sea ice reveal a strong dependence of winter SAT on
sea ice extent. In particular, the warming during the recent decades
is strongly underestimated by the model, if the sea ice extent does
not decline and varies only seasonally. This suggests that a
significant reduction of winter Arctic sea ice extent may have also
accompanied the early twentieth century warming, pointing toward an
important link between anomalous sea ice extent and Arctic surface
temperature variability. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|