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| Titel |
Arctic rapid sea ice loss events in regional coupled climate scenario experiments |
| VerfasserIn |
R. Döscher, T. Koenigk |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 9, no. 2 ; Nr. 9, no. 2 (2013-03-05), S.217-248 |
| Datensatznummer |
250018033
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| Publikation (Nr.) |
 copernicus.org/os-9-217-2013.pdf |
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| Zusammenfassung |
| Rapid sea ice loss events (RILEs) in a mini-ensemble of regional Arctic
coupled climate model scenario experiments are analyzed. Mechanisms of sudden
ice loss are strongly related to atmospheric circulation conditions and
preconditioning by sea ice thinning during the seasons and years before the
event. Clustering of events in time suggests a strong control by large-scale
atmospheric circulation. Anomalous atmospheric circulation is providing warm
air anomalies of up to 5 K and is forcing ice flow, affecting winter ice
growth. Even without a seasonal preconditioning during winter, ice drop
events can be initiated by anomalous inflow of warm air during summer. It is
shown that RILEs can be generated based on atmospheric circulation
changes as a major driving force without major competing mechanisms, other
than occasional longwave effects during spring and summer. Other anomalous
seasonal radiative forcing or short-lived forcers (e.g., soot) play minor
roles or no role at all in our model. RILEs initiated by ocean forcing do not
occur in the model, although cannot be ruled out due to model limitations.
Mechanisms found are qualitatively in line with observations of the 2007
RILE. |
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