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| Titel |
Barents Sea Inflow Shutdown: A New Mechanism for Rapid Climate Changes |
| VerfasserIn |
V. A. Semenov, W. Park, M. Latif |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022956
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| Zusammenfassung |
| A new mechanism for rapid climate transitions in the high latitudes is described which involves complex ocean-sea ice-atmosphere interactions. A shutdown of the Barents Sea Inflow (BSI) which carries a vast amount of heat into the Arctic Ocean is at the heart of the mechanism. The BSI shutdown is studied in a multi-millennium integration with a global climate model forced by periodically (1000 yr) varying solar constant (+-2W/m2). A positive feedback exists in the model between the inflow, the sea ice cover, and the atmospheric circulation, and BSI shutdown events are associated with a strong cooling in the northern latitudes and a subsequent rearrangement of the Arctic Ocean surface current system. The results reveal the existence of a bifurcation point in the Arctic climate system and provide a new perspective for understanding rapid climate fluctuations evident in paleo-climate records of the North Atlantic, the Nordic Seas, and Europe. |
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