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| Titel |
Volcanic impact on the Atlantic Ocean over the last millennium |
| VerfasserIn |
J. Mignot, M. Khodri, C. Frankignoul, J. Servonnat |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 7, no. 4 ; Nr. 7, no. 4 (2011-12-21), S.1439-1455 |
| Datensatznummer |
250004698
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| Publikation (Nr.) |
 copernicus.org/cp-7-1439-2011.pdf |
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| Zusammenfassung |
| The oceanic response to volcanic eruptions over the last 1000 years is
investigated with a focus on the North Atlantic Ocean, using a fully coupled
AOGCM forced by a realistic time series of volcanic eruptions, total solar
irradiance (TSI) and atmospheric greenhouse gases concentration. The model
simulates little response to TSI variations but a strong and long-lasting
thermal and dynamical oceanic adjustment to volcanic forcing, which is shown
to be a function of the time period of the volcanic eruptions. The thermal
response consists of a fast tropical cooling due to the radiative forcing by
the volcanic eruptions, followed by a penetration of this cooling in the
subtropical ocean interior one to five years after the eruption, and
propagation of the anomalies toward the high latitudes. The oceanic
circulation first adjusts rapidly to low latitude anomalous wind stress
induced by the strong cooling. The Atlantic Meridional Overturning
Circulation (AMOC) shows a significant intensification 5 to 10 years after
the eruptions of the period post-1400 A.D., in response to anomalous
atmospheric momentum forcing, and a slight weakening in the following decade.
In response to the stronger eruptions occurring between 1100 and 1300, the
AMOC shows no intensification and a stronger reduction after 10 years. This
study thus stresses the diversity of AMOC response to volcanic eruptions in
climate models and discusses possible explanations. |
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