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| Titel |
Climatic impacts of fresh water hosing under Last Glacial Maximum conditions: a multi-model study |
| VerfasserIn |
M. Kageyama, U. Merkel, B. Otto-Bliesner, M. Prange, A. Abe-Ouchi, G. Lohmann, R. Ohgaito, D. M. Roche, J. Singarayer, D. Swingedouw, X. Zhang |
| 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 ; 9, no. 2 ; Nr. 9, no. 2 (2013-04-09), S.935-953 |
| Datensatznummer |
250018029
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| Publikation (Nr.) |
 copernicus.org/cp-9-935-2013.pdf |
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| Zusammenfassung |
| Fresh water hosing simulations, in which a fresh water flux is
imposed in the North Atlantic to force fluctuations of the Atlantic
Meridional Overturning Circulation, have been routinely performed,
first to study the climatic signature of different states of this
circulation, then, under present or future conditions, to
investigate the potential impact of a partial melting of the
Greenland ice sheet. The most compelling examples of climatic
changes potentially related to AMOC abrupt variations, however, are
found in high resolution palaeo-records from around the globe for
the last glacial period. To study those more specifically, more and
more fresh water hosing experiments have been performed under
glacial conditions in the recent years. Here we compare an ensemble
constituted by 11 such simulations run with 6 different climate
models. All simulations follow a slightly different design, but are
sufficiently close in their design to be compared. They all study the
impact of a fresh water hosing imposed in the extra-tropical North
Atlantic. Common features in the model responses to hosing are the
cooling over the North Atlantic, extending along the sub-tropical
gyre in the tropical North Atlantic, the southward shift of the
Atlantic ITCZ and the weakening of the African and Indian
monsoons. On the other hand, the expression of the bipolar see-saw,
i.e., warming in the Southern Hemisphere, differs from model to
model, with some restricting it to the South Atlantic and specific
regions of the southern ocean while others simulate a widespread
southern ocean warming. The relationships between the features
common to most models, i.e., climate changes over the north and
tropical Atlantic, African and Asian monsoon regions, are further
quantified. These suggest a tight correlation between the
temperature and precipitation changes over the extra-tropical North
Atlantic, but different pathways for the teleconnections between the
AMOC/North Atlantic region and the African and Indian monsoon
regions. |
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