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| Titel |
Atmospheric multidecadal variations in the North Atlantic realm: proxy data, observations, and atmospheric circulation model studies |
| VerfasserIn |
K. Grosfeld, G. Lohmann, N. Rimbu, K. Fraedrich, F. Lunkeit |
| 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 ; 3, no. 1 ; Nr. 3, no. 1 (2007-01-26), S.39-50 |
| Datensatznummer |
250000739
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| Publikation (Nr.) |
 copernicus.org/cp-3-39-2007.pdf |
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| Zusammenfassung |
| We investigate the spatial and temporal characteristics of multidecadal
climate variability in the North Atlantic realm, using observational data,
proxy data and model results. The dominant pattern of multidecadal
variability of SST depicts a monopolar structure in the North Atlantic
during the instrumental period with cold (warm) phases during 1900–1925 and
1970–1990 (1870–1890 and 1940–1960). Two atmospheric general circulation
models of different complexity forced with global SST over the last century
show SLP anomaly patterns from the warm and cold phases of the North
Atlantic similar to the corresponding observed patterns. The analysis of a
sediment core from Cariaco Basin, a coral record from the northern Red Sea,
and a long-term sea level pressure (SLP) reconstruction reveals that the
multidecadal mode of the atmospheric circulation characterizes climate
variability also in the pre-industrial era. The analyses of SLP
reconstruction and proxy data depict a persistent atmospheric mode at least
over the last 300 years, where SLP shows a dipolar structure in response to
monopolar North Atlantic SST, in a similar way as the models' responses do.
The combined analysis of observational and proxy data with model experiments
provides an understanding of multidecadal climate modes during the late Holocene.
The related patterns are useful for the interpretation of proxy data in the North
Atlantic realm. |
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