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| Titel |
The influence of atmospheric circulation on the mid-Holocene climate of Europe: a data–model comparison |
| VerfasserIn |
A. Mauri, B. A. S. Davis, P. M. Collins, J. O. Kaplan |
| 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 ; 10, no. 5 ; Nr. 10, no. 5 (2014-10-29), S.1925-1938 |
| Datensatznummer |
250117064
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| Publikation (Nr.) |
 copernicus.org/cp-10-1925-2014.pdf |
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| Zusammenfassung |
| The atmospheric circulation is a key area of uncertainty in climate model
simulations of future climate change, especially in mid-latitude regions such
as Europe where atmospheric dynamics have a significant role in climate
variability. It has been proposed that the mid-Holocene was characterized in
Europe by a stronger westerly circulation in winter comparable with a more
positive AO/NAO, and a weaker westerly circulation in summer caused by
anti-cyclonic blocking near Scandinavia. Model simulations indicate at best
only a weakly positive AO/NAO, whilst changes in summer atmospheric
circulation have not been widely investigated. Here we use a new pollen-based
reconstruction of European mid-Holocene climate to investigate the role of
atmospheric circulation in explaining the spatial pattern of seasonal
temperature and precipitation anomalies. We find that the footprint of the
anomalies is entirely consistent with those from modern analogue atmospheric
circulation patterns associated with a strong westerly circulation in winter
(positive AO/NAO) and a weak westerly circulation in summer associated with
anti-cyclonic blocking (positive SCAND). We find little agreement between the
reconstructed anomalies and those from 14 GCMs that performed mid-Holocene
experiments as part of the PMIP3/CMIP5 project, which show a much greater
sensitivity to top-of-the-atmosphere changes in solar insolation. Our
findings are consistent with data–model comparisons on contemporary
timescales that indicate that models underestimate the role of atmospheric
circulation in recent climate change, whilst also highlighting the importance
of atmospheric dynamics in explaining interglacial warming. |
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