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| Titel |
Influence of the sunspot cycle on the Northern Hemisphere wintertime circulation from long upper-air data sets |
| VerfasserIn |
Y. Brugnara, S. Brönnimann, J. Luterbacher, E. Rozanov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 13 ; Nr. 13, no. 13 (2013-07-03), S.6275-6288 |
| Datensatznummer |
250018733
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| Publikation (Nr.) |
 copernicus.org/acp-13-6275-2013.pdf |
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| Zusammenfassung |
Here we present a study of the 11 yr sunspot cycle's imprint on the
Northern Hemisphere atmospheric circulation, using three recently developed
gridded upper-air data sets that extend back to the early twentieth century.
We find a robust response of the tropospheric late-wintertime circulation to
the sunspot cycle, independent from the data set. This response is
particularly significant over Europe, although results show that it is not
directly related to a North Atlantic Oscillation (NAO) modulation; instead,
it reveals a significant connection to the more meridional Eurasian pattern
(EU). The magnitude of mean seasonal temperature changes over the European
land areas locally exceeds 1 K in the lower troposphere over a sunspot
cycle.
We also analyse surface data to address the question whether the solar
signal over Europe is temporally stable for a longer 250 yr period. The
results increase our confidence in the existence of an influence of the
11 yr cycle on the European climate, but the signal is much weaker in the
first half of the period compared to the second half. The last solar minimum
(2005 to 2010), which was not included in our analysis, shows anomalies that
are consistent with our statistical results for earlier solar minima. |
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