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| Titel |
27-day variation in cloud amount in the Western Pacific warm pool region and relationship to the solar cycle |
| VerfasserIn |
Y. Takahashi, Y. Okazaki, M. Sato, H. Miyahara, K. Sakanoi, P. K. Hong, N. Hoshino |
| 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 ; 10, no. 4 ; Nr. 10, no. 4 (2010-02-15), S.1577-1584 |
| Datensatznummer |
250008103
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| Publikation (Nr.) |
 copernicus.org/acp-10-1577-2010.pdf |
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| Zusammenfassung |
| Although linkages between solar activity and the earth's climate have been
suggested and the 11-year cycle in solar activity evident in sunspot numbers
is the most examined example of periodicity in previous studies, no
quantitative evidence indicating a relationship for tropospheric phenomena
has been found for a short period. Based on FFT analysis for OLR (Outgoing
Longwave Radiation) compared with the F10.7 index, we clearly demonstrate a
27-day variation in the cloud amount in the region of the Western Pacific
warm pool, which is only seen in the maximum years of 11-year solar
activity. The average spectrum in such years also shows an enhancement in
the range of the MJO (Madden-Julian Oscillation) period. Although there
exist some explanations for possible mechanisms, the exact cause is unknown.
Therefore, the proposed connection between 27-day cloud variation and solar
cycle in the WPWP region is still a hypothesis and various kinds of
varification based on other meteorological and solar parameters are strongly
required. |
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