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| Titel |
Interannual variability of United States cloudiness |
| VerfasserIn |
R. P. Kane, D. Gobbi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 13, no. 6 ; Nr. 13, no. 6, S.660-665 |
| Datensatznummer |
250011888
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| Publikation (Nr.) |
 copernicus.org/angeo-13-660-1995.pdf |
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| Zusammenfassung |
| United States cloudiness data for 1950–1992
show quasi-biennial (QBO) and quasi-triennial (QTO) oscillations which match
partly with the QBO and QTO of the Southern Oscillation (SO) index (the Tahiti
minus Darwin pressure), but not with the QBO of the 50-mb equatorial zonal wind.
Cloudiness also shows significant periodicities near 4.2 and 7.5 years, and
probably a sunspot cycle effect (periodicities 11–14 years), with minimum
cloudiness at or soon after sunspot minima, though this could also be due to
periodicities of 10 and 17 years observed in the SO index. During 1955–1970,
cloudiness increased by about 1%. Thereafter, it remained almost steady for the
eastern and central parts of the USA, but continued to rise until about 1980 for
the western USA. |
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