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| Titel |
Solar cycle signatures in the NCEP equatorial annual oscillation |
| VerfasserIn |
H. G. Mayr, J. G. Mengel, F. T. Huang, E. R. Nash |
| 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 ; 27, no. 8 ; Nr. 27, no. 8 (2009-08-19), S.3225-3235 |
| Datensatznummer |
250016627
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| Publikation (Nr.) |
 copernicus.org/angeo-27-3225-2009.pdf |
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| Zusammenfassung |
| Our analysis of temperature and zonal wind data (1958 to 2006) from the
National Center for Atmospheric Research (NCAR) reanalysis (Re-1), supplied
by the National Centers for Environmental Prediction (NCEP), shows that the
hemispherically symmetric 12-month equatorial annual oscillation (EAO)
contains spectral signatures with periods around 11 years. Moving windows of
44 years show that, below 20 km, the 11-year modulation of the EAO is phase
locked to the solar cycle (SC). The spectral features from the 48-year data
record reveal modulation signatures of 9.6 and 12 years, which produce EAO
variations that mimic in limited altitude regimes the varying maxima and
minima of the 10.7 cm flux solar index. Above 20 km, the spectra also
contain modulation signatures with periods around 11 years, but the filtered
variations are too irregular to suggest that systematic SC forcing is the
principal agent. |
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