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| Titel |
The complex dynamics of the seasonal component of USA's surface temperature |
| VerfasserIn |
A. Vecchio, V. Capparelli, V. Carbone |
| 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. 19 ; Nr. 10, no. 19 (2010-10-11), S.9657-9665 |
| Datensatznummer |
250008825
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| Publikation (Nr.) |
 copernicus.org/acp-10-9657-2010.pdf |
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| Zusammenfassung |
| The dynamics of the climate system has been investigated by analyzing the complex seasonal
oscillation of monthly averaged temperatures recorded at 1167 stations covering the whole
USA. We found the presence of an orbit-climate relationship on time scales remarkably
shorter than the Milankovitch period {related to the nutational forcing}. The relationship
manifests itself through occasional destabilization of the phase of the seasonal component
due to the local changing of balance between direct insolation and the net energy received
by the Earth. Quite surprisingly, we found that the local intermittent dynamics is modulated
by a periodic component of about 18.6 yr due to the nutation of the Earth, which represents the
main modulation of the Earth's precession. The global effect in the last century results in
a cumulative phase-shift of about 1.74 days towards earlier seasons, in agreement with the
phase shift expected from the Earth's precession. The climate dynamics of the seasonal cycle can
be described through a nonlinear circle-map, indicating that the destabilization process can
be associated to intermittent transitions from quasi-periodicity to chaos. |
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