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| Titel |
Wavelet analysis of the singular spectral reconstructed time series to study the imprints of Solar–ENSO–Geomagnetic activity on Indian climate |
| VerfasserIn |
S. Sri Lakshmi, R. K. Tiwari |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2198-5634
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics Discussions ; 2, no. 5 ; Nr. 2, no. 5 (2015-09-28), S.1447-1479 |
| Datensatznummer |
250115197
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| Publikation (Nr.) |
 copernicus.org/npgd-2-1447-2015.pdf |
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| Zusammenfassung |
| In order to study the imprints of solar–ENSO–geomagnetic activity on
the Indian Subcontinent, we have applied the Singular Spectral
Analysis (SSA) and wavelet analysis to the tree ring temperature
variability record from the western Himalayas. The data used in the
present study are the Solar Sunspot Number (SSN), Geomagnetic Indices
(aa Index), Southern Oscillation Index (SOI) and tree ring temperature
record from western Himalayas (WH), for the period of 1876–2000. The
SSA and wavelet spectra reveal the presence of 5 years short
term ENSO variations to 11 year solar cycle indicating the
influence of both the solar–geomagnetic and ENSO imprints in the tree
ring data. The presence of 33-year cycle periodicity suggests the
Sun-temperature variability probably involving the induced changes in
the basic state of the atmosphere. Our wavelet analysis for the SSA
reconstructed time series agrees with our previous results and also
enhance the amplitude of the signals by removing the noise and showing
a strong influence of solar–geomagnetic and ENSO patterns throughout
the record. The solar flares are considered to be responsible for
cause in the circulation patterns in the atmosphere. The net effect of
solar–geomagnetic processes on temperature record thus appears to be
the result of counteracting influences on shorter (about 5–6 years) and
longer (about 11–12 years) time scales. The present analysis thus
suggests that the influence of solar processes on Indian temperature
variability operates in part indirectly through ENSO, but on more than
one time scale. The analyses hence provides credible evidence for
teleconnections of tropical pacific climatic variability with Indian
climate ranging from interannual-decadal time scales and also
demonstrate the possible role of exogenic triggering in reorganizing
the global earth–ocean–atmospheric systems. |
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