Agnihotri, Rajesh and Dutta, Koushik and Soon, Willie (2011) Temporal derivative of Total Solar Irradiance and anomalous Indian summer monsoon: An empirical evidence for a Sun–climate connection. Journal of Atmospheric and Solar-Terrestrial Physics , 73 (13). pp. 1980-1987. ISSN 1364-6826

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Identifying the pattern of natural climate variability is of immense importance to delineate the effects of anthropogenic climate changes. Global and regional climates are suspected to vary, in unison or with delays, with the Total Solar Irradiance (TSI) at decadal to centennial timescales. Here we show that the Indian summer monsoon rainfall correlates well with the temporal derivative of TSI on multi-decadal timescales. This linkage between the temporal derivative of TSI and the Indian summer monsoon is tested and corroborated both for the instrumental period (1871–2006) and for the last $ 300 years using a speleothem d18O record representing rainfall in southwestern India. Our analyses indicate that anomalous dry periods of the Indian monsoon are mostly coincident with negative TSI derivative. This study thus demonstrates the potential of ‘TSI derivative’ as an important indicator of natural monsoon variability on an interdecadal timescale.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords: Total Solar Irradiance (TSI); Tropical precipitation; Indian monsoon; Temporal derivative of TSI
Subjects: Geochemistry/ Geophysics
Meteorology & Atmospheric Sciences
Depositing User: Mr. Abhishek Yadav
Date Deposited: 11 Oct 2012 12:28
Last Modified: 11 Oct 2012 12:28

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