Evidence for solar forcing on the Indian monsoon during the last millennium

被引：237

作者：

Agnihotri, R ^{[1
]}

Dutta, K ^{[1
]}

Bhushan, R ^{[1
]}

Somayajulu, BLK ^{[1
]}

机构：

[1] Phys Res Lab, Ahmadabad 380009, Gujarat, India

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 2002年 / 198卷 / 3-4期

关键词：

India; monsoons; solar activity; Arabian Sea; productivity; organic carbon;

D O I：

10.1016/S0012-821X(02)00530-7

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Solar influence on the intensity of the Indian monsoon is demonstrated using a sediment core from the eastern Arabian Sea dating back to 1200 yr, through pattern matching as well as spectral analysis of proxy records of monsoon and solar activity. The intensity of the Indian monsoon is found to have decreased during periods of solar minima during the last millennium. Periodicities of 200 20, 105 15 and 60 10 yr are observed in the proxy records coinciding with those known for solar cycles. The similar to60-yr periodicity observed in the instrumental rainfall data appears to be of solar origin and supports the hypothesis of solar control on the Indian monsoon on a multi-decadal time scale. Evidence for the presence of a coupled atmospheric forcing for the Indian and East African monsoons on a centennial time scale is also seen. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：521 / 527

页数：7

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[2]

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