A physical mechanism for North Atlantic SST influence on the Indian summer monsoon
A link between the Atlantic Multidecadal Oscillation (AMO) and multidecadal variability of the Indian summer monsoon rainfall is unraveled and a long sought physical mechanism linking Atlantic climate and monsoon has been identified. The AMO produces persistent weakening (strengthening) of the merid...
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ftindianacasci:oai:repository.ias.ac.in:23814 2023-05-15T17:27:45+02:00 A physical mechanism for North Atlantic SST influence on the Indian summer monsoon Goswami, Bhupendra Nath Madhusoodanan, M. S. Neema, C. P. Sengupta, D. 2006 application/pdf http://repository.ias.ac.in/23814/ http://repository.ias.ac.in/23814/1/341.pdf http://europa.agu.org/?uri=/journals/gl/gl0602/2005GL024803/2005GL024803.xml&view=article unknown American Geophysical Union http://repository.ias.ac.in/23814/1/341.pdf Goswami, Bhupendra Nath Madhusoodanan, M. S. Neema, C. P. Sengupta, D. (2006) A physical mechanism for North Atlantic SST influence on the Indian summer monsoon Geophysical Research Letters, 33 (2). L02706_1-L02706_4. ISSN 0094-8276 Article PeerReviewed 2006 ftindianacasci 2013-01-20T10:31:34Z A link between the Atlantic Multidecadal Oscillation (AMO) and multidecadal variability of the Indian summer monsoon rainfall is unraveled and a long sought physical mechanism linking Atlantic climate and monsoon has been identified. The AMO produces persistent weakening (strengthening) of the meridional gradient of tropospheric temperature (TT) by setting up negative (positive) TT anomaly over Eurasia during northern late summer/autumn resulting in early (late) withdrawal of the south west monsoon and persistent decrease (increase) of seasonal monsoon rainfall. On inter-annual time scales, strong North Atlantic Oscillation (NAO) or North Annular mode (NAM) influences the monsoon by producing similar TT anomaly over Eurasia. The AMO achieves the interdecadal modulation of the monsoon by modulating the frequency of occurrence of strong NAO/NAM events. This mechanism also provides a basis for explaining the observed teleconnection between North Atlantic temperature and the Asian monsoon in paleoclimatic proxies. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Indian Academy of Sciences: Publication of Fellows Indian |
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Indian Academy of Sciences: Publication of Fellows |
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ftindianacasci |
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description |
A link between the Atlantic Multidecadal Oscillation (AMO) and multidecadal variability of the Indian summer monsoon rainfall is unraveled and a long sought physical mechanism linking Atlantic climate and monsoon has been identified. The AMO produces persistent weakening (strengthening) of the meridional gradient of tropospheric temperature (TT) by setting up negative (positive) TT anomaly over Eurasia during northern late summer/autumn resulting in early (late) withdrawal of the south west monsoon and persistent decrease (increase) of seasonal monsoon rainfall. On inter-annual time scales, strong North Atlantic Oscillation (NAO) or North Annular mode (NAM) influences the monsoon by producing similar TT anomaly over Eurasia. The AMO achieves the interdecadal modulation of the monsoon by modulating the frequency of occurrence of strong NAO/NAM events. This mechanism also provides a basis for explaining the observed teleconnection between North Atlantic temperature and the Asian monsoon in paleoclimatic proxies. |
format |
Article in Journal/Newspaper |
author |
Goswami, Bhupendra Nath Madhusoodanan, M. S. Neema, C. P. Sengupta, D. |
spellingShingle |
Goswami, Bhupendra Nath Madhusoodanan, M. S. Neema, C. P. Sengupta, D. A physical mechanism for North Atlantic SST influence on the Indian summer monsoon |
author_facet |
Goswami, Bhupendra Nath Madhusoodanan, M. S. Neema, C. P. Sengupta, D. |
author_sort |
Goswami, Bhupendra Nath |
title |
A physical mechanism for North Atlantic SST influence on the Indian summer monsoon |
title_short |
A physical mechanism for North Atlantic SST influence on the Indian summer monsoon |
title_full |
A physical mechanism for North Atlantic SST influence on the Indian summer monsoon |
title_fullStr |
A physical mechanism for North Atlantic SST influence on the Indian summer monsoon |
title_full_unstemmed |
A physical mechanism for North Atlantic SST influence on the Indian summer monsoon |
title_sort |
physical mechanism for north atlantic sst influence on the indian summer monsoon |
publisher |
American Geophysical Union |
publishDate |
2006 |
url |
http://repository.ias.ac.in/23814/ http://repository.ias.ac.in/23814/1/341.pdf http://europa.agu.org/?uri=/journals/gl/gl0602/2005GL024803/2005GL024803.xml&view=article |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
http://repository.ias.ac.in/23814/1/341.pdf Goswami, Bhupendra Nath Madhusoodanan, M. S. Neema, C. P. Sengupta, D. (2006) A physical mechanism for North Atlantic SST influence on the Indian summer monsoon Geophysical Research Letters, 33 (2). L02706_1-L02706_4. ISSN 0094-8276 |
_version_ |
1766120032434126848 |