Oscillatory climate modes in the Indian Monsoon, North Atlantic, and Tropical Pacific
This paper explores the three-way interactions between the Indian monsoon, the North Atlantic, and the tropical Pacific. Four climate records were analyzed: the monsoon rainfall in two Indian regions, the Southern Oscillation index for the tropical Pacific, and the NAO index for the North Atlantic....
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Language: | English |
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ftcdlib:qt0rb5m2xt 2023-05-15T17:29:44+02:00 Oscillatory climate modes in the Indian Monsoon, North Atlantic, and Tropical Pacific Feliks, Y Groth, A Robertson, AW Ghil, M 9528 - 9544 2013-12-01 application/pdf http://www.escholarship.org/uc/item/0rb5m2xt english eng eScholarship, University of California qt0rb5m2xt http://www.escholarship.org/uc/item/0rb5m2xt public Feliks, Y; Groth, A; Robertson, AW; & Ghil, M. (2013). Oscillatory climate modes in the Indian Monsoon, North Atlantic, and Tropical Pacific. Journal of Climate, 26(23), 9528 - 9544. doi:10.1175/JCLI-D-13-00105.1. UCLA: Retrieved from: http://www.escholarship.org/uc/item/0rb5m2xt article 2013 ftcdlib https://doi.org/10.1175/JCLI-D-13-00105.1 2018-07-13T22:53:46Z This paper explores the three-way interactions between the Indian monsoon, the North Atlantic, and the tropical Pacific. Four climate records were analyzed: the monsoon rainfall in two Indian regions, the Southern Oscillation index for the tropical Pacific, and the NAO index for the North Atlantic. The individual records exhibit highly significant oscillatory modes with spectral peaks at 7-8 yr and in the quasi-biennial and quasi-quadrennial bands. The interactions between the three regions were investigated in the light of the synchronization theory of chaotic oscillators. The theory was applied here by combining multichannel singular-spectrum analysis (M-SSA) with a recently introduced varimax rotation of the M-SSA eigenvectors. A key result is that the 7-8-yr and 2.7-yr oscillatory modes in all three regions are synchronized, at least in part. The energy-ratio analysis, as well as time-lag results, suggests that the NAO plays a leading role in the 7-8-yr mode. It was found therewith that the South Asian monsoon is not slaved to forcing from the equatorial Pacific, although it does interact strongly with it. The time-lag analysis pinpointed this to be the case in particular for the quasi-biennial oscillatory modes. Overall, these results confirm that the approach of synchronized oscillators, combined with varimax-rotated M-SSA, is a powerful tool in studying teleconnections between regional climate modes and that it helps identify the mechanisms that operate in various frequency bands. This approach should be readily applicable to ocean modes of variability and to the problems of air-sea interaction as well. © 2013 American Meteorological Society. Article in Journal/Newspaper North Atlantic University of California: eScholarship Indian Pacific Journal of Climate 26 23 9528 9544 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
description |
This paper explores the three-way interactions between the Indian monsoon, the North Atlantic, and the tropical Pacific. Four climate records were analyzed: the monsoon rainfall in two Indian regions, the Southern Oscillation index for the tropical Pacific, and the NAO index for the North Atlantic. The individual records exhibit highly significant oscillatory modes with spectral peaks at 7-8 yr and in the quasi-biennial and quasi-quadrennial bands. The interactions between the three regions were investigated in the light of the synchronization theory of chaotic oscillators. The theory was applied here by combining multichannel singular-spectrum analysis (M-SSA) with a recently introduced varimax rotation of the M-SSA eigenvectors. A key result is that the 7-8-yr and 2.7-yr oscillatory modes in all three regions are synchronized, at least in part. The energy-ratio analysis, as well as time-lag results, suggests that the NAO plays a leading role in the 7-8-yr mode. It was found therewith that the South Asian monsoon is not slaved to forcing from the equatorial Pacific, although it does interact strongly with it. The time-lag analysis pinpointed this to be the case in particular for the quasi-biennial oscillatory modes. Overall, these results confirm that the approach of synchronized oscillators, combined with varimax-rotated M-SSA, is a powerful tool in studying teleconnections between regional climate modes and that it helps identify the mechanisms that operate in various frequency bands. This approach should be readily applicable to ocean modes of variability and to the problems of air-sea interaction as well. © 2013 American Meteorological Society. |
format |
Article in Journal/Newspaper |
author |
Feliks, Y Groth, A Robertson, AW Ghil, M |
spellingShingle |
Feliks, Y Groth, A Robertson, AW Ghil, M Oscillatory climate modes in the Indian Monsoon, North Atlantic, and Tropical Pacific |
author_facet |
Feliks, Y Groth, A Robertson, AW Ghil, M |
author_sort |
Feliks, Y |
title |
Oscillatory climate modes in the Indian Monsoon, North Atlantic, and Tropical Pacific |
title_short |
Oscillatory climate modes in the Indian Monsoon, North Atlantic, and Tropical Pacific |
title_full |
Oscillatory climate modes in the Indian Monsoon, North Atlantic, and Tropical Pacific |
title_fullStr |
Oscillatory climate modes in the Indian Monsoon, North Atlantic, and Tropical Pacific |
title_full_unstemmed |
Oscillatory climate modes in the Indian Monsoon, North Atlantic, and Tropical Pacific |
title_sort |
oscillatory climate modes in the indian monsoon, north atlantic, and tropical pacific |
publisher |
eScholarship, University of California |
publishDate |
2013 |
url |
http://www.escholarship.org/uc/item/0rb5m2xt |
op_coverage |
9528 - 9544 |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Feliks, Y; Groth, A; Robertson, AW; & Ghil, M. (2013). Oscillatory climate modes in the Indian Monsoon, North Atlantic, and Tropical Pacific. Journal of Climate, 26(23), 9528 - 9544. doi:10.1175/JCLI-D-13-00105.1. UCLA: Retrieved from: http://www.escholarship.org/uc/item/0rb5m2xt |
op_relation |
qt0rb5m2xt http://www.escholarship.org/uc/item/0rb5m2xt |
op_rights |
public |
op_doi |
https://doi.org/10.1175/JCLI-D-13-00105.1 |
container_title |
Journal of Climate |
container_volume |
26 |
container_issue |
23 |
container_start_page |
9528 |
op_container_end_page |
9544 |
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1766124519588626432 |