Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales
The Northern hemispheric circum global teleconnection (CGT) pattern is thought to be maintained by two main forcings—viz-diabatic heating associated with the Indian summer monsoon (ISM) and barotropic instability generation over the jet exit region over the North Atlantic. The CGT and ISM impacts on...
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Online Access: | http://dx.doi.org/10.3389/feart.2022.973468 https://www.frontiersin.org/articles/10.3389/feart.2022.973468/full |
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crfrontiers:10.3389/feart.2022.973468 2024-03-31T07:54:12+00:00 Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales Dutta, Arijeet Neena, J. M. 2022 http://dx.doi.org/10.3389/feart.2022.973468 https://www.frontiersin.org/articles/10.3389/feart.2022.973468/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Earth Science volume 10 ISSN 2296-6463 General Earth and Planetary Sciences journal-article 2022 crfrontiers https://doi.org/10.3389/feart.2022.973468 2024-03-05T00:21:14Z The Northern hemispheric circum global teleconnection (CGT) pattern is thought to be maintained by two main forcings—viz-diabatic heating associated with the Indian summer monsoon (ISM) and barotropic instability generation over the jet exit region over the North Atlantic. The CGT and ISM impacts one another through the circulation responses over West central Asia (WCA). In this study we revisit the CGT-ISM interactions focusing on the WCA region and try to understand whether the downstream impact of CGT on ISM dominates over the ISM feedback on CGT. Analysis indicates that the Atlantic forced CGT responses play a lead role in modulating the ISM in the interannual timescale, by modulating the upper-level anticyclones over WCA and in turn affecting the ISM easterly vertical wind shear. Atlantic multi-decadal oscillation (AMO) is a major driver of ISM variability in the multi-decadal time scale and the AMO is associated with an arching wave-train of teleconnection across Eurasia. Our analysis indicates significant modulation of WCA anomalies by the AMO in the multi-decadal time scale, implying that the Atlantic-CGT-WCA-ISM pathway of teleconnection has a low frequency counterpart. We further demonstrate that the observed out of phase relationship between AMO and ISM in the recent decades, may be attributed to the relatively stronger high latitude warming over the north Atlantic during the recent AMO warm phase. The equivalent barotropic responses to the extra-tropical north Atlantic sea surface temperature (SST) anomalies alter the entire downstream teleconnection pattern producing cyclonic anomalies over WCA and in turn weakening the ISM. Article in Journal/Newspaper North Atlantic Frontiers (Publisher) Indian Frontiers in Earth Science 10 |
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Frontiers (Publisher) |
op_collection_id |
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topic |
General Earth and Planetary Sciences |
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General Earth and Planetary Sciences Dutta, Arijeet Neena, J. M. Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales |
topic_facet |
General Earth and Planetary Sciences |
description |
The Northern hemispheric circum global teleconnection (CGT) pattern is thought to be maintained by two main forcings—viz-diabatic heating associated with the Indian summer monsoon (ISM) and barotropic instability generation over the jet exit region over the North Atlantic. The CGT and ISM impacts one another through the circulation responses over West central Asia (WCA). In this study we revisit the CGT-ISM interactions focusing on the WCA region and try to understand whether the downstream impact of CGT on ISM dominates over the ISM feedback on CGT. Analysis indicates that the Atlantic forced CGT responses play a lead role in modulating the ISM in the interannual timescale, by modulating the upper-level anticyclones over WCA and in turn affecting the ISM easterly vertical wind shear. Atlantic multi-decadal oscillation (AMO) is a major driver of ISM variability in the multi-decadal time scale and the AMO is associated with an arching wave-train of teleconnection across Eurasia. Our analysis indicates significant modulation of WCA anomalies by the AMO in the multi-decadal time scale, implying that the Atlantic-CGT-WCA-ISM pathway of teleconnection has a low frequency counterpart. We further demonstrate that the observed out of phase relationship between AMO and ISM in the recent decades, may be attributed to the relatively stronger high latitude warming over the north Atlantic during the recent AMO warm phase. The equivalent barotropic responses to the extra-tropical north Atlantic sea surface temperature (SST) anomalies alter the entire downstream teleconnection pattern producing cyclonic anomalies over WCA and in turn weakening the ISM. |
format |
Article in Journal/Newspaper |
author |
Dutta, Arijeet Neena, J. M. |
author_facet |
Dutta, Arijeet Neena, J. M. |
author_sort |
Dutta, Arijeet |
title |
Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales |
title_short |
Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales |
title_full |
Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales |
title_fullStr |
Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales |
title_full_unstemmed |
Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales |
title_sort |
exploring the circum-global teleconnection—indian summer monsoon interactions in the interannual and multidecadal timescales |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/feart.2022.973468 https://www.frontiersin.org/articles/10.3389/feart.2022.973468/full |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Frontiers in Earth Science volume 10 ISSN 2296-6463 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/feart.2022.973468 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
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1795034911709593600 |