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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ftdoajarticles:oai:doaj.org/article:68c40faa2e794887bf1883444f4b2d20 2023-05-15T17:29:45+02:00 Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales Arijeet Dutta J. M. Neena 2022-10-01T00:00:00Z https://doi.org/10.3389/feart.2022.973468 https://doaj.org/article/68c40faa2e794887bf1883444f4b2d20 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/feart.2022.973468/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.973468 https://doaj.org/article/68c40faa2e794887bf1883444f4b2d20 Frontiers in Earth Science, Vol 10 (2022) Indian summer monsoon circum-global teleconnection Atlantic multidecadal oscillation multidecadal variability west central Asia Science Q article 2022 ftdoajarticles https://doi.org/10.3389/feart.2022.973468 2022-12-30T23:26:21Z 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 Directory of Open Access Journals: DOAJ Articles Indian Frontiers in Earth Science 10 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Indian summer monsoon circum-global teleconnection Atlantic multidecadal oscillation multidecadal variability west central Asia Science Q |
spellingShingle |
Indian summer monsoon circum-global teleconnection Atlantic multidecadal oscillation multidecadal variability west central Asia Science Q Arijeet Dutta J. M. Neena Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales |
topic_facet |
Indian summer monsoon circum-global teleconnection Atlantic multidecadal oscillation multidecadal variability west central Asia Science Q |
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 |
Arijeet Dutta J. M. Neena |
author_facet |
Arijeet Dutta J. M. Neena |
author_sort |
Arijeet Dutta |
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 S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/feart.2022.973468 https://doaj.org/article/68c40faa2e794887bf1883444f4b2d20 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Frontiers in Earth Science, Vol 10 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/feart.2022.973468/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.973468 https://doaj.org/article/68c40faa2e794887bf1883444f4b2d20 |
op_doi |
https://doi.org/10.3389/feart.2022.973468 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
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1766124545838678016 |