Presentation1_Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales.PPTX
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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ftfrontimediafig:oai:figshare.com:article/21274422 2023-05-15T17:30:43+02:00 Presentation1_Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales.PPTX Arijeet Dutta J. M. Neena 2022-10-05T04:26:00Z https://doi.org/10.3389/feart.2022.973468.s001 https://figshare.com/articles/presentation/Presentation1_Exploring_the_circum-global_teleconnection_Indian_summer_monsoon_interactions_in_the_interannual_and_multidecadal_timescales_PPTX/21274422 unknown doi:10.3389/feart.2022.973468.s001 https://figshare.com/articles/presentation/Presentation1_Exploring_the_circum-global_teleconnection_Indian_summer_monsoon_interactions_in_the_interannual_and_multidecadal_timescales_PPTX/21274422 CC BY 4.0 CC-BY Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change Indian summer monsoon circum-global teleconnection Atlantic multidecadal oscillation multidecadal variability west central Asia Text Presentation 2022 ftfrontimediafig https://doi.org/10.3389/feart.2022.973468.s001 2022-10-05T23:06:21Z 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. Conference Object North Atlantic Frontiers: Figshare Indian |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change Indian summer monsoon circum-global teleconnection Atlantic multidecadal oscillation multidecadal variability west central Asia |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change Indian summer monsoon circum-global teleconnection Atlantic multidecadal oscillation multidecadal variability west central Asia Arijeet Dutta J. M. Neena Presentation1_Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales.PPTX |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change Indian summer monsoon circum-global teleconnection Atlantic multidecadal oscillation multidecadal variability west central Asia |
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 |
Conference Object |
author |
Arijeet Dutta J. M. Neena |
author_facet |
Arijeet Dutta J. M. Neena |
author_sort |
Arijeet Dutta |
title |
Presentation1_Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales.PPTX |
title_short |
Presentation1_Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales.PPTX |
title_full |
Presentation1_Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales.PPTX |
title_fullStr |
Presentation1_Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales.PPTX |
title_full_unstemmed |
Presentation1_Exploring the circum-global teleconnection—Indian summer monsoon interactions in the interannual and multidecadal timescales.PPTX |
title_sort |
presentation1_exploring the circum-global teleconnection—indian summer monsoon interactions in the interannual and multidecadal timescales.pptx |
publishDate |
2022 |
url |
https://doi.org/10.3389/feart.2022.973468.s001 https://figshare.com/articles/presentation/Presentation1_Exploring_the_circum-global_teleconnection_Indian_summer_monsoon_interactions_in_the_interannual_and_multidecadal_timescales_PPTX/21274422 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
doi:10.3389/feart.2022.973468.s001 https://figshare.com/articles/presentation/Presentation1_Exploring_the_circum-global_teleconnection_Indian_summer_monsoon_interactions_in_the_interannual_and_multidecadal_timescales_PPTX/21274422 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2022.973468.s001 |
_version_ |
1766127608615927808 |