Glacial fluctuations of the Indian monsoon and their relationship with North Atlantic climate: new data and modelling experiments
International audience Several paleoclimate records such as from Chinese loess, speleothems or upwelling indicators in marine sediments present large variations of the Asian monsoon system during the last glaciation. Here, we present a new record from the northern Andaman Sea (core MD77-176) which s...
Published in: | Climate of the Past |
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Main Authors: | , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2013
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Online Access: | https://hal.science/hal-02931580 https://hal.science/hal-02931580/document https://hal.science/hal-02931580/file/cp-9-2135-2013.pdf https://doi.org/10.5194/cp-9-2135-2013 |
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Open Polar |
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Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
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English |
topic |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Marzin, C. Kallel, N. Kageyama, M. Duplessy, J.-C. Braconnot, P. Glacial fluctuations of the Indian monsoon and their relationship with North Atlantic climate: new data and modelling experiments |
topic_facet |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Several paleoclimate records such as from Chinese loess, speleothems or upwelling indicators in marine sediments present large variations of the Asian monsoon system during the last glaciation. Here, we present a new record from the northern Andaman Sea (core MD77-176) which shows the variations of the hydrological cycle of the Bay of Bengal. The high-resolution record of surface water δ18O dominantly reflects salinity changes and displays large millennial-scale oscillations over the period 40 000 to 11 000 yr BP. Their timing and sequence suggests that events of high (resp. low) salinity in the Bay of Bengal, i.e. weak (resp. strong) Indian monsoon, correspond to cold (resp. warm) events in the North Atlantic and Arctic, as documented by the Greenland ice core record. We use the IPSL_CM4 Atmosphere-Ocean coupled General Circulation Model to study the processes that could explain the teleconnection between the Indian monsoon and the North Atlantic climate. We first analyse a numerical experiment in which such a rapid event in the North Atlantic is obtained under glacial conditions by increasing the freshwater flux in the North Atlantic, which results in a reduction of the intensity of the Atlantic meridional overturning circulation. This freshwater hosing results in a weakening of the Indian monsoon rainfall and circulation. The changes in the continental runoff and local hydrological cycle are responsible for an increase in salinity in the Bay of Bengal. This therefore compares favourably with the new sea water δ18O record presented here and the hypothesis of synchronous cold North Atlantic and weak Indian monsoon events. Additional sensitivity experiments are produced with the LMDZ atmospheric model to analyse the teleconnection mechanisms between the North Atlantic and the Indian monsoon. The changes over the tropical Atlantic are shown to be essential in triggering perturbations of the subtropical jet over Africa and Eurasia, that in turn affect the intensity of the Indian monsoon. ... |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Unité GEOGLOB Faculté des Sciences de Sfax (FSS) Université de Sfax - University of Sfax-Université de Sfax - University of Sfax Modélisation du climat (CLIM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Modelling the Earth Response to Multiple Anthropogenic Interactions and Dynamics (MERMAID) The publication of this article is financed by CNRS-INSU |
format |
Article in Journal/Newspaper |
author |
Marzin, C. Kallel, N. Kageyama, M. Duplessy, J.-C. Braconnot, P. |
author_facet |
Marzin, C. Kallel, N. Kageyama, M. Duplessy, J.-C. Braconnot, P. |
author_sort |
Marzin, C. |
title |
Glacial fluctuations of the Indian monsoon and their relationship with North Atlantic climate: new data and modelling experiments |
title_short |
Glacial fluctuations of the Indian monsoon and their relationship with North Atlantic climate: new data and modelling experiments |
title_full |
Glacial fluctuations of the Indian monsoon and their relationship with North Atlantic climate: new data and modelling experiments |
title_fullStr |
Glacial fluctuations of the Indian monsoon and their relationship with North Atlantic climate: new data and modelling experiments |
title_full_unstemmed |
Glacial fluctuations of the Indian monsoon and their relationship with North Atlantic climate: new data and modelling experiments |
title_sort |
glacial fluctuations of the indian monsoon and their relationship with north atlantic climate: new data and modelling experiments |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.science/hal-02931580 https://hal.science/hal-02931580/document https://hal.science/hal-02931580/file/cp-9-2135-2013.pdf https://doi.org/10.5194/cp-9-2135-2013 |
genre |
Arctic Greenland Greenland ice core ice core North Atlantic |
genre_facet |
Arctic Greenland Greenland ice core ice core North Atlantic |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-02931580 Climate of the Past, 2013, 9 (5), pp.2135-2151. ⟨10.5194/cp-9-2135-2013⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-9-2135-2013 hal-02931580 https://hal.science/hal-02931580 https://hal.science/hal-02931580/document https://hal.science/hal-02931580/file/cp-9-2135-2013.pdf doi:10.5194/cp-9-2135-2013 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-9-2135-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
container_issue |
5 |
container_start_page |
2135 |
op_container_end_page |
2151 |
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1797579296837992448 |
spelling |
ftuniversailles:oai:HAL:hal-02931580v1 2024-04-28T08:12:26+00:00 Glacial fluctuations of the Indian monsoon and their relationship with North Atlantic climate: new data and modelling experiments Marzin, C. Kallel, N. Kageyama, M. Duplessy, J.-C. Braconnot, P. Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Unité GEOGLOB Faculté des Sciences de Sfax (FSS) Université de Sfax - University of Sfax-Université de Sfax - University of Sfax Modélisation du climat (CLIM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Modelling the Earth Response to Multiple Anthropogenic Interactions and Dynamics (MERMAID) The publication of this article is financed by CNRS-INSU 2013 https://hal.science/hal-02931580 https://hal.science/hal-02931580/document https://hal.science/hal-02931580/file/cp-9-2135-2013.pdf https://doi.org/10.5194/cp-9-2135-2013 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-9-2135-2013 hal-02931580 https://hal.science/hal-02931580 https://hal.science/hal-02931580/document https://hal.science/hal-02931580/file/cp-9-2135-2013.pdf doi:10.5194/cp-9-2135-2013 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-02931580 Climate of the Past, 2013, 9 (5), pp.2135-2151. ⟨10.5194/cp-9-2135-2013⟩ [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2013 ftuniversailles https://doi.org/10.5194/cp-9-2135-2013 2024-04-04T17:36:58Z International audience Several paleoclimate records such as from Chinese loess, speleothems or upwelling indicators in marine sediments present large variations of the Asian monsoon system during the last glaciation. Here, we present a new record from the northern Andaman Sea (core MD77-176) which shows the variations of the hydrological cycle of the Bay of Bengal. The high-resolution record of surface water δ18O dominantly reflects salinity changes and displays large millennial-scale oscillations over the period 40 000 to 11 000 yr BP. Their timing and sequence suggests that events of high (resp. low) salinity in the Bay of Bengal, i.e. weak (resp. strong) Indian monsoon, correspond to cold (resp. warm) events in the North Atlantic and Arctic, as documented by the Greenland ice core record. We use the IPSL_CM4 Atmosphere-Ocean coupled General Circulation Model to study the processes that could explain the teleconnection between the Indian monsoon and the North Atlantic climate. We first analyse a numerical experiment in which such a rapid event in the North Atlantic is obtained under glacial conditions by increasing the freshwater flux in the North Atlantic, which results in a reduction of the intensity of the Atlantic meridional overturning circulation. This freshwater hosing results in a weakening of the Indian monsoon rainfall and circulation. The changes in the continental runoff and local hydrological cycle are responsible for an increase in salinity in the Bay of Bengal. This therefore compares favourably with the new sea water δ18O record presented here and the hypothesis of synchronous cold North Atlantic and weak Indian monsoon events. Additional sensitivity experiments are produced with the LMDZ atmospheric model to analyse the teleconnection mechanisms between the North Atlantic and the Indian monsoon. The changes over the tropical Atlantic are shown to be essential in triggering perturbations of the subtropical jet over Africa and Eurasia, that in turn affect the intensity of the Indian monsoon. ... Article in Journal/Newspaper Arctic Greenland Greenland ice core ice core North Atlantic Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ Climate of the Past 9 5 2135 2151 |