Climatic impacts of fresh water hosing under Last Glacial Maximum conditions: a multi-model study
Fresh water hosing simulations, in which a fresh water flux is imposed in the North Atlantic to force fluctuations of the Atlantic Meridional Overturning Circulation, have been routinely performed, first to study the climatic signature of different states of this circulation, then, under present or...
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ftdoajarticles:oai:doaj.org/article:5f68923a22bd42d3be119ec070b149e6 2023-05-15T16:30:17+02:00 Climatic impacts of fresh water hosing under Last Glacial Maximum conditions: a multi-model study M. Kageyama U. Merkel B. Otto-Bliesner M. Prange A. Abe-Ouchi G. Lohmann R. Ohgaito D. M. Roche J. Singarayer D. Swingedouw X Zhang 2013-04-01T00:00:00Z https://doi.org/10.5194/cp-9-935-2013 https://doaj.org/article/5f68923a22bd42d3be119ec070b149e6 EN eng Copernicus Publications http://www.clim-past.net/9/935/2013/cp-9-935-2013.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-9-935-2013 1814-9324 1814-9332 https://doaj.org/article/5f68923a22bd42d3be119ec070b149e6 Climate of the Past, Vol 9, Iss 2, Pp 935-953 (2013) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2013 ftdoajarticles https://doi.org/10.5194/cp-9-935-2013 2022-12-31T02:47:42Z Fresh water hosing simulations, in which a fresh water flux is imposed in the North Atlantic to force fluctuations of the Atlantic Meridional Overturning Circulation, have been routinely performed, first to study the climatic signature of different states of this circulation, then, under present or future conditions, to investigate the potential impact of a partial melting of the Greenland ice sheet. The most compelling examples of climatic changes potentially related to AMOC abrupt variations, however, are found in high resolution palaeo-records from around the globe for the last glacial period. To study those more specifically, more and more fresh water hosing experiments have been performed under glacial conditions in the recent years. Here we compare an ensemble constituted by 11 such simulations run with 6 different climate models. All simulations follow a slightly different design, but are sufficiently close in their design to be compared. They all study the impact of a fresh water hosing imposed in the extra-tropical North Atlantic. Common features in the model responses to hosing are the cooling over the North Atlantic, extending along the sub-tropical gyre in the tropical North Atlantic, the southward shift of the Atlantic ITCZ and the weakening of the African and Indian monsoons. On the other hand, the expression of the bipolar see-saw, i.e., warming in the Southern Hemisphere, differs from model to model, with some restricting it to the South Atlantic and specific regions of the southern ocean while others simulate a widespread southern ocean warming. The relationships between the features common to most models, i.e., climate changes over the north and tropical Atlantic, African and Asian monsoon regions, are further quantified. These suggest a tight correlation between the temperature and precipitation changes over the extra-tropical North Atlantic, but different pathways for the teleconnections between the AMOC/North Atlantic region and the African and Indian monsoon regions. Article in Journal/Newspaper Greenland Ice Sheet North Atlantic Southern Ocean Directory of Open Access Journals: DOAJ Articles Greenland Indian Southern Ocean Climate of the Past 9 2 935 953 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 M. Kageyama U. Merkel B. Otto-Bliesner M. Prange A. Abe-Ouchi G. Lohmann R. Ohgaito D. M. Roche J. Singarayer D. Swingedouw X Zhang Climatic impacts of fresh water hosing under Last Glacial Maximum conditions: a multi-model study |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Fresh water hosing simulations, in which a fresh water flux is imposed in the North Atlantic to force fluctuations of the Atlantic Meridional Overturning Circulation, have been routinely performed, first to study the climatic signature of different states of this circulation, then, under present or future conditions, to investigate the potential impact of a partial melting of the Greenland ice sheet. The most compelling examples of climatic changes potentially related to AMOC abrupt variations, however, are found in high resolution palaeo-records from around the globe for the last glacial period. To study those more specifically, more and more fresh water hosing experiments have been performed under glacial conditions in the recent years. Here we compare an ensemble constituted by 11 such simulations run with 6 different climate models. All simulations follow a slightly different design, but are sufficiently close in their design to be compared. They all study the impact of a fresh water hosing imposed in the extra-tropical North Atlantic. Common features in the model responses to hosing are the cooling over the North Atlantic, extending along the sub-tropical gyre in the tropical North Atlantic, the southward shift of the Atlantic ITCZ and the weakening of the African and Indian monsoons. On the other hand, the expression of the bipolar see-saw, i.e., warming in the Southern Hemisphere, differs from model to model, with some restricting it to the South Atlantic and specific regions of the southern ocean while others simulate a widespread southern ocean warming. The relationships between the features common to most models, i.e., climate changes over the north and tropical Atlantic, African and Asian monsoon regions, are further quantified. These suggest a tight correlation between the temperature and precipitation changes over the extra-tropical North Atlantic, but different pathways for the teleconnections between the AMOC/North Atlantic region and the African and Indian monsoon regions. |
format |
Article in Journal/Newspaper |
author |
M. Kageyama U. Merkel B. Otto-Bliesner M. Prange A. Abe-Ouchi G. Lohmann R. Ohgaito D. M. Roche J. Singarayer D. Swingedouw X Zhang |
author_facet |
M. Kageyama U. Merkel B. Otto-Bliesner M. Prange A. Abe-Ouchi G. Lohmann R. Ohgaito D. M. Roche J. Singarayer D. Swingedouw X Zhang |
author_sort |
M. Kageyama |
title |
Climatic impacts of fresh water hosing under Last Glacial Maximum conditions: a multi-model study |
title_short |
Climatic impacts of fresh water hosing under Last Glacial Maximum conditions: a multi-model study |
title_full |
Climatic impacts of fresh water hosing under Last Glacial Maximum conditions: a multi-model study |
title_fullStr |
Climatic impacts of fresh water hosing under Last Glacial Maximum conditions: a multi-model study |
title_full_unstemmed |
Climatic impacts of fresh water hosing under Last Glacial Maximum conditions: a multi-model study |
title_sort |
climatic impacts of fresh water hosing under last glacial maximum conditions: a multi-model study |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/cp-9-935-2013 https://doaj.org/article/5f68923a22bd42d3be119ec070b149e6 |
geographic |
Greenland Indian Southern Ocean |
geographic_facet |
Greenland Indian Southern Ocean |
genre |
Greenland Ice Sheet North Atlantic Southern Ocean |
genre_facet |
Greenland Ice Sheet North Atlantic Southern Ocean |
op_source |
Climate of the Past, Vol 9, Iss 2, Pp 935-953 (2013) |
op_relation |
http://www.clim-past.net/9/935/2013/cp-9-935-2013.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-9-935-2013 1814-9324 1814-9332 https://doaj.org/article/5f68923a22bd42d3be119ec070b149e6 |
op_doi |
https://doi.org/10.5194/cp-9-935-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
container_issue |
2 |
container_start_page |
935 |
op_container_end_page |
953 |
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1766020004936941568 |