Impact of an acceleration of ice sheet melting on monsoon systems

The study of past climates has demonstrated the occurrence of Heinrich events during which major ice discharges occurred at the polar ice sheet, leading to significant additional sea level rise. Heinrich events strongly influenced the oceanic circulation and global climate. However, standard climate...

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Published in:Earth System Dynamics
Main Authors: A. Chemison, D. Defrance, G. Ramstein, C. Caminade
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2022
Subjects:
Q
Online Access:https://doi.org/10.5194/esd-13-1259-2022
https://doaj.org/article/62d2d5edc381472597b4682d35c5ccba
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spelling ftdoajarticles:oai:doaj.org/article:62d2d5edc381472597b4682d35c5ccba 2023-05-15T14:00:38+02:00 Impact of an acceleration of ice sheet melting on monsoon systems A. Chemison D. Defrance G. Ramstein C. Caminade 2022-08-01T00:00:00Z https://doi.org/10.5194/esd-13-1259-2022 https://doaj.org/article/62d2d5edc381472597b4682d35c5ccba EN eng Copernicus Publications https://esd.copernicus.org/articles/13/1259/2022/esd-13-1259-2022.pdf https://doaj.org/toc/2190-4979 https://doaj.org/toc/2190-4987 doi:10.5194/esd-13-1259-2022 2190-4979 2190-4987 https://doaj.org/article/62d2d5edc381472597b4682d35c5ccba Earth System Dynamics, Vol 13, Pp 1259-1287 (2022) Science Q Geology QE1-996.5 Dynamic and structural geology QE500-639.5 article 2022 ftdoajarticles https://doi.org/10.5194/esd-13-1259-2022 2022-12-30T23:49:53Z The study of past climates has demonstrated the occurrence of Heinrich events during which major ice discharges occurred at the polar ice sheet, leading to significant additional sea level rise. Heinrich events strongly influenced the oceanic circulation and global climate. However, standard climate change scenarios (Representative Concentration Pathways or RCPs) do not consider such potential rapid ice sheet collapse; RCPs only consider the dynamic evolution of greenhouse gas emissions. We carried out water-hosing simulations using the Institute Pierre Simon Laplace global Climate Model (IPSL-CM5A) to simulate a rapid melting of the Greenland and Antarctic ice sheets, equivalent to +1 and +3 m additional sea level rise (SLR). Freshwater inputs were added to the standard RCP8.5 emission scenario over the 21st century. The contribution to the SLR from Greenland or from Antarctic ice sheets has differentiated impacts. The freshwater input in the Antarctic is diluted by the circumpolar current, and its global impact is moderate. Conversely, a rapid melting of the ice sheet in the North Atlantic slows down the Atlantic Meridional Overturning Circulation. This slowdown leads to changes in winds, inter-hemispheric temperature and pressure gradients, resulting in a southward shift of the tropical rain belt over the Atlantic and eastern Pacific region. The American and African monsoons are strongly affected and shift to the south. Changes in the North American monsoon occur later, while changes in the South American monsoon start earlier. The North African monsoon is drier during boreal summer, while the southern African monsoon intensifies during austral summer. Simulated changes were not significant for the Asian and Australian monsoons. Article in Journal/Newspaper Antarc* Antarctic Greenland Ice Sheet North Atlantic Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Austral Greenland Pacific Laplace ENVELOPE(141.467,141.467,-66.782,-66.782) Earth System Dynamics 13 3 1259 1287
institution Open Polar
collection Directory of Open Access Journals: DOAJ Articles
op_collection_id ftdoajarticles
language English
topic Science
Q
Geology
QE1-996.5
Dynamic and structural geology
QE500-639.5
spellingShingle Science
Q
Geology
QE1-996.5
Dynamic and structural geology
QE500-639.5
A. Chemison
D. Defrance
G. Ramstein
C. Caminade
Impact of an acceleration of ice sheet melting on monsoon systems
topic_facet Science
Q
Geology
QE1-996.5
Dynamic and structural geology
QE500-639.5
description The study of past climates has demonstrated the occurrence of Heinrich events during which major ice discharges occurred at the polar ice sheet, leading to significant additional sea level rise. Heinrich events strongly influenced the oceanic circulation and global climate. However, standard climate change scenarios (Representative Concentration Pathways or RCPs) do not consider such potential rapid ice sheet collapse; RCPs only consider the dynamic evolution of greenhouse gas emissions. We carried out water-hosing simulations using the Institute Pierre Simon Laplace global Climate Model (IPSL-CM5A) to simulate a rapid melting of the Greenland and Antarctic ice sheets, equivalent to +1 and +3 m additional sea level rise (SLR). Freshwater inputs were added to the standard RCP8.5 emission scenario over the 21st century. The contribution to the SLR from Greenland or from Antarctic ice sheets has differentiated impacts. The freshwater input in the Antarctic is diluted by the circumpolar current, and its global impact is moderate. Conversely, a rapid melting of the ice sheet in the North Atlantic slows down the Atlantic Meridional Overturning Circulation. This slowdown leads to changes in winds, inter-hemispheric temperature and pressure gradients, resulting in a southward shift of the tropical rain belt over the Atlantic and eastern Pacific region. The American and African monsoons are strongly affected and shift to the south. Changes in the North American monsoon occur later, while changes in the South American monsoon start earlier. The North African monsoon is drier during boreal summer, while the southern African monsoon intensifies during austral summer. Simulated changes were not significant for the Asian and Australian monsoons.
format Article in Journal/Newspaper
author A. Chemison
D. Defrance
G. Ramstein
C. Caminade
author_facet A. Chemison
D. Defrance
G. Ramstein
C. Caminade
author_sort A. Chemison
title Impact of an acceleration of ice sheet melting on monsoon systems
title_short Impact of an acceleration of ice sheet melting on monsoon systems
title_full Impact of an acceleration of ice sheet melting on monsoon systems
title_fullStr Impact of an acceleration of ice sheet melting on monsoon systems
title_full_unstemmed Impact of an acceleration of ice sheet melting on monsoon systems
title_sort impact of an acceleration of ice sheet melting on monsoon systems
publisher Copernicus Publications
publishDate 2022
url https://doi.org/10.5194/esd-13-1259-2022
https://doaj.org/article/62d2d5edc381472597b4682d35c5ccba
long_lat ENVELOPE(141.467,141.467,-66.782,-66.782)
geographic Antarctic
The Antarctic
Austral
Greenland
Pacific
Laplace
geographic_facet Antarctic
The Antarctic
Austral
Greenland
Pacific
Laplace
genre Antarc*
Antarctic
Greenland
Ice Sheet
North Atlantic
genre_facet Antarc*
Antarctic
Greenland
Ice Sheet
North Atlantic
op_source Earth System Dynamics, Vol 13, Pp 1259-1287 (2022)
op_relation https://esd.copernicus.org/articles/13/1259/2022/esd-13-1259-2022.pdf
https://doaj.org/toc/2190-4979
https://doaj.org/toc/2190-4987
doi:10.5194/esd-13-1259-2022
2190-4979
2190-4987
https://doaj.org/article/62d2d5edc381472597b4682d35c5ccba
op_doi https://doi.org/10.5194/esd-13-1259-2022
container_title Earth System Dynamics
container_volume 13
container_issue 3
container_start_page 1259
op_container_end_page 1287
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