Responses of basal melting of Antarctic ice shelves to the climatic forcing of the last glacial maximum and CO2 doubling
Basal melting of the Antarctic ice shelves is an important factor in determining the stability of the Antarctic ice sheet. This study used the climatic outputs of an atmosphere-ocean general circulation model to force a circumpolar ocean model that resolves ice shelf cavity circulation to investigat...
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ftunivtasmania:oai:eprints.utas.edu.au:26456 2023-05-15T13:31:52+02:00 Responses of basal melting of Antarctic ice shelves to the climatic forcing of the last glacial maximum and CO2 doubling Obase, T Abe-Ouchi, A Kusahara, K Hasumi, H Ohgaito, R 2017 application/pdf https://eprints.utas.edu.au/26456/ https://eprints.utas.edu.au/26456/1/Obase_JC_2017.pdf en eng Amer Meteorological Soc https://eprints.utas.edu.au/26456/1/Obase_JC_2017.pdf Obase, T, Abe-Ouchi, A, Kusahara, K orcid:0000-0003-4067-7959 , Hasumi, H and Ohgaito, R 2017 , 'Responses of basal melting of Antarctic ice shelves to the climatic forcing of the last glacial maximum and CO2 doubling' , Journal of Climate, vol. 30, no. 10 , pp. 3473-3497 , doi:10.1175/JCLI-D-15-0908.1 <http://dx.doi.org/10.1175/JCLI-D-15-0908.1>. Antarctic ice shelf basal melting CO2 Article PeerReviewed 2017 ftunivtasmania https://doi.org/10.1175/JCLI-D-15-0908.1 2021-09-13T22:17:27Z Basal melting of the Antarctic ice shelves is an important factor in determining the stability of the Antarctic ice sheet. This study used the climatic outputs of an atmosphere-ocean general circulation model to force a circumpolar ocean model that resolves ice shelf cavity circulation to investigate the response of Antarctic ice shelf melting to different climatic conditions (i.e., to a doubling of CO2 and to the Last Glacial Maximum conditions). Sensitivity experiments were also conducted to investigate the roles of both surface atmospheric change and changes of oceanic lateral boundary conditions. It was found that the rate of change of basal melt due to climate warming is much greater (by an order of magnitude) than that due to cooling. This is mainly because the intrusion of warm water onto the continental shelves, linked to sea ice production and climate change, is crucial in determining the basal melt rate of many ice shelves. Sensitivity experiments showed that changes of atmospheric heat flux and ocean temperature are both important for warm and cold climates. The offshore wind change, together with atmospheric heat flux change, strongly affected the production of both sea ice and high-density water, preventing warmer water approaching the ice shelves under a colder climate. These results reflect the importance of both water mass formation in the Antarctic shelf seas and subsurface ocean temperature in understanding the long-term response to climate change of the melting of Antarctic ice shelves. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Sea ice University of Tasmania: UTas ePrints Antarctic The Antarctic Journal of Climate 30 10 3473 3497 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
Antarctic ice shelf basal melting CO2 |
spellingShingle |
Antarctic ice shelf basal melting CO2 Obase, T Abe-Ouchi, A Kusahara, K Hasumi, H Ohgaito, R Responses of basal melting of Antarctic ice shelves to the climatic forcing of the last glacial maximum and CO2 doubling |
topic_facet |
Antarctic ice shelf basal melting CO2 |
description |
Basal melting of the Antarctic ice shelves is an important factor in determining the stability of the Antarctic ice sheet. This study used the climatic outputs of an atmosphere-ocean general circulation model to force a circumpolar ocean model that resolves ice shelf cavity circulation to investigate the response of Antarctic ice shelf melting to different climatic conditions (i.e., to a doubling of CO2 and to the Last Glacial Maximum conditions). Sensitivity experiments were also conducted to investigate the roles of both surface atmospheric change and changes of oceanic lateral boundary conditions. It was found that the rate of change of basal melt due to climate warming is much greater (by an order of magnitude) than that due to cooling. This is mainly because the intrusion of warm water onto the continental shelves, linked to sea ice production and climate change, is crucial in determining the basal melt rate of many ice shelves. Sensitivity experiments showed that changes of atmospheric heat flux and ocean temperature are both important for warm and cold climates. The offshore wind change, together with atmospheric heat flux change, strongly affected the production of both sea ice and high-density water, preventing warmer water approaching the ice shelves under a colder climate. These results reflect the importance of both water mass formation in the Antarctic shelf seas and subsurface ocean temperature in understanding the long-term response to climate change of the melting of Antarctic ice shelves. |
format |
Article in Journal/Newspaper |
author |
Obase, T Abe-Ouchi, A Kusahara, K Hasumi, H Ohgaito, R |
author_facet |
Obase, T Abe-Ouchi, A Kusahara, K Hasumi, H Ohgaito, R |
author_sort |
Obase, T |
title |
Responses of basal melting of Antarctic ice shelves to the climatic forcing of the last glacial maximum and CO2 doubling |
title_short |
Responses of basal melting of Antarctic ice shelves to the climatic forcing of the last glacial maximum and CO2 doubling |
title_full |
Responses of basal melting of Antarctic ice shelves to the climatic forcing of the last glacial maximum and CO2 doubling |
title_fullStr |
Responses of basal melting of Antarctic ice shelves to the climatic forcing of the last glacial maximum and CO2 doubling |
title_full_unstemmed |
Responses of basal melting of Antarctic ice shelves to the climatic forcing of the last glacial maximum and CO2 doubling |
title_sort |
responses of basal melting of antarctic ice shelves to the climatic forcing of the last glacial maximum and co2 doubling |
publisher |
Amer Meteorological Soc |
publishDate |
2017 |
url |
https://eprints.utas.edu.au/26456/ https://eprints.utas.edu.au/26456/1/Obase_JC_2017.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Sea ice |
genre_facet |
Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Sea ice |
op_relation |
https://eprints.utas.edu.au/26456/1/Obase_JC_2017.pdf Obase, T, Abe-Ouchi, A, Kusahara, K orcid:0000-0003-4067-7959 , Hasumi, H and Ohgaito, R 2017 , 'Responses of basal melting of Antarctic ice shelves to the climatic forcing of the last glacial maximum and CO2 doubling' , Journal of Climate, vol. 30, no. 10 , pp. 3473-3497 , doi:10.1175/JCLI-D-15-0908.1 <http://dx.doi.org/10.1175/JCLI-D-15-0908.1>. |
op_doi |
https://doi.org/10.1175/JCLI-D-15-0908.1 |
container_title |
Journal of Climate |
container_volume |
30 |
container_issue |
10 |
container_start_page |
3473 |
op_container_end_page |
3497 |
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1766021792944619520 |