Responces of melting below Antarctic ice shelf to climate
The Antarctic Ice Sheet is buttressed by floating ice shelves. Calving at ice shelf front and basal melting below ice shelf are main ablation processes of Antarctic ice sheet(Rignot et al., 2013). Future collapse of West Antarctic Ice Sheet(WAIS) caused by enhanced basal melting and thinner ice shel...
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ftnipr:oai:nipr.repo.nii.ac.jp:00011685 2023-07-30T03:57:11+02:00 Responces of melting below Antarctic ice shelf to climate 小長谷 貴志 阿部 彩子 草原 和弥 羽角 博康 Obase Takashi Abe-Ouchi Ayako Kusahara Kazuya Hasumi Hiroyasu 2016-04-11 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=11685 http://id.nii.ac.jp/1291/00011632/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=11685&item_no=1&attribute_id=16&file_no=1 en eng https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=11685 http://id.nii.ac.jp/1291/00011632/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=11685&item_no=1&attribute_id=16&file_no=1 2013-11-15 Presentation 2016 ftnipr 2023-07-15T19:41:39Z The Antarctic Ice Sheet is buttressed by floating ice shelves. Calving at ice shelf front and basal melting below ice shelf are main ablation processes of Antarctic ice sheet(Rignot et al., 2013). Future collapse of West Antarctic Ice Sheet(WAIS) caused by enhanced basal melting and thinner ice shelf has potential contribution to global sea level rise in the magnitude of 5m. Pollard and Deconto(2009) showed increase of ocean temperature and enhanced basal melting of ice shelf in warmer climate is crucial to the retreat of WAIS using 3-dimensional ice sheet-shelf model. Since increase or decrease of basal melt rate time as the climate and topography change is challenging, they used simple parameterization. Sensitivity of basal melting to ocean temperature is investigated using ocean general circulation model which considers circulation of ice shelf cavities and basal melting of ice shelf. Kusahara and Hasumi (2013) developed ocean general circulation model which resolves all Antarctic ice shelves, and they estimated basal melt rate at present state and its sensitivity to surface air warming. But the variation of basal melt rate on longer time scale by a ocean model which resolves whole Antarctica is not investigated.In this study, circumpolar ice shelf-sea ice-ocean coupled model(Kusahara and Hasumi, 2013) is used and sensitivity of basal melting to climate is investigated. Two experiments beside CTRL case are carried. One is doubled CO2 and the other is Last Glacial Maximum(LGM). Northern boundary and surface boundary condition is needed since the model used in present study is regional model. These boundary conditions are taken from the experiments carried out by atmospheric and ocean general circulation model. Topography of ice sheet and ice shelf is fixed to present state. Simulated basal melting over whole Antarctica in the CTRL case is 810 Gt/yr. Distribution of basal melt rate shows active melting near grounding line and ice shelves in western side of Antarctic Peninsula, in constrast less melting in Ross ... Conference Object Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelf Ice Shelves Sea ice National Institute of Polar Research Repository, Japan Antarctic The Antarctic Antarctic Peninsula West Antarctic Ice Sheet Pollard ENVELOPE(64.617,64.617,-70.467,-70.467) |
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Open Polar |
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National Institute of Polar Research Repository, Japan |
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ftnipr |
language |
English |
description |
The Antarctic Ice Sheet is buttressed by floating ice shelves. Calving at ice shelf front and basal melting below ice shelf are main ablation processes of Antarctic ice sheet(Rignot et al., 2013). Future collapse of West Antarctic Ice Sheet(WAIS) caused by enhanced basal melting and thinner ice shelf has potential contribution to global sea level rise in the magnitude of 5m. Pollard and Deconto(2009) showed increase of ocean temperature and enhanced basal melting of ice shelf in warmer climate is crucial to the retreat of WAIS using 3-dimensional ice sheet-shelf model. Since increase or decrease of basal melt rate time as the climate and topography change is challenging, they used simple parameterization. Sensitivity of basal melting to ocean temperature is investigated using ocean general circulation model which considers circulation of ice shelf cavities and basal melting of ice shelf. Kusahara and Hasumi (2013) developed ocean general circulation model which resolves all Antarctic ice shelves, and they estimated basal melt rate at present state and its sensitivity to surface air warming. But the variation of basal melt rate on longer time scale by a ocean model which resolves whole Antarctica is not investigated.In this study, circumpolar ice shelf-sea ice-ocean coupled model(Kusahara and Hasumi, 2013) is used and sensitivity of basal melting to climate is investigated. Two experiments beside CTRL case are carried. One is doubled CO2 and the other is Last Glacial Maximum(LGM). Northern boundary and surface boundary condition is needed since the model used in present study is regional model. These boundary conditions are taken from the experiments carried out by atmospheric and ocean general circulation model. Topography of ice sheet and ice shelf is fixed to present state. Simulated basal melting over whole Antarctica in the CTRL case is 810 Gt/yr. Distribution of basal melt rate shows active melting near grounding line and ice shelves in western side of Antarctic Peninsula, in constrast less melting in Ross ... |
format |
Conference Object |
author |
小長谷 貴志 阿部 彩子 草原 和弥 羽角 博康 Obase Takashi Abe-Ouchi Ayako Kusahara Kazuya Hasumi Hiroyasu |
spellingShingle |
小長谷 貴志 阿部 彩子 草原 和弥 羽角 博康 Obase Takashi Abe-Ouchi Ayako Kusahara Kazuya Hasumi Hiroyasu Responces of melting below Antarctic ice shelf to climate |
author_facet |
小長谷 貴志 阿部 彩子 草原 和弥 羽角 博康 Obase Takashi Abe-Ouchi Ayako Kusahara Kazuya Hasumi Hiroyasu |
author_sort |
小長谷 貴志 |
title |
Responces of melting below Antarctic ice shelf to climate |
title_short |
Responces of melting below Antarctic ice shelf to climate |
title_full |
Responces of melting below Antarctic ice shelf to climate |
title_fullStr |
Responces of melting below Antarctic ice shelf to climate |
title_full_unstemmed |
Responces of melting below Antarctic ice shelf to climate |
title_sort |
responces of melting below antarctic ice shelf to climate |
publishDate |
2016 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=11685 http://id.nii.ac.jp/1291/00011632/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=11685&item_no=1&attribute_id=16&file_no=1 |
long_lat |
ENVELOPE(64.617,64.617,-70.467,-70.467) |
geographic |
Antarctic The Antarctic Antarctic Peninsula West Antarctic Ice Sheet Pollard |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula West Antarctic Ice Sheet Pollard |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelf Ice Shelves Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Sheet Ice Shelf Ice Shelves Sea ice |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=11685 http://id.nii.ac.jp/1291/00011632/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=11685&item_no=1&attribute_id=16&file_no=1 2013-11-15 |
_version_ |
1772816210652561408 |