Modelling the Antarctic marine cryosphere at the Last Glacial Maximum
We estimate the sea-ice extent and basal melt of Antarctic ice shelves at the Last Glacial Maximum (LGM) using a coupled ice-shelf–sea-ice–ocean model. The shape of Antarctic ice shelves, ocean conditions and atmospheric surface conditions at the LGM are different from those in the present day; thes...
Published in: | Annals of Glaciology |
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Online Access: | http://hdl.handle.net/2115/61464 https://doi.org/10.3189/2015AoG69A792 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/61464 2023-05-15T13:29:12+02:00 Modelling the Antarctic marine cryosphere at the Last Glacial Maximum Kusahara, Kazuya Sato, Tatsuru Oka, Akira Obase, Takashi Greve, Ralf Abe-Ouchi, Ayako Hasumi, Hiroyasu http://hdl.handle.net/2115/61464 https://doi.org/10.3189/2015AoG69A792 eng eng International Glaciological Society http://www.igsoc.org/ http://hdl.handle.net/2115/61464 Annals of Glaciology, 56(69): 425-435 http://dx.doi.org/10.3189/2015AoG69A792 © 2015 International Glaciological Society climate change ice shelves ice/ocean interactions palaeoclimate sea-ice modelling 400 article fthokunivhus https://doi.org/10.3189/2015AoG69A792 2022-11-18T01:03:45Z We estimate the sea-ice extent and basal melt of Antarctic ice shelves at the Last Glacial Maximum (LGM) using a coupled ice-shelf–sea-ice–ocean model. The shape of Antarctic ice shelves, ocean conditions and atmospheric surface conditions at the LGM are different from those in the present day; these are derived from an ice-shelf–ice-sheet model, a sea-ice–ocean model and a climate model for glacial simulations, respectively. The winter sea ice in the LGM is shown to extend up to ~7° of latitude further equatorward than in the present day. For the LGM summer, the model shows extensive sea-ice cover in the Atlantic sector and little sea ice in the other sectors. These modelled sea-ice features are consistent with those reconstructed from sea-floor sedimentary records. Total basal melt of Antarctic ice shelves in the LGM was ~2147 Gt a–1, which is much larger than the present-day value. More warm waters originating from Circumpolar Deep Water could be easily transported into ice-shelf cavities during the LGM because the full glacial grounding line extended to shelf break regions and ice shelves overhung continental slopes. This increased transport of warm water masses underneath an ice shelf and into their basal cavities led to the high basal melt of ice shelves in the LGM. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Sea ice Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic The Antarctic Annals of Glaciology 56 69 425 435 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
climate change ice shelves ice/ocean interactions palaeoclimate sea-ice modelling 400 |
spellingShingle |
climate change ice shelves ice/ocean interactions palaeoclimate sea-ice modelling 400 Kusahara, Kazuya Sato, Tatsuru Oka, Akira Obase, Takashi Greve, Ralf Abe-Ouchi, Ayako Hasumi, Hiroyasu Modelling the Antarctic marine cryosphere at the Last Glacial Maximum |
topic_facet |
climate change ice shelves ice/ocean interactions palaeoclimate sea-ice modelling 400 |
description |
We estimate the sea-ice extent and basal melt of Antarctic ice shelves at the Last Glacial Maximum (LGM) using a coupled ice-shelf–sea-ice–ocean model. The shape of Antarctic ice shelves, ocean conditions and atmospheric surface conditions at the LGM are different from those in the present day; these are derived from an ice-shelf–ice-sheet model, a sea-ice–ocean model and a climate model for glacial simulations, respectively. The winter sea ice in the LGM is shown to extend up to ~7° of latitude further equatorward than in the present day. For the LGM summer, the model shows extensive sea-ice cover in the Atlantic sector and little sea ice in the other sectors. These modelled sea-ice features are consistent with those reconstructed from sea-floor sedimentary records. Total basal melt of Antarctic ice shelves in the LGM was ~2147 Gt a–1, which is much larger than the present-day value. More warm waters originating from Circumpolar Deep Water could be easily transported into ice-shelf cavities during the LGM because the full glacial grounding line extended to shelf break regions and ice shelves overhung continental slopes. This increased transport of warm water masses underneath an ice shelf and into their basal cavities led to the high basal melt of ice shelves in the LGM. |
format |
Article in Journal/Newspaper |
author |
Kusahara, Kazuya Sato, Tatsuru Oka, Akira Obase, Takashi Greve, Ralf Abe-Ouchi, Ayako Hasumi, Hiroyasu |
author_facet |
Kusahara, Kazuya Sato, Tatsuru Oka, Akira Obase, Takashi Greve, Ralf Abe-Ouchi, Ayako Hasumi, Hiroyasu |
author_sort |
Kusahara, Kazuya |
title |
Modelling the Antarctic marine cryosphere at the Last Glacial Maximum |
title_short |
Modelling the Antarctic marine cryosphere at the Last Glacial Maximum |
title_full |
Modelling the Antarctic marine cryosphere at the Last Glacial Maximum |
title_fullStr |
Modelling the Antarctic marine cryosphere at the Last Glacial Maximum |
title_full_unstemmed |
Modelling the Antarctic marine cryosphere at the Last Glacial Maximum |
title_sort |
modelling the antarctic marine cryosphere at the last glacial maximum |
publisher |
International Glaciological Society |
url |
http://hdl.handle.net/2115/61464 https://doi.org/10.3189/2015AoG69A792 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Annals of Glaciology Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Sea ice |
genre_facet |
Annals of Glaciology Antarc* Antarctic Ice Sheet Ice Shelf Ice Shelves Sea ice |
op_relation |
http://www.igsoc.org/ http://hdl.handle.net/2115/61464 Annals of Glaciology, 56(69): 425-435 http://dx.doi.org/10.3189/2015AoG69A792 |
op_rights |
© 2015 International Glaciological Society |
op_doi |
https://doi.org/10.3189/2015AoG69A792 |
container_title |
Annals of Glaciology |
container_volume |
56 |
container_issue |
69 |
container_start_page |
425 |
op_container_end_page |
435 |
_version_ |
1765999215740190720 |