Pathways of basal meltwater from Antarctic ice shelves: A model study
We investigate spreading pathways of basal meltwater released from all Antarctic ice shelves using a circumpolar coupled ice shelf-sea ice-ocean model that reproduces major features of the Southern Ocean circulation, including the Antarctic Circumpolar Current (ACC). Several independent virtual trac...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
|
Subjects: | |
Online Access: | http://hdl.handle.net/2115/58053 https://doi.org/10.1002/2014JC009915 |
id |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/58053 |
---|---|
record_format |
openpolar |
spelling |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/58053 2023-05-15T13:40:56+02:00 Pathways of basal meltwater from Antarctic ice shelves: A model study Kusahara, Kazuya Hasumi, Hiroyasu http://hdl.handle.net/2115/58053 https://doi.org/10.1002/2014JC009915 eng eng American Geophysical Union http://hdl.handle.net/2115/58053 Journal of Geophysical Research, Oceans, 119(9): 5690-5704 http://dx.doi.org/10.1002/2014JC009915 Copyright 2014 American Geophysical Union. Antarctic ice shelves ice shelf basal meltwater virtual tracer experiments 452 article fthokunivhus https://doi.org/10.1002/2014JC009915 2022-11-18T01:03:21Z We investigate spreading pathways of basal meltwater released from all Antarctic ice shelves using a circumpolar coupled ice shelf-sea ice-ocean model that reproduces major features of the Southern Ocean circulation, including the Antarctic Circumpolar Current (ACC). Several independent virtual tracers are used to identify detailed pathways of basal meltwaters. The spreading pathways of the meltwater tracers depend on formation sites, because the meltwaters are transported by local ambient ocean circulation. Meltwaters from ice shelves in the Weddell and Amundsen-Bellingshausen Seas in surface/subsurface layers are effectively advected to lower latitudes with the ACC. Although a large portion of the basal meltwaters is present in surface and subsurface layers, a part of the basal meltwaters penetrates into the bottom layer through active dense water formation along the Antarctic coastal margins. The signals at the seafloor extend along the topography, showing a horizontal distribution similar to the observed spreading of Antarctic Bottom Water. Meltwaters originating from ice shelves in the Weddell and Ross Seas and in the Indian sector significantly contribute to the bottom signals. A series of numerical experiments in which thermodynamic interaction between the ice shelf and ocean is neglected regionally demonstrates that the basal meltwater of each ice shelf impacts sea ice and/or ocean thermohaline circulation in the Southern Ocean. Article in Journal/Newspaper Antarc* Antarctic Ice Shelf Ice Shelves Sea ice Southern Ocean Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic Southern Ocean The Antarctic Indian Weddell Journal of Geophysical Research: Oceans 119 9 5690 5704 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Antarctic ice shelves ice shelf basal meltwater virtual tracer experiments 452 |
spellingShingle |
Antarctic ice shelves ice shelf basal meltwater virtual tracer experiments 452 Kusahara, Kazuya Hasumi, Hiroyasu Pathways of basal meltwater from Antarctic ice shelves: A model study |
topic_facet |
Antarctic ice shelves ice shelf basal meltwater virtual tracer experiments 452 |
description |
We investigate spreading pathways of basal meltwater released from all Antarctic ice shelves using a circumpolar coupled ice shelf-sea ice-ocean model that reproduces major features of the Southern Ocean circulation, including the Antarctic Circumpolar Current (ACC). Several independent virtual tracers are used to identify detailed pathways of basal meltwaters. The spreading pathways of the meltwater tracers depend on formation sites, because the meltwaters are transported by local ambient ocean circulation. Meltwaters from ice shelves in the Weddell and Amundsen-Bellingshausen Seas in surface/subsurface layers are effectively advected to lower latitudes with the ACC. Although a large portion of the basal meltwaters is present in surface and subsurface layers, a part of the basal meltwaters penetrates into the bottom layer through active dense water formation along the Antarctic coastal margins. The signals at the seafloor extend along the topography, showing a horizontal distribution similar to the observed spreading of Antarctic Bottom Water. Meltwaters originating from ice shelves in the Weddell and Ross Seas and in the Indian sector significantly contribute to the bottom signals. A series of numerical experiments in which thermodynamic interaction between the ice shelf and ocean is neglected regionally demonstrates that the basal meltwater of each ice shelf impacts sea ice and/or ocean thermohaline circulation in the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Kusahara, Kazuya Hasumi, Hiroyasu |
author_facet |
Kusahara, Kazuya Hasumi, Hiroyasu |
author_sort |
Kusahara, Kazuya |
title |
Pathways of basal meltwater from Antarctic ice shelves: A model study |
title_short |
Pathways of basal meltwater from Antarctic ice shelves: A model study |
title_full |
Pathways of basal meltwater from Antarctic ice shelves: A model study |
title_fullStr |
Pathways of basal meltwater from Antarctic ice shelves: A model study |
title_full_unstemmed |
Pathways of basal meltwater from Antarctic ice shelves: A model study |
title_sort |
pathways of basal meltwater from antarctic ice shelves: a model study |
publisher |
American Geophysical Union |
url |
http://hdl.handle.net/2115/58053 https://doi.org/10.1002/2014JC009915 |
geographic |
Antarctic Southern Ocean The Antarctic Indian Weddell |
geographic_facet |
Antarctic Southern Ocean The Antarctic Indian Weddell |
genre |
Antarc* Antarctic Ice Shelf Ice Shelves Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Shelf Ice Shelves Sea ice Southern Ocean |
op_relation |
http://hdl.handle.net/2115/58053 Journal of Geophysical Research, Oceans, 119(9): 5690-5704 http://dx.doi.org/10.1002/2014JC009915 |
op_rights |
Copyright 2014 American Geophysical Union. |
op_doi |
https://doi.org/10.1002/2014JC009915 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
119 |
container_issue |
9 |
container_start_page |
5690 |
op_container_end_page |
5704 |
_version_ |
1766143464302444544 |