Antarctic Slope Current Modulates Ocean Heat Intrusions Towards Totten Glacier
The Totten ice shelf (TIS) in East Antarctica has received increasing attention in recent years due to high basal melt rates, which have been linked to a presence of warm modified Circumpolar Deep Water (mCDW) observed at the ice front. We show that mCDW on-shelf intrusions towards the TIS strengthe...
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Online Access: | http://hdl.handle.net/2115/82927 https://doi.org/10.1029/2021GL094149 |
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/82927 2023-05-15T13:51:33+02:00 Antarctic Slope Current Modulates Ocean Heat Intrusions Towards Totten Glacier Nakayama, Yoshihiro Greene, Chad A. Paolo, Fernando S. Mensah, Vigan Zhang, Hong Kashiwase, Haruhiko Simizu, Daisuke Greenbaum, Jamin S. Blankenship, Donald D. Abe-Ouchi, Ayako Aoki, Shigeru http://hdl.handle.net/2115/82927 https://doi.org/10.1029/2021GL094149 eng eng American Geophysical Union http://hdl.handle.net/2115/82927 Geophysical research letters, 48(17): e2021GL094149 http://dx.doi.org/10.1029/2021GL094149 Southern Ocean ice shelf ocean heat intrusions Antarctic slope current ocean modeling ice shelf-ocean interaction 450 article fthokunivhus https://doi.org/10.1029/2021GL094149 2022-11-18T01:06:41Z The Totten ice shelf (TIS) in East Antarctica has received increasing attention in recent years due to high basal melt rates, which have been linked to a presence of warm modified Circumpolar Deep Water (mCDW) observed at the ice front. We show that mCDW on-shelf intrusions towards the TIS strengthen when the Antarctic Slope Current (ASC) weakens. This demonstrates that the ASC has a blocking effect and ASC weakening leads to on-shelf intrusions, as proposed by previous observational studies. The interannual variability of the ASC is controlled primarily by atmospheric and oceanic conditions beyond our regional model domain. We further show that heat intrusions onto the continental shelf off the TIS are not influenced by off-shelf warming but are enhanced with coastal freshening, suggesting positive feedback whereby ice melt and freshening upstream could start a chain reaction, leading to increased melt, and further coastal freshening. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Shelf Southern Ocean Totten Glacier Totten Ice Shelf Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic Southern Ocean The Antarctic East Antarctica Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) Geophysical Research Letters 48 17 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Southern Ocean ice shelf ocean heat intrusions Antarctic slope current ocean modeling ice shelf-ocean interaction 450 |
spellingShingle |
Southern Ocean ice shelf ocean heat intrusions Antarctic slope current ocean modeling ice shelf-ocean interaction 450 Nakayama, Yoshihiro Greene, Chad A. Paolo, Fernando S. Mensah, Vigan Zhang, Hong Kashiwase, Haruhiko Simizu, Daisuke Greenbaum, Jamin S. Blankenship, Donald D. Abe-Ouchi, Ayako Aoki, Shigeru Antarctic Slope Current Modulates Ocean Heat Intrusions Towards Totten Glacier |
topic_facet |
Southern Ocean ice shelf ocean heat intrusions Antarctic slope current ocean modeling ice shelf-ocean interaction 450 |
description |
The Totten ice shelf (TIS) in East Antarctica has received increasing attention in recent years due to high basal melt rates, which have been linked to a presence of warm modified Circumpolar Deep Water (mCDW) observed at the ice front. We show that mCDW on-shelf intrusions towards the TIS strengthen when the Antarctic Slope Current (ASC) weakens. This demonstrates that the ASC has a blocking effect and ASC weakening leads to on-shelf intrusions, as proposed by previous observational studies. The interannual variability of the ASC is controlled primarily by atmospheric and oceanic conditions beyond our regional model domain. We further show that heat intrusions onto the continental shelf off the TIS are not influenced by off-shelf warming but are enhanced with coastal freshening, suggesting positive feedback whereby ice melt and freshening upstream could start a chain reaction, leading to increased melt, and further coastal freshening. |
format |
Article in Journal/Newspaper |
author |
Nakayama, Yoshihiro Greene, Chad A. Paolo, Fernando S. Mensah, Vigan Zhang, Hong Kashiwase, Haruhiko Simizu, Daisuke Greenbaum, Jamin S. Blankenship, Donald D. Abe-Ouchi, Ayako Aoki, Shigeru |
author_facet |
Nakayama, Yoshihiro Greene, Chad A. Paolo, Fernando S. Mensah, Vigan Zhang, Hong Kashiwase, Haruhiko Simizu, Daisuke Greenbaum, Jamin S. Blankenship, Donald D. Abe-Ouchi, Ayako Aoki, Shigeru |
author_sort |
Nakayama, Yoshihiro |
title |
Antarctic Slope Current Modulates Ocean Heat Intrusions Towards Totten Glacier |
title_short |
Antarctic Slope Current Modulates Ocean Heat Intrusions Towards Totten Glacier |
title_full |
Antarctic Slope Current Modulates Ocean Heat Intrusions Towards Totten Glacier |
title_fullStr |
Antarctic Slope Current Modulates Ocean Heat Intrusions Towards Totten Glacier |
title_full_unstemmed |
Antarctic Slope Current Modulates Ocean Heat Intrusions Towards Totten Glacier |
title_sort |
antarctic slope current modulates ocean heat intrusions towards totten glacier |
publisher |
American Geophysical Union |
url |
http://hdl.handle.net/2115/82927 https://doi.org/10.1029/2021GL094149 |
long_lat |
ENVELOPE(116.333,116.333,-66.833,-66.833) |
geographic |
Antarctic Southern Ocean The Antarctic East Antarctica Totten Glacier |
geographic_facet |
Antarctic Southern Ocean The Antarctic East Antarctica Totten Glacier |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf Southern Ocean Totten Glacier Totten Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Shelf Southern Ocean Totten Glacier Totten Ice Shelf |
op_relation |
http://hdl.handle.net/2115/82927 Geophysical research letters, 48(17): e2021GL094149 http://dx.doi.org/10.1029/2021GL094149 |
op_doi |
https://doi.org/10.1029/2021GL094149 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
17 |
_version_ |
1766255460494606336 |