Interannual Variation of Modified Circumpolar Deep Water in the Dotson‐Getz Trough, West Antarctica
Widespread ice shelf thinning has been recorded in the Amundsen Sea in recent decades, driven by basal melting and intrusions of relatively warm Circumpolar Deep Water (CDW) onto the continental shelf. The Dotson Ice Shelf (DIS) is located to the south of the Amundsen Sea polynya, and has a high bas...
Published in: | Journal of Geophysical Research: Oceans |
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Language: | English |
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American Geophysical Union
2021
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/47897/ https://doi.org/10.1029/2021jc017491 https://nrl.northumbria.ac.uk/id/eprint/47897/1/2021JC017491.pdf https://nrl.northumbria.ac.uk/id/eprint/47897/8/JGR%20Oceans%20-%202021%20-%20Kim%20-%20Interannual%20Variation%20of%20Modified%20Circumpolar%20Deep%20Water%20in%20the%20Dotson%E2%80%90Getz%20Trough%20%20West.pdf |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:47897 2023-05-15T13:23:38+02:00 Interannual Variation of Modified Circumpolar Deep Water in the Dotson‐Getz Trough, West Antarctica Kim, Tae‐Wan Yang, Hee Won Dutrieux, Pierre Wåhlin, Anna K. Jenkins, Adrian Kim, Yeong Gi Ha, Ho Kyung Kim, Chang‐Sin Cho, Kyoung‐Ho Park, Taewook Park, Jisoo Lee, SangHoon Cho, Y. K. 2021-12 text https://nrl.northumbria.ac.uk/id/eprint/47897/ https://doi.org/10.1029/2021jc017491 https://nrl.northumbria.ac.uk/id/eprint/47897/1/2021JC017491.pdf https://nrl.northumbria.ac.uk/id/eprint/47897/8/JGR%20Oceans%20-%202021%20-%20Kim%20-%20Interannual%20Variation%20of%20Modified%20Circumpolar%20Deep%20Water%20in%20the%20Dotson%E2%80%90Getz%20Trough%20%20West.pdf en eng American Geophysical Union https://nrl.northumbria.ac.uk/id/eprint/47897/1/2021JC017491.pdf https://nrl.northumbria.ac.uk/id/eprint/47897/8/JGR%20Oceans%20-%202021%20-%20Kim%20-%20Interannual%20Variation%20of%20Modified%20Circumpolar%20Deep%20Water%20in%20the%20Dotson%E2%80%90Getz%20Trough%20%20West.pdf Kim, Tae‐Wan, Yang, Hee Won, Dutrieux, Pierre, Wåhlin, Anna K., Jenkins, Adrian, Kim, Yeong Gi, Ha, Ho Kyung, Kim, Chang‐Sin, Cho, Kyoung‐Ho, Park, Taewook, Park, Jisoo, Lee, SangHoon and Cho, Y. K. (2021) Interannual Variation of Modified Circumpolar Deep Water in the Dotson‐Getz Trough, West Antarctica. Journal of Geophysical Research: Oceans, 126 (12). e2021JC017491. ISSN 2169-9275 cc_by_nc_nd_4_0 CC-BY-NC-ND F700 Ocean Sciences Article PeerReviewed 2021 ftunivnorthumb https://doi.org/10.1029/2021jc017491 2022-09-25T06:14:53Z Widespread ice shelf thinning has been recorded in the Amundsen Sea in recent decades, driven by basal melting and intrusions of relatively warm Circumpolar Deep Water (CDW) onto the continental shelf. The Dotson Ice Shelf (DIS) is located to the south of the Amundsen Sea polynya, and has a high basal melting rate because modified CDW (mCDW) fills the Dotson-Getz Trough (DGT) and reaches the base of the ice shelf. Here, hydrographic data in the DGT obtained during seven oceanographic surveys from 2007 to 2018 were used to study the interannual variation in mCDW volume and properties and their causes. Although mCDW volume showed relatively weak interannual variations at the continental shelf break, these variations intensified southward and reached a maximum in front of the DIS. There, the mCDW volume was ∼8,000 km3 in 2007, rapidly decreased to 4,700 km3 in 2014 before rebounding to 7,300 km3 in 2018. We find that such interannual variability is coherent with local Ekman pumping integrated along the DGT modulated by the presence of sea ice, and complementing earlier theories involving shelf break winds only. The interannual variability in strength of the dominant south-southeast coastal wind modulates the amplitude of Ekman upwelling along the eastern boundary of the Amundsen Sea polynya during the austral summers of the surveyed years, apparently leading to change in the volume of mCDW along the DGT. We note a strong correlation between the wind variability and the longitudinal location of the Amundsen Sea Low. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctica Antarctica Journal Dotson Ice Shelf Ice Shelf Sea ice West Antarctica Northumbria University, Newcastle: Northumbria Research Link (NRL) Amundsen Sea Austral Dotson Ice Shelf ENVELOPE(-112.367,-112.367,-74.400,-74.400) Dotson-Getz Trough ENVELOPE(-114.775,-114.775,-73.231,-73.231) Getz ENVELOPE(-145.217,-145.217,-76.550,-76.550) West Antarctica Journal of Geophysical Research: Oceans 126 12 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F700 Ocean Sciences |
spellingShingle |
F700 Ocean Sciences Kim, Tae‐Wan Yang, Hee Won Dutrieux, Pierre Wåhlin, Anna K. Jenkins, Adrian Kim, Yeong Gi Ha, Ho Kyung Kim, Chang‐Sin Cho, Kyoung‐Ho Park, Taewook Park, Jisoo Lee, SangHoon Cho, Y. K. Interannual Variation of Modified Circumpolar Deep Water in the Dotson‐Getz Trough, West Antarctica |
topic_facet |
F700 Ocean Sciences |
description |
Widespread ice shelf thinning has been recorded in the Amundsen Sea in recent decades, driven by basal melting and intrusions of relatively warm Circumpolar Deep Water (CDW) onto the continental shelf. The Dotson Ice Shelf (DIS) is located to the south of the Amundsen Sea polynya, and has a high basal melting rate because modified CDW (mCDW) fills the Dotson-Getz Trough (DGT) and reaches the base of the ice shelf. Here, hydrographic data in the DGT obtained during seven oceanographic surveys from 2007 to 2018 were used to study the interannual variation in mCDW volume and properties and their causes. Although mCDW volume showed relatively weak interannual variations at the continental shelf break, these variations intensified southward and reached a maximum in front of the DIS. There, the mCDW volume was ∼8,000 km3 in 2007, rapidly decreased to 4,700 km3 in 2014 before rebounding to 7,300 km3 in 2018. We find that such interannual variability is coherent with local Ekman pumping integrated along the DGT modulated by the presence of sea ice, and complementing earlier theories involving shelf break winds only. The interannual variability in strength of the dominant south-southeast coastal wind modulates the amplitude of Ekman upwelling along the eastern boundary of the Amundsen Sea polynya during the austral summers of the surveyed years, apparently leading to change in the volume of mCDW along the DGT. We note a strong correlation between the wind variability and the longitudinal location of the Amundsen Sea Low. |
format |
Article in Journal/Newspaper |
author |
Kim, Tae‐Wan Yang, Hee Won Dutrieux, Pierre Wåhlin, Anna K. Jenkins, Adrian Kim, Yeong Gi Ha, Ho Kyung Kim, Chang‐Sin Cho, Kyoung‐Ho Park, Taewook Park, Jisoo Lee, SangHoon Cho, Y. K. |
author_facet |
Kim, Tae‐Wan Yang, Hee Won Dutrieux, Pierre Wåhlin, Anna K. Jenkins, Adrian Kim, Yeong Gi Ha, Ho Kyung Kim, Chang‐Sin Cho, Kyoung‐Ho Park, Taewook Park, Jisoo Lee, SangHoon Cho, Y. K. |
author_sort |
Kim, Tae‐Wan |
title |
Interannual Variation of Modified Circumpolar Deep Water in the Dotson‐Getz Trough, West Antarctica |
title_short |
Interannual Variation of Modified Circumpolar Deep Water in the Dotson‐Getz Trough, West Antarctica |
title_full |
Interannual Variation of Modified Circumpolar Deep Water in the Dotson‐Getz Trough, West Antarctica |
title_fullStr |
Interannual Variation of Modified Circumpolar Deep Water in the Dotson‐Getz Trough, West Antarctica |
title_full_unstemmed |
Interannual Variation of Modified Circumpolar Deep Water in the Dotson‐Getz Trough, West Antarctica |
title_sort |
interannual variation of modified circumpolar deep water in the dotson‐getz trough, west antarctica |
publisher |
American Geophysical Union |
publishDate |
2021 |
url |
https://nrl.northumbria.ac.uk/id/eprint/47897/ https://doi.org/10.1029/2021jc017491 https://nrl.northumbria.ac.uk/id/eprint/47897/1/2021JC017491.pdf https://nrl.northumbria.ac.uk/id/eprint/47897/8/JGR%20Oceans%20-%202021%20-%20Kim%20-%20Interannual%20Variation%20of%20Modified%20Circumpolar%20Deep%20Water%20in%20the%20Dotson%E2%80%90Getz%20Trough%20%20West.pdf |
long_lat |
ENVELOPE(-112.367,-112.367,-74.400,-74.400) ENVELOPE(-114.775,-114.775,-73.231,-73.231) ENVELOPE(-145.217,-145.217,-76.550,-76.550) |
geographic |
Amundsen Sea Austral Dotson Ice Shelf Dotson-Getz Trough Getz West Antarctica |
geographic_facet |
Amundsen Sea Austral Dotson Ice Shelf Dotson-Getz Trough Getz West Antarctica |
genre |
Amundsen Sea Antarc* Antarctica Antarctica Journal Dotson Ice Shelf Ice Shelf Sea ice West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctica Antarctica Journal Dotson Ice Shelf Ice Shelf Sea ice West Antarctica |
op_relation |
https://nrl.northumbria.ac.uk/id/eprint/47897/1/2021JC017491.pdf https://nrl.northumbria.ac.uk/id/eprint/47897/8/JGR%20Oceans%20-%202021%20-%20Kim%20-%20Interannual%20Variation%20of%20Modified%20Circumpolar%20Deep%20Water%20in%20the%20Dotson%E2%80%90Getz%20Trough%20%20West.pdf Kim, Tae‐Wan, Yang, Hee Won, Dutrieux, Pierre, Wåhlin, Anna K., Jenkins, Adrian, Kim, Yeong Gi, Ha, Ho Kyung, Kim, Chang‐Sin, Cho, Kyoung‐Ho, Park, Taewook, Park, Jisoo, Lee, SangHoon and Cho, Y. K. (2021) Interannual Variation of Modified Circumpolar Deep Water in the Dotson‐Getz Trough, West Antarctica. Journal of Geophysical Research: Oceans, 126 (12). e2021JC017491. ISSN 2169-9275 |
op_rights |
cc_by_nc_nd_4_0 |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1029/2021jc017491 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
126 |
container_issue |
12 |
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1766373662457331712 |