Multidecadal poleward shift of the southern boundary of the Antarctic Circumpolar Current off East Antarctica
The southern boundary (SB) of the Antarctic Circumpolar Current, the southernmost extent of the upper overturning circulation, regulates the Antarctic thermal conditions. The SB's behavior remains unconstrained because it does not have a clear surface signature. Revisited hydrographic data from...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/82560 2023-05-15T13:51:33+02:00 Multidecadal poleward shift of the southern boundary of the Antarctic Circumpolar Current off East Antarctica Yamazaki, Kaihe Aoki, Shigeru Katsumata, Katsuro Hirano, Daisuke Nakayama, Yoshihiro http://hdl.handle.net/2115/82560 https://doi.org/10.1126/sciadv.abf8755 eng eng The American Association for the Advancement of Science(AAAS) http://hdl.handle.net/2115/82560 Science advances, 7(24): eabf8755 http://dx.doi.org/10.1126/sciadv.abf8755 450 article fthokunivhus https://doi.org/10.1126/sciadv.abf8755 2022-11-18T01:06:36Z The southern boundary (SB) of the Antarctic Circumpolar Current, the southernmost extent of the upper overturning circulation, regulates the Antarctic thermal conditions. The SB's behavior remains unconstrained because it does not have a clear surface signature. Revisited hydrographic data from off East Antarctica indicate full-depth warming from 1996 to 2019, concurrent with an extensive poleward shift of the SB subsurface isotherms (>50 km), which is most prominent at 120 degrees E off the Sabrina Coast. The SB shift is attributable to enhanced upper overturning circulation and a depth-independent frontal shift, generally accounting for 30 and 70%, respectively. Thirty years of oceanographic data corroborate the overall and localized poleward shifts that are likely controlled by continental slope topography. Numerical experiments successfully reproduce this locality and demonstrate its sensitivity to mesoscale processes and wind forcing. The poleward SB shift under intensified westerlies potentially induces multidecadal warming of Antarctic shelf water. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic East Antarctica Sabrina Coast ENVELOPE(118.550,118.550,-67.000,-67.000) The Antarctic Science Advances 7 24 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
450 |
spellingShingle |
450 Yamazaki, Kaihe Aoki, Shigeru Katsumata, Katsuro Hirano, Daisuke Nakayama, Yoshihiro Multidecadal poleward shift of the southern boundary of the Antarctic Circumpolar Current off East Antarctica |
topic_facet |
450 |
description |
The southern boundary (SB) of the Antarctic Circumpolar Current, the southernmost extent of the upper overturning circulation, regulates the Antarctic thermal conditions. The SB's behavior remains unconstrained because it does not have a clear surface signature. Revisited hydrographic data from off East Antarctica indicate full-depth warming from 1996 to 2019, concurrent with an extensive poleward shift of the SB subsurface isotherms (>50 km), which is most prominent at 120 degrees E off the Sabrina Coast. The SB shift is attributable to enhanced upper overturning circulation and a depth-independent frontal shift, generally accounting for 30 and 70%, respectively. Thirty years of oceanographic data corroborate the overall and localized poleward shifts that are likely controlled by continental slope topography. Numerical experiments successfully reproduce this locality and demonstrate its sensitivity to mesoscale processes and wind forcing. The poleward SB shift under intensified westerlies potentially induces multidecadal warming of Antarctic shelf water. |
format |
Article in Journal/Newspaper |
author |
Yamazaki, Kaihe Aoki, Shigeru Katsumata, Katsuro Hirano, Daisuke Nakayama, Yoshihiro |
author_facet |
Yamazaki, Kaihe Aoki, Shigeru Katsumata, Katsuro Hirano, Daisuke Nakayama, Yoshihiro |
author_sort |
Yamazaki, Kaihe |
title |
Multidecadal poleward shift of the southern boundary of the Antarctic Circumpolar Current off East Antarctica |
title_short |
Multidecadal poleward shift of the southern boundary of the Antarctic Circumpolar Current off East Antarctica |
title_full |
Multidecadal poleward shift of the southern boundary of the Antarctic Circumpolar Current off East Antarctica |
title_fullStr |
Multidecadal poleward shift of the southern boundary of the Antarctic Circumpolar Current off East Antarctica |
title_full_unstemmed |
Multidecadal poleward shift of the southern boundary of the Antarctic Circumpolar Current off East Antarctica |
title_sort |
multidecadal poleward shift of the southern boundary of the antarctic circumpolar current off east antarctica |
publisher |
The American Association for the Advancement of Science(AAAS) |
url |
http://hdl.handle.net/2115/82560 https://doi.org/10.1126/sciadv.abf8755 |
long_lat |
ENVELOPE(118.550,118.550,-67.000,-67.000) |
geographic |
Antarctic East Antarctica Sabrina Coast The Antarctic |
geographic_facet |
Antarctic East Antarctica Sabrina Coast The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica |
op_relation |
http://hdl.handle.net/2115/82560 Science advances, 7(24): eabf8755 http://dx.doi.org/10.1126/sciadv.abf8755 |
op_doi |
https://doi.org/10.1126/sciadv.abf8755 |
container_title |
Science Advances |
container_volume |
7 |
container_issue |
24 |
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1766255459474341888 |