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Multidecadal poleward shift of the southern boundary of the Antarctic Circumpolar Current off East Antarctica

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Title: Multidecadal poleward shift of the southern boundary of the Antarctic Circumpolar Current off East Antarctica
Authors: Yamazaki, Kaihe Browse this author
Aoki, Shigeru Browse this author →KAKEN DB
Katsumata, Katsuro Browse this author
Hirano, Daisuke Browse this author
Nakayama, Yoshihiro Browse this author
Issue Date: 11-Jun-2021
Publisher: The American Association for the Advancement of Science(AAAS)
Journal Title: Science advances
Volume: 7
Issue: 24
Start Page: eabf8755
Publisher DOI: 10.1126/sciadv.abf8755
Abstract: 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.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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