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The cyclonic circulation in the Australian-Antarctic basin simulated by an eddy-resolving general circulation model

journal contribution
posted on 2023-05-17, 06:55 authored by Aoki, S, Sasai, Y, Sasaki, H, Mitsudera, H, Guy Williams
Flow structure in the Australian-Antarctic basin is investigated using an eddy-resolving general ocean circulation model and validated with iceberg and middepth float trajectories. A cyclonic circulation system between the Antarctic Circumpolar Current and Antarctic Slope Current consists of a large-scale gyre in the west (80-110 degrees E) and a series of eddies in the east (120-150 degrees E). The western gyre has an annual mean westward transport of 22 Sv in the southern limb. Extending west through the Princess Elizabeth Trough, 5 Sv of the gyre recirculates off Prydz Bay and joins the western boundary current off the Kerguelen Plateau. Iceberg trajectories from QuickScat and ERS-1/2 support this recirculation and the overall structure of the Antarctic Slope Current against isobath in the model. Argo float trajectories also reveal a consistent structure of the deep westward slope current. This study indicates the presence of a large cyclonic circulation in this basin, which is comparable to the Weddell and Ross gyres.

History

Publication title

Ocean Dynamics

Volume

60

Pagination

743-757

ISSN

1616-7341

Department/School

Institute for Marine and Antarctic Studies

Publisher

Springer

Place of publication

Heidelberg, Germany

Repository Status

  • Restricted

Socio-economic Objectives

Antarctic and Southern Ocean oceanic processes

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