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Phased response of the subpolar Southern Ocean to changes in circumpolar winds

Phased response of the subpolar Southern Ocean to changes in circumpolar winds
Phased response of the subpolar Southern Ocean to changes in circumpolar winds
The response of the subpolar Southern Ocean (sSO) to wind forcing is assessed using satellite radar altimetry. sSO sea level exhibits a phased, zonally coherent, bi‐modal adjustment to circumpolar wind changes, involving comparable seasonal and interannual variations. The adjustment is effected via a quasi‐instantaneous exchange of mass between the Antarctic continental shelf and the sSO to the north, and a 2‐month‐delayed transfer of mass between the wider Southern Ocean and the subtropics. Both adjustment modes are consistent with an Ekman‐mediated response to variations in surface stress. Only the fast mode projects significantly onto the surface geostrophic flow of the sSO, thus the regional circulation varies in phase with the leading edge of sSO sea level variability. The surface forcing of changes in the sSO system is partly associated with variations of surface winds linked to the Southern Annular Mode, and is modulated by sea ice cover near Antarctica.
0094-8276
6024-6033
Naveira Garabato, A.C.
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Dotto, T.S.
437639c6-9c67-4c83-ace3-bb490a2f44d7
Hooley, J.
fc79a6b9-4c70-486a-9280-548d925d6945
Bacon, S.
1e7aa6e3-4fb4-4230-8ba7-90837304a9a7
Tsamados, M.
c206a0fe-e2c2-4853-9d71-4d3d9c882af5
Ridout, A.
33f88d9d-6f52-4a4e-b777-896215c10ffa
Frajka‐Williams, E.E.
2b2338d1-4a28-4785-9e13-c46c35a326b3
Herraiz‐Borreguero, L.
1ede25b2-c156-48cf-8bf6-83592b37d8f8
Holland, P.R.
1288654c-2b5b-4d4c-b360-7eebe59c7539
Heorton, H.D.B.S.
9daadd1c-f4e6-4087-a8b5-e57ec12bb1f6
Meredith, M.P.
25fd5f1c-f3ed-40a2-af59-5a7074a25fcd
Naveira Garabato, A.C.
97c0e923-f076-4b38-b89b-938e11cea7a6
Dotto, T.S.
437639c6-9c67-4c83-ace3-bb490a2f44d7
Hooley, J.
fc79a6b9-4c70-486a-9280-548d925d6945
Bacon, S.
1e7aa6e3-4fb4-4230-8ba7-90837304a9a7
Tsamados, M.
c206a0fe-e2c2-4853-9d71-4d3d9c882af5
Ridout, A.
33f88d9d-6f52-4a4e-b777-896215c10ffa
Frajka‐Williams, E.E.
2b2338d1-4a28-4785-9e13-c46c35a326b3
Herraiz‐Borreguero, L.
1ede25b2-c156-48cf-8bf6-83592b37d8f8
Holland, P.R.
1288654c-2b5b-4d4c-b360-7eebe59c7539
Heorton, H.D.B.S.
9daadd1c-f4e6-4087-a8b5-e57ec12bb1f6
Meredith, M.P.
25fd5f1c-f3ed-40a2-af59-5a7074a25fcd

Naveira Garabato, A.C., Dotto, T.S., Hooley, J., Bacon, S., Tsamados, M., Ridout, A., Frajka‐Williams, E.E., Herraiz‐Borreguero, L., Holland, P.R., Heorton, H.D.B.S. and Meredith, M.P. (2019) Phased response of the subpolar Southern Ocean to changes in circumpolar winds. Geophysical Research Letters, 46 (11), 6024-6033. (doi:10.1029/2019GL082850).

Record type: Article

Abstract

The response of the subpolar Southern Ocean (sSO) to wind forcing is assessed using satellite radar altimetry. sSO sea level exhibits a phased, zonally coherent, bi‐modal adjustment to circumpolar wind changes, involving comparable seasonal and interannual variations. The adjustment is effected via a quasi‐instantaneous exchange of mass between the Antarctic continental shelf and the sSO to the north, and a 2‐month‐delayed transfer of mass between the wider Southern Ocean and the subtropics. Both adjustment modes are consistent with an Ekman‐mediated response to variations in surface stress. Only the fast mode projects significantly onto the surface geostrophic flow of the sSO, thus the regional circulation varies in phase with the leading edge of sSO sea level variability. The surface forcing of changes in the sSO system is partly associated with variations of surface winds linked to the Southern Annular Mode, and is modulated by sea ice cover near Antarctica.

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Accepted/In Press date: 16 May 2019
e-pub ahead of print date: 23 May 2019
Published date: 16 June 2019

Identifiers

Local EPrints ID: 431594
URI: https://eprints.soton.ac.uk/id/eprint/431594
ISSN: 0094-8276
PURE UUID: f21f9fc9-5a76-4598-9c61-d67ccac4931c

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Date deposited: 10 Jun 2019 16:30
Last modified: 29 Nov 2019 17:32

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