Variability of the Ross Gyre, Southern Ocean: Drivers and responses revealed by satellite altimetry

Dotto, Tiago S., Naveira Garabato, Alberto, Bacon, Sheldon, Tsamados, Michel, Holland, Paul R., Hooley, Jack, Frajka-Williams, Eleanor, Ridout, Andy and Meredith, Michael P. (2018) Variability of the Ross Gyre, Southern Ocean: Drivers and responses revealed by satellite altimetry. Geophysical Research Letters, 45 (12). pp. 6195-6204. ISSN 0094-8276

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Abstract

Year-round variability in the Ross Gyre (RG), Antarctica, during 2011–2015, is derived using radar altimetry. The RG is characterized by a bounded recirculating component and a westward throughflow to the south. Two modes of variability of the sea surface height and ocean surface stress curl are revealed. The first represents a large-scale sea surface height change forced by the Antarctic Oscillation. The second represents semiannual variability in gyre area and strength, driven by fluctuations in sea level pressure associated with the Amundsen Sea Low. Variability in the throughflow is also linked to the Amundsen Sea Low. An adequate description of the oceanic circulation is achieved only when sea ice drag is accounted for in the ocean surface stress. The drivers of RG variability elucidated here have significant implications for our understanding of the oceanic forcing of Antarctic Ice Sheet melting and for the downstream propagation of its ocean freshening footprint.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 27 Jul 2021 00:04
Last Modified: 18 Aug 2021 11:38
URI: https://ueaeprints.uea.ac.uk/id/eprint/80761
DOI: 10.1029/2018GL078607

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