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An anticyclonic circulation above the Northwest Georgia Rise, Southern Ocean

Meredith, Michael P.; Watkins, Jon L.; Murphy, Eugene J.; Cunningham, Nathan J.; Wood, Andrew G.; Korb, Rebecca; Whitehouse, Mick J.; Thorpe, Sally E.; Vivier, Frédéric. 2003 An anticyclonic circulation above the Northwest Georgia Rise, Southern Ocean. Geophysical Research Letters, 30 (20), 2061. 4, pp. 10.1029/2003GL018039

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Abstract/Summary

Data from a variety of sources reveal a warm-core anticyclonic circulation above the Northwest Georgia Rise (NWGR), an similar to2000-m high bathymetric feature north of South Georgia. The sense of the circulation is opposite to the general cyclonic flow in the Georgia Basin. The circulation shows the characteristics of a stratified Taylor column: dimensional analysis shows that the local bathymetry and hydrography are conducive to the formation of such. ERS2 altimeter data show that the column, whilst not fully permanent, is nonetheless a recurring feature. High concentrations of chlorophyll-a are observed at the centre of the circulation, indicating that the modulation of the physical environment has significant consequences for the local biogeochemical system via enhanced primary production. Enhanced chlorophyll-a extends in a long plume from the NWGR along pathways indicated by drifters; this passive redistribution may have consequences for the larger (basin-) scale ecosystem.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2003GL018039
Programmes: BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Dynamics and Management of Ocean Ecosystems
ISSN: 0094-8276
NORA Subject Terms: Marine Sciences
Date made live: 22 Feb 2012 08:56
URI: http://nora.nerc.ac.uk/id/eprint/12778

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