Seasonal and interannual changes in the North Atlantic subpolar gyre from Geosat and TOPEX/POSEIDON altimetry

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Heywood, K. J. ORCID: https://orcid.org/0000-0001-9859-0026 (1995) Seasonal and interannual changes in the North Atlantic subpolar gyre from Geosat and TOPEX/POSEIDON altimetry. Journal of Geophysical Research, 100 (C12). pp. 24931-24941. ISSN 0148-0227

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Abstract

Sea surface slopes from the altimetric satellites Geosat and TOPEX/POSEIDON are used to calculate eddy kinetic energy of the North Atlantic subpolar gyre (40-65°N, 60°-5°W). In regions of strong currents the eddies are driven by baroclinic instability of the mean flow, are not seasonally varying, and may therefore be used as a surrogate for the mean flow itself. Wind stress curl fields for the same periods show that the northward and southward shifts in the current branches across the Mid-Atlantic Ridge are related to interannual differences in the winter wind stress curl pattern when the zero in wind stress curl is well defined and wind stress is at a maximum. Outside the NAC, the eddies are driven primarily by wind stress, indicated by a significant seasonality. Time series of eddy kinetic energy and wind stress are generated for the four years, and the magnitude, phase, and significance of annual and semiannual signals are determined. -from Authors

Item Type:	Article
Uncontrolled Keywords:	geophysics,forestry,oceanography,aquatic science,ecology,water science and technology,soil science,geochemistry and petrology,earth-surface processes,atmospheric science,earth and planetary sciences (miscellaneous),space and planetary science,palaeontology ,/dk/atira/pure/subjectarea/asjc/1900/1908
Faculty \ School:	Faculty of Science > School of Environmental Sciences University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups:	Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	LivePure Connector
Date Deposited:	20 May 2020 00:14
Last Modified:	20 Mar 2023 11:33
URI:	https://ueaeprints.uea.ac.uk/id/eprint/75241
DOI:

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