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Detailed Reference Information |
Hooker, S.B. and Brown, J.W. (1994). Warm core ring dynamics derived from satellite imagery. Journal of Geophysical Research 99: doi: 10.1029/94JC02171. issn: 0148-0227. |
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A reinterpretation of the life history of warm core ring 82-B is constructed from drifter trajectories, hydrographic profiles, and satellite-derived sea surface temperature fields. An analysis of the observations strongly suggests this ring is fundamentally a dipole structure for much of its existence. The dipole has unequal strength vortices, with the cyclone being the weaker component. Quantification of the dipole indicates the anticyclone is oval shaped and rotates at approximately 7.7¿ per day, while the cyclone revolves around the anticyclone at about 14.5¿ per day, yielding an orbit period of approximately 25 days for the cyclone. The elusive part of the dipole explanation is in interpreting its surfacae signature as a function of time, as the cyclone appears to diappear when in proximity to the steep continental slope. Vortex modeling suggests that when the weaker cyclonic eddy is placed close to a boundary, the cyclone is drawn into a filament as it is advected through the gap between the anticyclone and the boundary. This means the cyclone is either in a filamentation state or undergoing the straining associated with filamentation approximately three fourths of the time, which is in complete agreement with the satellite imagery. In addition, the 82--B dipole configuration is sufficiently robust to survive continuous interaction with the continental slope and the onset of a Gulf Stream interaction. Although only warm core ring 82-B is anlayzed in detail (and found to be a vortex pair), dipole configurations are found in the warm core ring 81-F time series as well. ¿ American Geophysical Union 1994 |
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Abstract |
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Keywords
Oceanography, Physical, Eddies and mesoscale processes, Oceanography, Physical, Fronts and jets, Oceanography, Physical, Western boundary currents, Oceanography, General, Remote sensing and electromagnetic processes |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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