The relationship of current fluctuations on the Southeast United States shelf to fluctuations of the wind and gulf stream and the East China Sea analog |
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| Authors: | Mark Wimbush Li Li |
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| Institution: | (1) Graduate School of Oceanography, University of Rhode Island, Narragansett, U.S.A.;(2) Third Institute of Oceanography, SOA, Xiamen, China |
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| Abstract: | Sub-tidal (1.04–25 day) current fluctuations during winter/spring on the continental shelf off Savannah, Georgia (32°N) and
off St. Augustine, Florida (30°N) were compared with records of local wind stress components and GulfStream position. (Acoustic
travel time and bottom pressure measurements at stations on the continental slope were combined to determine main, thermocline
depth, as an indicator of Gulf Stream displacement). Relative wind influences increased towards the coast. GulfStream influence
increased towards the shelf-break and towards the surface. Off Savannah, the Gulf Stream influence was predominately at 12
day period and was negligible at the 45 m isobath. Off St. Augustine, its influence was predominately at 4 day period and
was appreciable at the 40 m isobath (but negligeable at the 28 m isobath). Linear predictions of currents from wind and Gulf
Stream account for ∼80% of the observed variance. Similar methods of studying and predicting the wind—and Kuroshio-influenced
currents on the East China Shelf are proposed. |
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