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Near-surface circulation over the Yermak plateau in northern Fram Strait
Manley, T.O.; Bourke, R.H.; Hunkins, K.L. (1992). Near-surface circulation over the Yermak plateau in northern Fram Strait. J. Mar. Syst. 3(1-2): 107-125
In: Journal of Marine Systems. Elsevier: Tokyo; Oxford; New York; Amsterdam. ISSN 0924-7963; e-ISSN 1879-1573, meer
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| Auteurs | | Top |
- Manley, T.O.
- Bourke, R.H.
- Hunkins, K.L.
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| Abstract |
Using hydrographic data collected over an 11-year period, a view of the circulation pattern existing in the upper 40 m over the Yermak Plateau of northern Fram Strait is presented. Past work has indicated that the primary influx of Atlantic Water into the central Arctic Ocean is accomplished via a single narrow current that borders the northern coast of Svalbard. Volumetric analysis of the available hydrographic data has shown the presence of a shallow, previously undocumented plume of Atlantic-derived water entering the Arctic Ocean directly over the Litke Trough. This plume represents one part of a large, near-surface (predominant in the upper 20 m) mushroom-shaped salinity-defined dipole structure that has a lateral extent of some 450 km. The eastern vortex of this dipole is poorly documented due to a lack of data-coverage but, the better documented western limb of the dipole, which is the central topic of this paper, represents a recirculated filament of modified Atlantic Water that moves cyclonically around the periphery of the Yermak Plateau. T - S analysis of the original data and the use of a simplified model depicting the evolving T - S properties of Atlantic Water as it interacts with the atmosphere and ice cover support this view. Additionally, over the larger-scale distribution fields of salinity (which primarily defines density) and dynamic height, a well defined front in both salinity and dynamic height is observed 200-500 km north of Svalbard trending east northeast. |
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