Free Content Anomalous diurnal tidal currents on the Yermak Plateau

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Abstract:

Recent observations made over the Yermak Plateau, a 100 × 200 km submarine feature northwest of Svalbard, show that ocean currents in that area are dominated by diurnal tidal currents although semidiurnal tidal displacements of the surface always exceed diurnal tidal displacements along the coast in the Arctic Ocean. Currents were recorded with meters suspended below two drifting ice stations, FRAM III in 1981 and FRAM IV in 1982, as they traveled over several weeks from a region of abyssal depths onto the western flank of the Yermak Plateau. Ice drift velocity was calculated from satellite positions and then vectorially added to the recorded data to produce current velocity relative to the bottom. Diurnal tidal currents with spectral peaks greater than semidiurnal peaks were observed in both years with current speeds reaching 30 cm/s over the edge of the Plateau. Semidiurnal tidal currents over the middle and lower slope were principally alongslope which is consistent with Kelvin wave motion. Diurnal tidal currents on the middle and lower slope were across-slope, and on the upper slope they had a clockwise rotary motion suggestive of topographic vorticity waves. These unusually large diurnal tides are apparently vorticity waves which have been resonantly forced by weak deep-sea diurnal tides.

Document Type: Research Article

DOI: http://dx.doi.org/10.1357/002224086788460139

Publication date: February 1, 1986

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  • The Journal of Marine Research publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. In the area of biology, studies involving coupling between ecological and physical processes are preferred over those that report systematics. Authors benefit from thorough reviews of their manuscripts, where an attempt is made to maximize clarity. The time between submission and publication is kept to a minimum; there is no page charge.
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