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Surface currents during NORCSEX'88, as measured by a land- and a ship-based HF-radar

IGARSS'89 Proceedings, Vol.2, pp. 730...733, 1989.
Abstract - - CODAR (COastal raDAR) measurements of surface currents, carried out during NORCSEX'88, are presented. One land- and one ship-based station were used, in order to map the two-dimensional current of the Norwegian coast at about 64 degree N and 8 degree E in March 1988.

The ship-based CODAR system, developed by the University of Hamburg, is new and discussed in some detail. Errors due to angular resolution by means of an array of four receiving antennas, determination of the ship's drift by satellite navigation GPS (Global Postion System) and pitch- and roll-motions of the ship sum up to about 10 cm/s. This value is corroberated by the comparison of current velocities measured by the land- and ship-based system at the same position.

Surface currents observed show a high temporal and spatial variability on scales of several hours and some km, respectively. Temporal variations are obviously due to wind. The horizontal variability of the Norwegian Coastal Current is well known from satellite images. The underlying mechanisms are complex and not yet understood.
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