抄録
This paper describes a method of compiling the Kuroshio Current vector map from NOAA-6/AVHRR data, and aims at obtaining knowledge of the dynamics of oceanic currents and eddies. Through the compilation of the map, the following results were obtained. (1) A projection method of NOAA-6/AVHRR data to the 1:3, 000, 000 scaled map entiled "Japan and Its Surroundings" produced by Geometrical Survey Institute was worked out. This method allows for keeping a geometrical accuracy of 1% or less distortion at any portion in the mapping range of about 2, 000 x 3, 000 km2. (2) Continuous colour display from B&W imagery was developed. Oceanic currents and eddies can be recognized more effectively in this display than in conventional displays such as colour sliced ones. (3) The Kuroshio current vector map gives us the differences in the sea surface temperature over wide area, patterns of oceanic currents, and also sea bottom topography. All of this information is given on one photo. (4) A method of measuring current velocities using corresponding sea marks on time serial scenes was developed. With this method a measuring accuracy of 0.1 knots or less can be obtained. This method can be used to measure the angular velocity of oceanic eddies (this is attained by measuring twin current velocities on the sea surface at the eddy's center).
Next, the following items of oceanic currents and eddies are discussed using some hydrodynamical model tests. (1) To strengthen the oceanic current chart provided by the Maritime Safety Board. (2) Oceanic eddies distributed in the surroundings of Japan Islands and their hydrodynamical features. (3) Observation of meandering in a very short period along the Kuroshio and its characteristics.
