佐渡沖冷水域の海洋學的性状-I
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概要
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1) Several low temperature regions, which play big roll in fisheries, were found in the Sea of Japan during the simultaneous observation conducted in the summer (late July to early August) of 1591. This paper deals with the oceanographic character and the year-to-year shifting of the locations of these regions, especially the one located off Sado Island. 2) The results of the above observation indicate that within the low temperature region off Sado Island the water had the intermediate character between the water cold and the warm ocean currents distribution in the adjacent areas, and that the surface water of the cold current from the north was laterally mixing in this region with the subsurface water of the warm Tsushima Current from the south. As the bottom water of the Sea of Japan has been considered the mixture of these two waters, this region may be said to be one of those regions where the surface water of the cold current is converted into that bottom water. In that it is caused by the lateral mixing of two currents, this low temperature region differs from other similar regions in the Sea of Japan or off Kii Peninsula which are caused by the upwelling of the deep water. 3) Owing to the presence of this mixing region, the subsurface water of the Tsushima Current is deprived of much of its original properties in the north of Noto peninsula. 4) The location and the degree of development of this mixing region depend on the fluctuating strengths of the cold and the warm currents, and therefore are subject to considerable seasonal and annual variations. There are some indictions that it is best developed in spring.
- 公益社団法人 日本水産学会の論文