寒冬時と暖冬時の日本近海の海上風について

概要

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It seems for us to have more and more colder or warmer winters in these days. This Paper studied about the wind over sea near Japan in colder and warmer winters, respectively for Jan., Feb., of 1974 and 1977 and of 1969 and 1979. The difference and the characteristic of the wind speed between the two cases and their distributions were studied. Frictional coefficient, and unstable coefficient due to sea and air temperature difference were taken into account to calculate the wind speed, after getting gradient wind or geostrophic wind from weather charts. The observational wind speeds by ship were compared with the theoretical ones to check if they would coincide. The results are as follows. First, the maximum wind speed area is extending along 33°〜36°N of mid-latitude in colder winters. So, the other strong wind area is appeared near Japan as cyclones are apt to pass by it in warmer winters. Secondly, when Zonal Index is high, strong wind area is in the east from 160°E. When it is low, the area moves to west.
社団法人日本航海学会の論文
1984-01-25