Statistical Studies on Anticyclogenesis in Japan and the Neighbouring Areas

[摘要] The original data were obtained from the weather maps analysed by the Central Meteorological Observatory, T_??_ky_??_. First, the iocitions where more than 550 travelling anticyclones originate were determined carefully and were tabulated during the 8-year period extenling 1933-1940. The frequencies were written for each 2° square of latitude and longitude (see Fig. 1). The place of origin of travelling highs seems to be influenced to some extent by the distribution of land and water. The principal area of origin may be roughly expressed as the eastern China.Next the travelling highs during the same period in Japanese area have been enumerated and their seasonal distribution is Winter 14.9, Spring 24_??_5, Summer 9.5. Autumn 21.9.Thus the frequency of the travelling highs which appear in our weather chart is rather high in Spring and Autumn.Next the total number of travelling highs that traversed each square, two degrees longitude in width and two degr es latitude in length, during the 8-year period were enumerated. Chart 3 and 4 were constructed according to this plan. The location of the composite tracks is determined on the ground that the axis of the region of greatest anticyclone frequency indicates the mean position of the anticyclone paths, which may be roughly summed up as three groups (see Fig. 3).

[学科分类] 大气科学