To clasify a seasonal decay of the Ogasawara anticyclone, or the Western Pacific anticyclone, from summer to autumn in the troposphere, the variation of certain isothickness lines, 5, 700 and 5, 800gpm lines, on the 5-day mean thickness chart (1, 000-500mb), was used. It was found that the line of 5, 700gpm is located in the northern part from Japan, and the area surrounded by a certain line of 5, 800gpm covers widely in summer over the Western Pacific on which the Ogasawara anticyclone develops, but in autumn, the line of 5, 700gpm moves toward the south, and reaches the Japan Islands, and then 5, 800gpm line retrogresses to the China Continent, and doesn't come over the Western Pacific again. To study the situation in the stratosphere corresponding to such a tropospheric seasonal transition, the phenomenon of the disappearance of a polar anticyclone surrounded by a certain contour, 31, 760gpm, on the 10mb level, was considered.
It was found that the disappearance occurs approximately 25 days prior to the decay of the Ogasawara anticyclone in the troposphere.
It was found, moreover that the first day of the disappearance or weakening of a polar anticyclone on the 10mb level corresponds to the date on which the closed high surrounded by a certain contour on the 100mb level located in the eastern part of the anticyclone over Southern Asia begins to stagnate over near Japan, and the Ogasawara anticyclone suddenly decays when the closed high cell starts to move eastward.