急激に発達した台風(T8305)の人工衛星赤外画像に現われた特徴について

Abstract

Infrared images of the Geostationary Meteorological Satellite II (GMS II) of Typhoon8305, Abby, which developed lower than 900 mb, are analyzed with special interest on development of the typhoon eye. This typhoon first appeared at 9 N, 144 E on Aug. 4, 1983. It de-veloped to 895 mb at 17 N, 132 E. Clear eye was seen from Aug. 7 to Aug. 15 justbefore landing on the central Japan. The formation of eye in the center of the typhoon coincideswith rapid development of its central pressure. The lowering speed of the cloud top of the eyecenter is about 0.4 m/sec. After the cloudless eye is formed, the time changes of the central pres-sure is almost proportional to the time change rate of the area of cloudless eye area. The centraldense overcast (CDO) has spiral structure connecting to the spiral rain band outside. How-ever, the angle of the spiral decreases with radius in CDO.