太平洋熱帯域での擾乱の発生について

Abstract

Tropical wave disturbances which later developed into tropical storms over the equatorialPacific were analyzed using the satellite wind data and the rawin sonde wind data in July andSeptember, 1980. There were 10 tropical storms during these two months in the western Pacificand 5 of them were analyzed from the initial wave disturbances. Four out of five tropical stormswere developed from the easterly wave disturbances, which traveled with easterly wave along1ON from 150W in the eastern Pacific. There often existed the Mid Pacific Trough around160W, 30N. With the westward movement of easterly wave disturbances, the upper cold lowswere cut off from the Mid Pacific Trough and moved westward along 20N. These tropicalstorms in the western Pacific and in the eastern Pacific around 110W were both developed intotropical storms when they encountered the ascending motion area of the zonal circulation cells.