FEATURES OF WATER VAPOR TRANSPORT OF TYPHOON DAN (9914)

【Abstract】 The 2.5×2.5 gridded ECMWF reanalysis data are used to diagnose the genesis, developmentand dissipation of typhoon Dan by calculated stream function, velocity potential and vapor budget. It is shown inthe result that when typhoon Dan moved westwards, water vapor mainly came from the eastern and westernboundaries, with most of it was transferred by the easterly flow south of the western North Pacific subtropicalhigh; after Dan swerved northwards, water vapor mainly came from western boundary of the typhoon, and thevapor came from the South China Sea and the Indian Ocean. The transfer of water vapor was mainlyconcentrated on the mid-lower troposphere, especially the level of 925hPa, at which the most intensive transferbelt was located. During the different period of typhoon Dan, there was great water vapor change as indicated bystream function, velocity potential and vapor budget, which suggest the importance of water vapor in thedevelopment of typhoon Dan.更多还原