Analysis of Dynamic and Thermal Mechanism of Heavy Precipitation over the Yangtze-Huaihe River Basin Caused by a Qinghai-Xizang Plateau Vortex Moving Eastward

Using ERA5 （0.25°×0.25°） hourly reanalysis data， TRMM satellite precipitation data and FY-2E satellite black-body temperature （TBB） data， the circulation background and movement characteristics of the formation and development of a Qinghai-Xizang Plateau vortex （QXPV） moving out of the Tibetan Plateau from July 7 to July 9， 2017， as well as the dynamical and thermal mechanism of the heavy precipitation in the Yangtze-Huaihe River Basin were discussed， and the HYSPLIT4 model was used to track the water vapor source of the heavy precipitation in the Yangtze-Huaihe River Basin.The results show as follow： The QXPV was generated in the central part of the Tibetan Plateau， first moved to the southeast and then to the northeast after reaching the central part of Sichuan， with the life history of 39 h.At 200 hPa， the South Asian High and the upper-level jet stream were strong， and the vortex was located in the divergence region on the right side of the upper-level jet inlet area， which promoted the formation and deve