Numerical simulation of symmetric instability on Meiyu front torrential rain

According to the Kuo-Anthes vertical convection and Nordeng slantwise convection parameterization scheme, a vertical-slantwise convection integrated parameterization scheme is designed and introduced into the MM5 model. Using the integrated scheme, a process of large scale strong precipitation in the Yangtze River Basin in June 1999 is simulated and tested sensitively. Results show that the intensity and location of precipitation are improved effectively, the vertical circulation forms quickly and intensifies, and the simulated result is close to the observation when the slantwise convective parameterization is introduced into MM5. The result illustrates the necessity of considering the slantwise convention in torrential rain simulations for the symmetric instability weather system.