关键词: 东北冷涡, 连续雷雨, 数值模拟

Abstract: Based on the CDAS-NCEP/NCAR reanalysis data, a sequence thunderstorm process caused by northeast cold vortex from 9 to 12 July, 2005 was simulated by mesoscale model MM5V3-7 of Penn state/NCAR. The local storm process in Shenyang and the surrounding areas on 9th July, 2005 was analyzed, and the evolution of β mesoscale convective system and its structure features were discussed. The results indicate that cold vortex always has a biggish bound cold air pool in middle and high level. On the southeast side of cold vortex, the margin area of high level dry and cold pool takes on erect shape from boundary layer to troposphere layer. It indicates that there exists a strong convection. Warm and wet air flow in lower level below the margin areas of dry and cold pool plays an important role in the local strong convection of cold vortex. The up layer and down layer of S_e in margin areas of dry and cold pool can approach or get through when the local convection develops.