ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 39 Issue 11 > 2013,39(11):1385-1392. DOI:10.7519/j.issn.1000-0526.2013.11.001 Prev Next
Statistical Analysis of Mesoscale Convective System in the Context of Cold Vortex
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Abstract:
Cold vortex is identified based on the definition of cold vortex, and 60 cold vortexes are identified in 2005-2011, formed mainly in the northeastern region of China and Mongolia. According to the size, the mesoscale convective system (MCS) is classified into meso α scale convective system (MαCS) and meso β scale convective system (MβCS). Then, MαCS is classified into mesoscale convective complex (MCC) and persistent elongated convective system (PECS), while MβCS into meso β scale convective complex (MβCC) and meso β elongated convective system (MβECS). Based on the FY 2 geostationary satellite infrared images the MCS is identified and its spatial temporal features and its relationship with the 60 cold vortexes are analyzed. The result reveals: (1) 61 MCSs are identified; MCS usually appears in Northeast China and North China; MCC and PECS are generated more decentralized. MβCC mainly concentrates in Northeast China and North China and MβECS mainly in Northeast China. (2) MCS in June is the most and in September the least. Most MCSs are produced in the afternoon and dusk when the convection is prosperous and conducive to production of MCS. MCS gets matured at night and dissipates in the early morning. (3) Most MCSs move from west to east, consistent with the motion of westerlies weather system in middle latitude in China. However due to the impact of cold vortex and other weather systems, there exist different moving paths. The MCS located in the east of cold vortex and near the cold vortex center has the trend of moving easterly and northerly; the MCS in the south of cold vortex and far from the cold vortex center has the trend of moving east southeast. (4) Most MCSs are generated in the developly stage of cold vortex. (5) MCS is mainly produced in the southeast of cold vortex. (6) MβCSs develop faster than MαCSs, and the lasting time is shorter than MαCSs.
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