ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 39 Issue 2 > 2013,39(2):180-185. DOI:10.7519/j.issn.1000-0526.2013.02.006 Prev Next
Statistical Analysis of MCS in Summer in Central Eastern China
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Abstract:
There are less classification studies on mesoscale convective system (MCS) at present. Based on the FY 2 geostationary satellite infrared digital cloud images during summer time （June-August） of 2008-2010, the space and time characteristics of MCS were investigated in central eastern China (27°-40°N, 110°-124°E). According to the size, the classification scheme used for this study includes two previously defined categories: meso α scale convective system (MαCS) and meso β scale convective system (MβCS). Then on the basis of the shape, MαCS can be classified into mesoscale convective complex (MCC) and persistent elongated convective system (PECS), and MβCS can be classified into meso β circular convective system (MβCCS) and meso β elongated convective system (MβECS). The results have revealed that there are 208 MCSs in summer during the three years, including 68 MαCSs and 140 MβCSs. Elongated systems accounted for 79.3% of the total MCS sample that indicates the elongated system is the most common type of MCS in summer in this region. On monthly variation view, there are most MCSs in July, the second in August, and the least in June. On the whole, most MCSs move from the west to the east and some from the south to the north or the north to the south. There is also the least path of the east to the west. The peak time of MCS initiation is between 09:00 and 10:00 UTC, and the MCSs reach their maximum size mainly between 10:00 and 11:00 UTC. Most of the system dissipate between 12:00 and 13:00 UTC. The life scale of MCS is about 6.5 hours. MαCSs from the initiation to mature stage need about three to four hours, while from mature to termination phase should last for about four to five hours. And for MβCSs, the development and weakening stages have the same time about two to three hours.
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