MCS Census and Modification of MCS Definition Based on Geostationary Satellite Infrared Imagery

Fei Zengping; Zheng Yongguang; Zhang Yan; Wang Hongqing

Vol.19, NO.1, 2008

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2008 > 19(1): 82-90

Fei Zengping, Zheng Yongguang, Zhang Yan, et al. MCS census and modification of MCS definition based on geostationary satellite infrared imagery. J Appl Meteor Sci, 2008, 19(1): 82-90.

Citation:

Fei Zengping, Zheng Yongguang, Zhang Yan, et al. MCS census and modification of MCS definition based on geostationary satellite infrared imagery. J Appl Meteor Sci, 2008, 19(1): 82-90.

Fei Zengping, Zheng Yongguang, Zhang Yan, et al. MCS census and modification of MCS definition based on geostationary satellite infrared imagery. J Appl Meteor Sci, 2008, 19(1): 82-90.

Citation:

Fei Zengping, Zheng Yongguang, Zhang Yan, et al. MCS census and modification of MCS definition based on geostationary satellite infrared imagery. J Appl Meteor Sci, 2008, 19(1): 82-90.

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MCS Census and Modification of MCS Definition Based on Geostationary Satellite Infrared Imagery

1.
Department of Atmospheres Science, School of Physics, Peking University, Beijing 100871
2.
National Meteorological Center, Beijing 100081

Received Date: 2007-01-11
Rev Recd Date: 2007-07-03
Publish Date: 2008-02-29

Abstract

Abstract

MCSs (mesoscale convective systems) are significant weather systems causing heavy rain and other severe weather events during the warm season, which are very difficult to forecast in operation. Geostationary satellite infrared imagery with higher spatial and temporal resolution can provide much available information for MCS surveillance and forecasting. Since Maddox defined the MCCs (mesoscale convective complexes) based on enhanced satellite IR imagery, there are many detailed studies on the MCSs, but these studies revealed that Maddox's MCC definition is too strict. Then the MCS definition based on satellite imagery is always modified. In recent years, some studies classified MCS to MαCS (meso-α convective system) and MβCS (meso-β convective system). But because the definition of MCS based on satellite imagery is not uniform, it is very hard to compare various results of MCS census. First, the progress of MCS census research is reviewed, and the smallest horizontal scale of MβCS (meso-β convective system) is modified as that the diameter of cold cloud continuous area of TBB value≤-32 ℃ is more than 20 km. Secondly, based on the new definition of MβCS, the mesoscale convective systems are investigated over the Huaihe River Basin utilizing GOES-9 satellite IR imagery during June 21—July 22 2003, the results reveal that there are 10 MαCSs and 24 MβCSs. Comparing the definition of MβCS with that in the study of Ma et al, there are 7 MβCSs which can not satisfy the MβCS definition of Ma et al, and 6 of them lead to heavy rain over Huaihe River Basin. It shows that the new MβCS definition can better reveal the relationship between heavy rain and MCSs over the Huaihe River Basion. Finally, the other three typical MβCSs which produced heavy rainfall over Beijing are analyzed, Shalan Town of Heilongjiang Province, and Shanghai. The diameter of these three MβCSs is about 20—150 km, so they satisfy the new MβCS definition, but do not satisfy the MβCS definition of Ma et al. The results reveal that the new MβCS definition is very helpful to investigate and forecast the MCSs producing severe weather events in China.
- satellite IR imagery;
- MCS;
- definition;
- modification

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References(25)

Figures and Tables

图 1 2003年7月6日08:00的24 h降水

（单位:mm; 箭头线为第17号MβCS的移动路径）

Fig. 1 24-hour precipitation at 08:00 on July 6, 2003

（unit:mm; the black thick line with arrow head is 17# MβCS path）

DownLoad: Full-Size Img PowerPoint

图 2 2004年7月10日14:00—20:00北京地区降水量分布图^①

（单位:mm）

Fig. 2 The precipitation over Beijing during 14:00—20:00 on July 10, 2004 ^①

（unit:mm）

DownLoad: Full-Size Img PowerPoint

图 3 2004年7月10日14:00 GOES-9红外TBB分布

（单位:℃）

Fig. 3 GOES-9 IR TBB distribution at 14:00 on July 10, 2004

（unit:℃）

DownLoad: Full-Size Img PowerPoint

图 4 2005年6月10日11:00—14:00 FY-2C红外TBB分布

(黑色三角为宁安市, 单位:℃)

Fig. 4 FY-2C IR TBB distribution at 11:00—14:00 on June 10, 2005

(the black triangle denotes Ning'an City, unit:℃)

DownLoad: Full-Size Img PowerPoint

图 5 2004年7月12日15:25—18:49 GOES-9红外TBB分布

（单位:℃）

Fig. 5 GOES-9 IR TBB distribution at 15:25—18:49 on July 12, 2004

（unit:℃）

DownLoad: Full-Size Img PowerPoint

表 1 Maddox的MCC定义^[2]

Table 1 Maddox's definition of MCC^[2]

表 2 MCC判断标准的修改之一^[10]

Table 2 The first modified MCC definition^[10]

表 3 MCC判断标准的修改之二^[7]

Table 3 The second modified MCC definition^[7]

表 4 马禹等^[8]与陶祖钰等^[17]的MαCS和MβCS普查标准

Table 4 The definition of MαCS and MβCS in studies of Ma et al^[8] and Tao et al^[17]

表 5 MαCS普查标准的修订^[18]

Table 5 Modified MαCS def inition^[18]

表 6 MαCS和MβCS普查标准的修订^[19]

Table 6 Modified definitions of MαCS and MβCS^[19]

表 7 2003年淮河大水期间MCS普查列表

Table 7 MCS occurrences during the period of flooding over Huaihe River Basin in 2003

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