AN ANALYSIS ON DEVELOPMENT OF MESO-Β CONVECTIVE SYSTEM ALONG MEIYU FRONT ASSOCIATED WITH FLOOD IN WUHAN IN 20-21 JULY 1998

Zhang Xiaoling; Tao Shiyan; Zhang Qingyun

Vol.13, NO.4, 2002

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2002 > 13(4): 377-396

Zhang Xiaoling, Tao Shiyan, Zhang Qingyun. An analysis on development of meso-β convective system along Meiyu front associated with flood in Wuhan in 20-21 July 1998. J Appl Meteor Sci, 2002, 13(4): 377-396.

Citation:

Zhang Xiaoling, Tao Shiyan, Zhang Qingyun. An analysis on development of meso-β convective system along Meiyu front associated with flood in Wuhan in 20-21 July 1998. J Appl Meteor Sci, 2002, 13(4): 377-396.

Citation:

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AN ANALYSIS ON DEVELOPMENT OF MESO-Β CONVECTIVE SYSTEM ALONG MEIYU FRONT ASSOCIATED WITH FLOOD IN WUHAN IN 20-21 JULY 1998

The Institute of Atmospheric Physics Chinese Academy of Sciences, Beijing 100029

Received Date: 2001-01-09
Rev Recd Date: 2001-04-30
Publish Date: 2002-08-31

Abstract

Abstract

On 21 July 1998 a flash flood associated with a meso-β convective system occurred in Wuhan, producing 88 mm rainfall in an hour. A diagnostic study of the genesis and development of the mesoscale convective system (MCS) is presented. The conclusions are as follows: (1) The flash flood occurred during the rapidly developing stage of the MCS. (2) There was aboundent moisture gathered in the lower troposphere and the atmosphere was nearly saturated with a big store of convective available potential energy (CAPE). (3) The MCS became nearly stationary in the vicinity of Wuhan after formed and a great amount of rainfall was accumulated in this area.
- Flash flood;
- MCS;
- CAPE

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References(13)

Figures and Tables

图 1 1998年7月20~22日武汉及其附近地区的降水逐时演变图

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图 2 湖北省东部地形图 (等高线单位:m)

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图 3 1998年6~8月100°~120°E范围平均的整层水汽输送通量qV(单位:g·m-1·s^-1) 和TBB (阴影表示TBB＜-10 ℃) 时间-纬度剖面图

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图 4 1998年6~8月沿30°N的600 hPa的涡度时间-经度剖面 (单位:10^-6s^-1)

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图 5 1998年7月20日20:00(a)~21日08:00(b)T-lnp图

(点线为露点温度曲线；实线为层结曲线；虚线为绝热过程曲线)

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图 6 1998年7月21日05:00GMS红外云图

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图 7 1998年7月21日MB红外增强云图

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图 8 1998年7月21日02:00~14:00每3 h-次的平均亮度温度（TBB）分布图

(阴影区为对应时间的1h降水（间隔为10 mm)；TBB (℃) 的精度为0.25*×0.25*；◆表示武汉的位置)

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图 9 1998年7月21日08:00沿30°N各种物理量垂直剖面

(a) 涡度ζ(×10^-5 s^-1)，(b) 位涡度 (×10^-6kg^-1·m·s^-1)，(c) 散度 (×10^-5s^-1)，(d) 垂直速度w(×10^-1hPa·s^-1)，(e) 相对湿度 (%)，(f) 相当位温θ_e(K)(阴影区表示地形高度)

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图 10 “98.7”暴雨的中-β尺度对流系统发生的概略图

(a) 大尺度环境场，(b) 中-β尺度系统的平面结构，(c) 垂直结构

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