Analysis and Diagnosis of a Local Heavy Rain in Miyun County, Beijing

Wang Yunchun; Qian Tingting; Zheng Yongguang; Tao Zuyu

Vol.14, NO.3, 2003

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2003 > 14(3): 277-286

Wang Yunchun, Qian Tingting, Zheng Yongguang, et al. Analysis and diagnosis of a local heavy rain in Miyun county, Beijing. J Appl Meteor Sci, 2003, 14(3): 277-286.

Citation:

Wang Yunchun, Qian Tingting, Zheng Yongguang, et al. Analysis and diagnosis of a local heavy rain in Miyun county, Beijing. J Appl Meteor Sci, 2003, 14(3): 277-286.

Wang Yunchun, Qian Tingting, Zheng Yongguang, et al. Analysis and diagnosis of a local heavy rain in Miyun county, Beijing. J Appl Meteor Sci, 2003, 14(3): 277-286.

Citation:

Wang Yunchun, Qian Tingting, Zheng Yongguang, et al. Analysis and diagnosis of a local heavy rain in Miyun county, Beijing. J Appl Meteor Sci, 2003, 14(3): 277-286.

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Analysis and Diagnosis of a Local Heavy Rain in Miyun County, Beijing

1.
Institute of Urban Meteorology, CMA, Beijing 100089
2.
Laboratory for Severe Storm Research, Department of Atmospheric Science, College of Physics, Peking University, Beijing 100871

Received Date: 2002-03-25
Rev Recd Date: 2002-07-10
Publish Date: 2003-06-30

Abstract

Abstract

Miyun, the northeast county of Beijing, had a local and short-time heavy rain on 1 August, 2002. The amount of precipitation reached 280.2 mm and the rain caused a mud-rock flow and flood fatality. Satellite cloud pictures show that this rain was triggered by a mseo-βconvective system which settled in the northern mountain area. The dense isoline region of TBB and the up-rushing cloud top indicate the rainfall area. The large-scale circulation shows that there was sinking motion, accompanying an inversion layer which restrained the convection and favored the accumulation of instable energy. During the rain process, the conversion from sinking to ascending made the convection possible. The large-scale analysis of water vapor indicates that there was abundant water vapor from the northwest of the subtropical high to Beijing. The result of surface mesoscale analysis shows that the mesoscale low and the convergence line are trigger factors for a mseo-βconvective system, and that the high-humidity and high-temperature airflow is in favorable of local heavy rains.
- Heavy rain;
- Diagnostic analysis;
- Mesoscale convective

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References(9)

Figures and Tables

图 1 北京市石城水文站8月1日19 :00~2日00 :00逐时雨量直方图

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图 2 8月1日红外云图的TBB等值线图 (a)18 :00，(b)19 :00，(c)20 :00，(d)21:00，(e)22 :00，(f)23:00

(单位:℃，图中给出了河北的省界和北京、天津的市界，密云位于北京东北部)

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图 3 (a)8月1日08 :00 500 hPa位势高度 (实线) 等温线 (虚线) 风矢量 (b)7月31日08:00 500 hPa垂直速度w (单位:cm/ s)(c)8月1日08 :00通过石城乡 (116.85°E，40.58°N) 的垂直速度 (细实线为正值，细虚线为负值，单位:cm/ s) 和相当位温 (粗实线，单位:K) 经向剖面 (d)8月1日08 :00 500 hPa垂直速度w (单位:cm/ s)

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图 4 850 hPa垂直运动 (虚线表示下沉运动，实线表示上升运动，单位:cm/ s)(a)7月31日08 :00 (b)8月1日08:00

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图 5 8月1日20 :00 850 hPa (a) 和700 hPa (b) 水汽通量散度 (实线辐散，虚线辐合，单位:10 ^-7 g/(s·hPa·cm2)) 和水汽通量矢量场

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图 6 200 hPa涡度平流 (虚线为负涡度平流，实线为正涡度平流，单位:10^-10s^-2)(a)7月31日20 :00 (b)8月1日20:00

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图 7 华北地区地面图

（a）1日17:00（b）1日20:00，（实线为等压线，间隔1 hPa；细虚线为等温线，间隔1 ℃；粗虚线为切变线；矢线为变线）（c）北京地形图（圆丙足况泥石流发生区域）

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表 1 7月31日08:00~8月1日08:00的各种静力稳定度参数

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