ANALYSIS ON THE ENVIRONMENTAL CONDITIONS AND DYNAMIC TRIGGER MECHANISM OF A SEVERE CONVECTIVE RAINSTORM IN BEIJING

Li Zhinan; Li Tingfu

Vol.11, NO.3, 2000

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2000 > 11(3): 304-311

Li Zhinan, Li Tingfu. Analysis on the environmental conditions and dynamic trigger mechanism of a severe convective rainstorm in Beijing. J Appl Meteor Sci, 2000, 11(3): 304-311.

Citation:

Li Zhinan, Li Tingfu. Analysis on the environmental conditions and dynamic trigger mechanism of a severe convective rainstorm in Beijing. J Appl Meteor Sci, 2000, 11(3): 304-311.

Li Zhinan, Li Tingfu. Analysis on the environmental conditions and dynamic trigger mechanism of a severe convective rainstorm in Beijing. J Appl Meteor Sci, 2000, 11(3): 304-311.

Citation:

Li Zhinan, Li Tingfu. Analysis on the environmental conditions and dynamic trigger mechanism of a severe convective rainstorm in Beijing. J Appl Meteor Sci, 2000, 11(3): 304-311.

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ANALYSIS ON THE ENVIRONMENTAL CONDITIONS AND DYNAMIC TRIGGER MECHANISM OF A SEVERE CONVECTIVE RAINSTORM IN BEIJING

Beijing Meteorological Observatory, Beijing 100089

Received Date: 1999-03-14
Rev Recd Date: 1999-10-07
Publish Date: 2000-08-01

Abstract

Abstract

Through the analysis of a severe convective rainstorm occurring in a synoptic-scale ridge on June 29, 1998 in Beijing, it is found that the interaction of the middle-level ridge, low-level convergence system and surface cold air produced a meridional circulation in the lower and middle atmosphere which stored up instability energy and maintained the ascending motion in the storm area. Dynamic frontogenesis was formed in the ground layer and intensified the latent instability at the lower and middle levels. Moreover, the positive vorticity advection of short wave disturbance in the upper troposphere initiated the ascending motion at the upper level and the releasing of the latent instability by ageostrophic balance processes. The short wave disturbance did not match the undulation of the wind field, and the characteristics of its phase propagation were similar to those of gravity waves.
- Severe convective rainstorm;
- Environmental conditions;
- Short wave disturbance;
- Trigger mechanism

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References(6)

Figures and Tables

图 1 1998年6月29日20:00~30日14:00雨量 (mm) 分布

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图 2 1998年6月29~30日南郊观象台 (阴影区)、通县 (黑直方区) 的雨量和扰动气压时间变化图

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图 3 1998年6月29日20:00 850 hPa环流形势

(黑点处:大暴雨区, 细实线:等高线 (dagpm), 虚线:等温线 (℃), 粗实线:低槽线、切变线)

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图 4 1998年6月29日20:00 1000 hPa θ_se (单位:℃) 流场图 (箭矢) (大暴雨区:黑点处)

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图 5 1998年6月29日20:00物理量与暴雨区的叠套图

(阴影区:暴雨区, 实线:1000~925 hPa Q矢量锋生函数≥8×10^-16 K²·m^-2·s^-1, 点线:1000~700 hPa T-T_d≤ 4℃, 叉线:θ_se850≥72℃, 齿线:K指数≥38℃, 点划线:潜在不稳定θ_se850-θ_se500^*≥8℃, 虚线:1000~925 hPa水汽通量散度≤-2×10^-8 g·cm^-2·hPa^-1·s^-1)

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图 6 1998年6月29日20:00通过大暴雨区 (北京) 的θ_se (细实线) 及流场经向垂直剖面

(50°N, 116°E~30°N, 116°E, 格距100 km, 粗实线:切变线)

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图 7 1998年6月29日20:00通过大暴雨区 (北京) 的经向流场、Q矢量锋生 (10^-16 K²·m^-2·s^-1) 垂直剖面

(50°N, 116°E~30°N, 116°E, 格距100 km)

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图 8 1998年6月29日20:00经过大暴雨区 (北京) 的纬向流场、涡度平流 (10^-10s^-1) 垂直剖面

(40°N, 100°E~40°N, 130°E, 格距100 km)

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图 9 1998年6月29日20:00经过大暴雨区 (北京) 的纬向流场、散度 (10^-5s^-1) 垂直剖面

(40°N, 100°E~40°N, 130°E, 格距100 km)

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References

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