ANALYSIS OF RELATION OF SOUTH ASIA HIGH AND RAINSTORM CAUSED BY NORTHWESTERLY UPPER-LEVEL JET

Ding Zhiying; Zhang Xingqiang; Shou Shaowen

Vol.13, NO.6, 2002

Article Contents

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Ding Zhiying, Zhang Xingqiang, Shou Shaowen. Analysis of relation of South Asia High and rainstorm caused by northwesterly upper-level jet. J Appl Meteor Sci, 2002, 13(6): 671-679.

Citation:

Ding Zhiying, Zhang Xingqiang, Shou Shaowen. Analysis of relation of South Asia High and rainstorm caused by northwesterly upper-level jet. J Appl Meteor Sci, 2002, 13(6): 671-679.

Ding Zhiying, Zhang Xingqiang, Shou Shaowen. Analysis of relation of South Asia High and rainstorm caused by northwesterly upper-level jet. J Appl Meteor Sci, 2002, 13(6): 671-679.

Citation:

Ding Zhiying, Zhang Xingqiang, Shou Shaowen. Analysis of relation of South Asia High and rainstorm caused by northwesterly upper-level jet. J Appl Meteor Sci, 2002, 13(6): 671-679.

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ANALYSIS OF RELATION OF SOUTH ASIA HIGH AND RAINSTORM CAUSED BY NORTHWESTERLY UPPER-LEVEL JET

Nanjing Institute of Meteorology, Nanjing 210044

Received Date: 2001-02-15
Rev Recd Date: 2002-01-22
Publish Date: 2002-12-31

Abstract

Abstract

Using MM4 model, the process of rainstorm is molded in the period from 08:00 BLT July 21 to 08:00 BLT July 22, 1998. It is found that the convergence and divergence field of the South Asia High and the northwesterly upper-level jet form a couple of mesoscale direct circulation and counter-circulation. The circulation pattern keeps the rainfall maintaining and strengthening. The sinking of the high potential vorticity is related to the lower vortex and the rainfall increasing. The conditional convective instability in the later period is more obvious for the effect of rainstorm than conditional symmetric instability.
- Rainstorm;
- Northwesterly upper-level Jet;
- South Asia high;
- Meso-scale circulation;
- Symmetric instability

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References(7)

Figures and Tables

图 1 21 日08:00-22 日08 :00 降水量(单位:mm)与200 hPa 全风速(虚线单位:m/s)

(a)实况(b)预报

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图 2 21 日14 :00~20:00,22 日02 :00-08 :00 的6 h 降水量实况(右图)与控制试验结果(左图)

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图 3 控制试验积分0 h(a),12 h(b),24 h(c)和去除潜热加热试验积分24 h(d)的沿114°E 的v(单位:m/s)剖面

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图 4 控制试验积分0、6、12、24 h 114°E 中尺度环流剖面

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图 5 21 日08:00 和22 日08:00 沿114°E 等M_g 面(虚线)、等θ_e 面(实线)配置图

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图 6 21 日08:00、20:00,22 日08:00 的ζEPV 1(a,b,c)

(单位:10^-6m²·K·s^-1·kg^-1)及其相对应的环流剖面

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References

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