A CASE STUDY OF PERSISTENT HEAVY RAINFALL OVER HUNAN PROVINCE IN JULY 1996

Zhang Xiaoling; Tao Shiyan; Zhang Shunli; Zhang Qingyun

Vol.15, NO.1, 2004

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Zhang Xiaoling, Tao Shiyan, Zhang Shunli, et al. A case study of persistent heavy rainfall over Hunan Province in July 1996. J Appl Meteor Sci, 2004, 15(1): 21-31.

Citation:

Zhang Xiaoling, Tao Shiyan, Zhang Shunli, et al. A case study of persistent heavy rainfall over Hunan Province in July 1996. J Appl Meteor Sci, 2004, 15(1): 21-31.

Zhang Xiaoling, Tao Shiyan, Zhang Shunli, et al. A case study of persistent heavy rainfall over Hunan Province in July 1996. J Appl Meteor Sci, 2004, 15(1): 21-31.

Citation:

Zhang Xiaoling, Tao Shiyan, Zhang Shunli, et al. A case study of persistent heavy rainfall over Hunan Province in July 1996. J Appl Meteor Sci, 2004, 15(1): 21-31.

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A CASE STUDY OF PERSISTENT HEAVY RAINFALL OVER HUNAN PROVINCE IN JULY 1996

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

Received Date: 2002-12-25
Rev Recd Date: 2003-03-10
Publish Date: 2004-02-29

Abstract

Abstract

The heavy rainfall over Hunan Province in July 1996 was studied. The main conclusions are made as follows: (1) Persistent rainstorms causing flash-flood in Hunan Province lied in the front of 500 hPa short wave troughs. (2) MCS generated and detained in the same area, which is the direct reason causing lasting heavy rainfall. (3) By warm advection in the lower troposphere and other large-scale forcing, the upper troughs maintained over the middle of the Yangtze River Basin, which brought continuous lifting movement in the rainstorm area. At the same time, continuous moisture convergence and potential instable energy transport in the lower layers provided enough water and energy for lasting heavy precipitation over the rainstorm area。
- Meiyu front;
- Upper trough;
- MCS;
- Large-scale forcing

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References(10)

Figures and Tables

图 1 1996年7月14～18日500 hPa 平均位势高度分布(单位:gpm)

(阴影表示TBB ≤-32 ℃；粗实线表示槽线)

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图 2 1996年7月13～18日逐日08:00 θ=310 K 等熵面天气形势分布

(实线为等压线(单位:hPa)；风标表示风场(单位:m·s^-1)；粗虚线为比湿(单位:g·kg-1)；阴影区为比湿≥10 g·kg^-1)

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图 3 1996年7月14日20:00～16日23:00每3 h 一次的TBB 分布

(阴影区由浅到深分别代表TBB 值为-32 、-40 、-50 、-60 、-70 ℃)

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图 4 1996年7月12～17日逐日的整层(地面至300 hPa)水汽通量

(箭矢所示，单位:10^-3kg·m^-1s^-1)和水汽通量散度(单位:10^-3kg·m^-2·s^-1)分布(a)12日,(b)13日,(c)14日,(d)15日,(e)16日,(f)17日

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图 5 1996年7月12～17日Q 矢量(单位:10^-12 m·hPa^-1·s^-3)及其散度 ·Q(单位:10^-17 hPa^-1·s^-3)的分布

(a)12日,(b)13日,(c)14日,(d)15日,(e)16日,(f)17日

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图 6 1996年7月12～19日暴雨区各物理量的时间-高度剖面

(a)θ_e(单位:K)，(b) q(单位:g·kg-1)，(c) ·q V(单位:10^-7s^-1),(d)ζ(单位:10^-5s^-1)，(e) ·V(单位:10^-5s^-1)，(f) ω(单位:10^-1 Pa·s^-1)

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表 1 1996年7月13～16日怀化探空记录计算结果

References

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