ANALYSIS OF LOW FREQUENCY OCSILLATIONS OF THREE RAINSTORMS DURING THE PERIOD OF MEIYU IN 2004 OF ANHUI

Chen Xiaohong; Zhang Jiao

Vol.16, NO.6, 2005

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2005 > 16(6): 753-762

Chen Xiaohong, Zhang Jiao. Analysis of low frequency ocsillations of three rainstorms during the period of Meiyu in 2004 of Anhui. J Appl Meteor Sci, 2005, 16(6): 753-762.

Citation:

Chen Xiaohong, Zhang Jiao. Analysis of low frequency ocsillations of three rainstorms during the period of Meiyu in 2004 of Anhui. J Appl Meteor Sci, 2005, 16(6): 753-762.

Chen Xiaohong, Zhang Jiao. Analysis of low frequency ocsillations of three rainstorms during the period of Meiyu in 2004 of Anhui. J Appl Meteor Sci, 2005, 16(6): 753-762.

Citation:

Chen Xiaohong, Zhang Jiao. Analysis of low frequency ocsillations of three rainstorms during the period of Meiyu in 2004 of Anhui. J Appl Meteor Sci, 2005, 16(6): 753-762.

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ANALYSIS OF LOW FREQUENCY OCSILLATIONS OF THREE RAINSTORMS DURING THE PERIOD OF MEIYU IN 2004 OF ANHUI

Anhui Provincial Meteorological Observatory, Hefei 230031

Received Date: 2004-12-29
Rev Recd Date: 2005-04-11
Publish Date: 2005-12-31

Abstract

Abstract

In terms of wavelet, vortex and moisture flux divergence analyses, study is undertaken of 2004 rainstorms from June to August in Anhui. Results show that the elements exhibit significant 2~6 d, 7~15 d and 18~30 d oscillations. The variations of 2~6 d and 7~15 d oscillations of the these elements are almost consistent with the anomaly of precipitation from mid-June to later-June. The vortex of the 7~15 d oscillation moves towards Anhui along the mid-latitude from west to east, and the moisture flux divergence of the 7~15 d oscillation moves towards Anhui from low-latitudes. The cyclone and anticyclone wave trains of the 7~15 d oscillation moves towards northwest over the equatorial west Pacific Ocean and the high frequency change of the streamline field at low levels provide favorable conditions for Anhui rainstorms in June 2004。
- Strom rainfall;
- Low frequency oscillations;
- Filtering

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References(10)

Figures and Tables

图 1 2004 年6-8 月安徽省降水小波分析

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图 2 2004 年6 ～ 8 月安徽省降水、涡度和水汽通量分析(a)18～ 30 d 低频分量,(b)7～ 15 d 低频分量,(c)2～ 6 d 高频分量(柱状图为实际降水量

柱状图为实际降水量距平，单位:mm ；□为降水低频分量，单位:mm ；○为涡度低频分量，单位:10^-5s^-1 ；★为水汽通量散度低频分量，单位:1000 g·cm^-1·hPa^-1·s^-1

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图 3 2004 年6 月850 hPa 7-15 d 低频系统传播图像(a)低频涡旋系统

阴影区为水汽辐合区，单位:1000 g.cm^-1·hPa^-1·s^-1

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图 4 2004 年6 月18-30 d 低频风场(单位:m/s)(a)6 月8 日，(b)6 月20 日4.2

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图 5 2004 年6 月7-15 d 低频风场(单位:m/s)

(a)6 月9 日，(b)6 月14 日，(c)6 月18 日，(d)6 月24 日

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图 6 2004 年6 月2-6 d 低频风场(单位:m/s ，阴影区为暴雨落区)

(a)6 月14 日，(b)6 月18 日，(c)6 月23 日，(d)6 月24 日

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