STUDY OF MICROWAVE CHARACTERISTICS OF RAINFALL OVER SOUTH CHINA AND YANGTZE RIVER BASIN USING TRMMDATA

Wu Qingmei; Cheng Minghu; Miao Chunsheng

Vol.14, NO.2, 2003

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2003 > 14(2): 206-214

Wu Qingmei, Cheng Minghu, Miao Chunsheng. Study of microwave characteristics of rainfall over South China and Yangtze River Basin using TRMM data. J Appl Meteor Sci, 2003, 14(2): 206-214.

Citation:

Wu Qingmei, Cheng Minghu, Miao Chunsheng. Study of microwave characteristics of rainfall over South China and Yangtze River Basin using TRMM data. J Appl Meteor Sci, 2003, 14(2): 206-214.

Wu Qingmei, Cheng Minghu, Miao Chunsheng. Study of microwave characteristics of rainfall over South China and Yangtze River Basin using TRMM data. J Appl Meteor Sci, 2003, 14(2): 206-214.

Citation:

Wu Qingmei, Cheng Minghu, Miao Chunsheng. Study of microwave characteristics of rainfall over South China and Yangtze River Basin using TRMM data. J Appl Meteor Sci, 2003, 14(2): 206-214.

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STUDY OF MICROWAVE CHARACTERISTICS OF RAINFALL OVER SOUTH CHINA AND YANGTZE RIVER BASIN USING TRMMDATA

1.
Beijing Meteorological Bureau, Beijing 100089
2.
Chinese Academy of Meteorology Sciences, Beijing 100081
3.
Nanjing I nstitute of Meteorology, Nanjing 210044

Received Date: 2002-01-04
Rev Recd Date: 2002-04-29
Publish Date: 2003-04-30

Abstract

Abstract

TRMM (Tropical Rainfall Measurement Mission) was launched in December 1997, which carried a space radar for the first time and the related data have been made available to the public users since June 1998.The microwave characteristics of rainfall over South China and the Yang tze river basin are investigated by using TMI (TRMM Microwave Imager) data and TRMM-derived precipitation products through Is (Scattering Index) algorithm.The expression of the I_sis regressed by the TMI data on sunny days.For 14 rainfall cases, the relationship between the I_sprecipitation threshold obtained through the "area equal" method and the precipitation area and the coldest top temperature of 85.5 GHz vertical channel is investigated.At the same time, the correlation between I_sand surface instantaneous rain intensity is studied.The result shows that the I_sthreshold has the increasing tendency when the precipitation area increases or the top temperature decreases, and I_s≥60 K is a good index of rainstorm.The instantaneous rain intensity is retrieved, and it is found that I_scan be used to retrieve rain intensity better because of the improvement of data resolution and the temporal and spatial consistency of the data.
- TMI;
- Scattering index;
- Threshold;
- Instantaneous rain intensity

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References(14)

Figures and Tables

图 1 2000年6月24日19:53(北京时, 下同) 降水/非降水散点图

DownLoad: Full-Size Img PowerPoint

图 2 I_s降水阈值与降水面积 (a) 及最低云顶温度 (b) 散点图

(面积单位:13.9 km ×9.1 km)

DownLoad: Full-Size Img PowerPoint

图 3 瞬时雨强和I_s折线图 (实线代表雨强, 虚线代表散射指数)

(a) 个例1, (b) 个例2, (c) 个例3, (d) 个例4, (e) 个例8, (f) 个例10

DownLoad: Full-Size Img PowerPoint

图 4 TMI85.5GHz垂直极化通道亮温图像

(a)2000年6月2日07:38, (b)2000年6月2日11 :00

DownLoad: Full-Size Img PowerPoint

图 5 地面瞬时雨强-I_s散点图

(a) 处理前, (b) 处理后

DownLoad: Full-Size Img PowerPoint

表 1 TMI各通道参数

表 2 面积相当法得到的阈值及其准确性检验

表 3 14个个例的降水面积、最低云顶亮温和I_s降水阈值

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