renhe zhang yunqi ni state key laboratory of severe weather chinese academy of meteorological...

Renhe Zhang Yunqi Ni

State Key Laboratory of Severe WeatherChinese Academy of Meteorological Sciences

SSouth outh CChina hina HeHeavy avy RRainfall ainfall EExperimentxperiment

————SCHeREX (2007-2009) SCHeREX (2007-2009)

1. Motivation

复杂的梅雨锋与锋上的中尺度对流云塔

TRMM retrieved structure of Meiyu Front (21:40; 20 July, 1998)

（ left： 3 dimensional right： horizontal）

新 15Km 业务 30Km Germany forecaster

ETS评分

Japan

SCHeREX aims at:

1) understanding meso-scale convective systems and their relations to the large-scale circulation;

2) improving capability of heavy rainfall prediction.

2. Objectives, experimental regions and periods

1) Objectives

1. Establish meso-scale observation networks;

2. Obtain meteorological data describing 4 dimensional structure of meso-scale systems;

3. Develop meso-scale reanalysis systems and forming a high time-space resolution reanalysis meteorological fields;

4. Improve heavy rainfall prediction by using this database.

The experimental regions include the areas in southern China and middle and lower reaches of Yangtze River valley. It is related to more than ten provinces in South China.C

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3) Experimental period

From May to July in 2008 and maybe extended to 2009.

3. Design of the meso-scale observation network

1) Design of meso scale observation network

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Huihe Obs.region

Middle reaches of YZ River obs. region

Lower reaches of YZ River Obs. Region

Southern China Region

Doppler radars 9

Surface stations 169

Sounding stations 10

Automatic Weather Stations 600

Meteo. Satellite FY-2C, 2D and others

GPS data & wind profiles

2) Design of meso scale-β observation network in Southern China

109 110 111 112 113 114 115 116 11720

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Distribution of annual mean heavy rainfall days in Guandong

中中— ß 尺度观测区尺度观测区

香港

连平

汕头

斗门

阳江

清远怀集

广宁

四会

恩平

上岛川

英德

龙门

广州

中山

东莞 惠阳惠东

汕尾

陆丰

郁南

五华

韶关

电白

meso-β scale observation network in Southern China

Surface Station

Operational radio sounding

GPS sounding

Wind profiler

Operational Radar

Movable Radar

Guandong Province meso-βscale observation region

Equipments Number

Doppler radar operational 6

Movable 2

Sounding

station

Operational 6

GPS sounding/boundary

layer

15

Wind profile 3

Surface stations operational 30

AWS 300

GPS/moisture

(3) Movable Observation Systems

Movable C-band Doppler Radar

Wind Profiler

Drop sounding

Cloud image every 15 minutes from FY-2C and FY-2D

ACB

0600 UTC 22 June 2002

Wind retrieved from clouds at 200-300hpa

MCCMCC的垂直结构的垂直结构（（ATOVSATOVS同化分析场）同化分析场）

•暖湿空气倾斜向北抬升

•MCC覆盖区域对流层中上层有暖心，对流层顶、平流层底为冷心

•MCC覆盖区域低层高度下降，高层高度增加，150hPa附近有高中心

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Analysis using remote sensing retrieval data for Analysis using remote sensing retrieval data for three dimensional temperature & moisture structure three dimensional temperature & moisture structure of meso-scale systemsof meso-scale systems

配对雷达的距离适中： 60－ 80KM 立体扫描时间短，层数要尽量多

Retrieval area of dual-Doppler radars

两个雷达径向速度的夹角在（ 30－ 1500 ）之间

广州 龙门

112 113 114 115

22

23

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业务雷达广州 23º 00′113º 21′

深圳 22º 33′114º 06′

香港 22º 15′114º 08′

澳门 22º 10′113º 33′

车载雷达龙门 23º 44′114º 14′

惠阳 23º 05′114º 25′

广州

香港澳门

龙门

深圳

惠阳

Dual-Doppler Radar NetworkDual-Doppler Radar Network in Southern China meso—in Southern China meso—β β

Obs. RegionObs. Region

5. Database and data share of CHeREX

Database

Documents Raw Data Products

6. Organizing of CHeREX

CHeREX Leaders group

CHeREX Headquarters

CHeREX Office

Working groupOf meso –scale Obs.

Working groupOf Data processing

Working group of Analysis of

satellite remote sensing

Working groupOf database

Working group of Quick look & meso-scale

analysis

Working group of

reanalysis &

prediction

Headquarters OrganizationFlow Chart

Financial Support

• National Key Project for Developing Basic Sciences (973) “Theories and Methods for Monitoring and predicting Heavy Rainfall in South China” (2004-2009; PI: Renhe Zhang)

• State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences

7. Summary

1. Implement SCHeREX in May-July 2008/2009.2. Characteristics of CHeREX are (1) establishing dual-Doppler observation network with four operational Doppler radars and two movable Doppler radars; (2) implementing dropsonde detecting from plane; (3) Using dual polarized Doppler radar to detect the parameters inside of cloud; (4) Increasing sounding density by using GPS/boundary layer sounding.3. Use satellite data to increase meso-scale observation including FY-2C, FY-2D, COSMIC, et al.;4. Develop meso-scale reanalysis system.

Thank you!