上海712飑线系统的单多普勒雷达的资料反演分析.pptVIP

Analysis for the Structure of Meso-scale Convective Systems on Squall Line Process on July 12 2004 at Shanghai Liu shuyuan Sun Jian ( CAMS, Beijing, China )? Yang yinming (Shanhai Meteorological Center ) Objective Many good work about SL and bow echo have been done by Meteorological scientist. The sketch map has been put forward by the COMET program. Most of the cases which have been analyzed were occurred outside of China. The meso-scale structure hadn’t been analyzed in china before the Doppler radar network was established. The structure of the squall line and bow echo occurred at different area maybe not same because of the different climate and terrain. Outline Synoptic view of the weather at July 12th 2004 Analysis based on the infrared image Retrieved , verified and analysis of the horizontal wind field and reflectivity Conclusion instantaneous wind Analysis based on the infrared image The time interval of the infrared image is about half an hour Retrieved , tested and analysis of the horizontal wind field The data Shanghai Doppler radar ：altitude 0.58 km； A volume scan per 6 ,9 elevation，azimuth resolution 10，radial resolution 0.25 km,range 233 km Because of the data at high elevation is bad, the low elevation data be used only(100*sin0.48 =83.77m ). Tangent Verifying Analysis Analysis based on the reflectivity observed by Doppler radar Three strong reflectivity region Two weak narrow echo band BOW The weak echo line at the front of the squall line disappeared The moving speed about 60km/hour during 1731 to 1800 The moving speed about 45km/hour during 1800 to 1829 Squall line began to weaken Analysis on horizontal wind field Three cyclones Southeast----northwest and southwest and northeast---southwest and The wind convergence about line1 line2 * * Synoptic overview of the weather at JULY 12th 2004 Precipitation 28.4mm ; temperature went down 100; the biggest instanta