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气象:2016,42(9):1090-1095
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风廓线下落速度在浙江冬季降水相态识别中的应用
(1.浙江省气象台,杭州 310017;2.浙江省气象服务中心,杭州310017)
Application of Wind Profiler Velocity Data in Identifying Winter Precipitation Types in Zhejiang Province
(1.Zhejiang Meteorological Observatory, Hangzhou 310017;2.Zhejiang Meteorological Service Centre, Hangzhou 310017)
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投稿时间:2015-07-08    修订日期:2016-02-15
中文摘要: 利用浙江7部风廓线雷达探测资料,进行了不同相态降水粒子下落末速的数据分析,统计得到不同降水相态的下落速度阈值,液态降水粒子的下降速度为1.8~6.0 m·s-1,固体降水在0.1~1.8 m·s-1。同时对浙江省2011—2014年4年冬季8次雨雪转化过程中的探空资料和地面降水观测资料进行分析,得到最适合浙江省冬季降水相态识别判据是2 m温度、1000 hPa温度、0℃层高度和850和1000 hPa高度差。通过计算各指标的空报率、漏报率和TS评分,得到了最佳阈值,预报雨和雪最佳阈值的TS评分都可达到0.8以上。对雨夹雪的判断,需结合中层暖层指标,可以使判别准确率明显提高。
Abstract:Applications of vertical velocity in forecast are studied by analyzing the vertical velocity data from Zhejiang wind profiler radars (WPR). Based on falling speed data of precipitation particles in different precipitation phases, the vertical speed characteristics of different precipitation phases are established. In terms of the analysis of radiosonde and surface observation data of 4 winters during 2011-2014 in Zhejiang Province, 2 m temperature, 1000 hPa temperature, height difference between 850 hPa and 1000 hPa and the height of 0℃ layer are suggested as the best identification indexes for identifying winter precipitation types. And the best identification criterion is given at which TS score can be greater than 0.8. The TS scores of these indexes are poor to use, but when combined with index of middle level warm layer, they can be improved obviously.
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基金项目:浙江省气象局重大科技计划项目(2014ZD10 2)、华东区域合作基金项目(QYHZ201403)和浙江公益技术研究社会发展项目(2013C33G1610020)共同资助
引用文本:
孔照林,赵放,彭霞云,吴杨,2016.风廓线下落速度在浙江冬季降水相态识别中的应用[J].气象,42(9):1090-1095.
KONG Zhaolin,ZHAO Fang,PENG Xiayun,WU Yang,2016.Application of Wind Profiler Velocity Data in Identifying Winter Precipitation Types in Zhejiang Province[J].Meteor Mon,42(9):1090-1095.