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西宁强降水的多普勒天气雷达径向速度图特征研究
谢启玉1, 魏国财2, 张令振1, 赵娟1
(1.青海省西宁市气象台;2.青海省气象台)
Research on the Characteristics of the Doppler-Radar Velocity Images for Heavy Rainfall Events in Xining
XIE Qi-yu1, WEI Guo-cai2, ZHANG Ling-zhen1, ZHAO Juan1
(1.Xining Meteorological Service of Qinghai Province;2.Qinghai Province Meteorological Service)
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投稿时间:2018-10-24    修订日期:2019-04-06
中文摘要: 分析了2010—2016年西宁强降水的多普勒天气雷达径向速度图特征及预警指标,结果表明:西宁强降水的径向速度图上往往会出现逆风区,且直接受影响的混合性强降水Ⅰ类逆风区略多,对流性强降水多为Ⅱ类,总体上逆风区以东北向移动为最多。逆风区较强降水出现时间有一定的提前量,且强降水落区在逆风区及其移动路径附近,逆风区既是强降水预警的时效性判据,也是识别强降水落区及路径的有用判据。逆风区切变流场的辐合(散),将增强(减弱)强降水的发展,且辐合(散)的出现提前于强降水的开始(结束)。强降水前1h的垂直风切变特征为混合性强降水低层最大、中层最小,对流性强降水各层均明显大;低—中—高层冷、暖平流的配置混合性强降水主要表现为深厚暖平流,对流性强降水则平流不明显或低、中层有暖平流。对流性强降水最大回波高度和零速度层均较混合性强降水高,但其总体差别较小。综合应用径向速度确定的强降水临近预警指标,准确率达到78.6%。
Abstract:The characteristics of heavy rainfall events on the Doppler weather radar velocity images and their early warning indicators in Xining from 2010 to 2016 are analyzed, the results show that the Adverse Wind Regions(AWR) on radial velocity images often occur in the case of heavy rainfall events in Xining, and type-I-AWR is slightly more for the mixed heavy precipitation and type-Ⅱ-AWR is mostly for the convective heavy precipitation during directly affected heavy rainfall events, and AWR mostly northeastward move in general. The occurring time of the AWR has a certain amount of advance for the beginning of heavy rainfall events, and heavy precipitation falls near the AWR and its moving path, that is, the AWR is not only a time-based criterion for issuing an early warning for heavy precipitation but also a useful criterion for identifying falling areas of heavy precipitation. When the shear flow field in the AWR is convergent (divergent), it will promote (weaken) the development of heavy precipitation, and the time of the convergence (divergence) is ahead of schedule for the beginning (end) of heavy precipitation. Before 1 hour of heavy precipitation beginning, the vertical wind shear is the largest on the low layer and is the smallest on the middle layer for the mixed heavy precipitation, while it is obviously large on every layer for the convective heavy precipitation. The wind direction changes mainly show deep and warm advection for the mixed heavy precipitation, while they are not obvious or are warm advection on the low and the middle layers for the convective heavy precipitation. The maximum echo heights and zero velocity layers are higher for the convective heavy precipitation than for the mixed heavy precipitation, but there are smaller differences on the whole for the convective heavy precipitation. The indicators for early warning of heavy precipitation by comprehensive application of the radial velocity are defined, and the accuracy rate reaches 78.6%.
文章编号:201810240470     中图分类号:    文献标志码:
基金项目:青海省西宁市气象局重点项目(201611)
引用文本:
谢启玉,魏国财,张令振,赵娟,0.[en_title][J].Meteor Mon,():-.
XIE Qi-yu,WEI Guo-cai,ZHANG Ling-zhen,ZHAO Juan,0.Research on the Characteristics of the Doppler-Radar Velocity Images for Heavy Rainfall Events in Xining[J].Meteor Mon,():-.