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云南省副高外围类短时强降水的雷达回波特征
何钰
(云南省气象台)
The Radar Echo Characteristics of Short-Time Strong Rainfall in the Periphery of Subtropical High on Yunnan
heyu
(Yunnan Meteorological Observatory)
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投稿时间:2019-11-13    修订日期:2020-11-28
中文摘要: 本文统计分析了2014-2016年5-10月国家站共出现219站次的有效短时强降水及云南省7部多普勒天气雷达资料,将云南省副高外围的短时强降水进一步细分为两高辐合类、单纯副高外围类及副高西侧配合西风槽类。初步得出以下结论:8月为云南省副高外围类短时强降水的高发期且降水时段集中在午后及前半夜;两高辐合类降水沿着辐合区呈显著的带状分布特征,降水强度强、落区相对集中。单纯副高外围类降水主要位于滇南地区,存在三个强降水中心。副高西侧配合西风槽类降水主要位于云南省的边缘地区,落区较为分散;三类降水回波主体平均强度均在35-45 dBz之间,平均持续9个体扫;近1/4的回波出现回波倾斜及强回波梯度的特征,且降水明显强于未出现的回波,一定程度上可以作为判断降水强度的参考依据;三类降水的最强ET及VIL出现的时间均同最强回波出现的时间基本一致或略有滞后;两高辐合类的VWP中有近一半的个例低层存在西南风或西风气流,对应明显的暖平流输送特征。随着降水发展与副高外围晴空区相对应的无资料区逐渐消失则是单纯副高外围类降水的VWP表现最明显的特征。副高西侧配合西风槽类降水开始前后均存在高空西北气流入侵及中层风切变的特征,与低槽后部带来的冷平流及冷暖气流交汇相对应。
Abstract:Using 219 effective short time strong rainfall at national station and 7 Doppler weather radar data in Yunnan province from May to October in 2014 to 2016. The short time strong rainfall in the periphery of the subtropical high in Yunnan province is further subdivided into two high convergence category, simple periphery of the subtropical high category and the west side of subtropical high with westerly trough category. Preliminary conclusions are as follows: August is the high incidence period of short-time strong rainfall in the periphery of the subtropical high in Yunnan province, and the precipitation period is concentrated in the afternoon and the first half of the night. The two high convergence precipitation distributes along the convergence area, with strong precipitation and relatively concentrated falling area. The simple periphery of the subtropical high precipitation mainly located in southern Yunnan, manifested as three large value regions. The west side of subtropical high with westerly trough precipitation is mainly located at the edge of Yunnan province, while the area is scattered. The average intensity of the three types of precipitation echoes is between 35 and 45 dBz, average duration of 9 volume scan. Nearly a quarter of the echoes appears inclination and strong echo gradient, and the precipitation is obviously stronger than the echo which does not appear. In a way that can be uesd as a basis for judging the intensity of precipitation. The occurrence time of the strongest ET and VIL of the three types of precipitation is basically the same time as that of the strongest echo, or slightly lagged behind. Nearly half of the two high convergence VWPs have southwesterly or westerly airflow in the lower layer, which corresponds to the obvious characteristics of warm advection. With the development of precipitation, The disappearance of no-data area corresponding to the clear sky area around the subtropical high is the most obvious feature of VWP of precipitation in the simple periphery of the subtropical high.. For the west side of subtropical high with westerly trough category, whether precipitation begins or not, invasion of upper northwest airflow and middle-level wind shear are both exist. Corresponds to the cold advection brought by the rear of the low trough and the intersection of warm and cold air currents.
文章编号:201911130399     中图分类号:    文献标志码:
基金项目:国家局预报员专项(CMAYBY2017—069),国家局预报员专项(CMAYBY2020-121)
引用文本:
何钰,0.The Radar Echo Characteristics of Short-Time Strong Rainfall in the Periphery of Subtropical High on Yunnan[J].Meteor Mon,():-.
heyu,0.The Radar Echo Characteristics of Short-Time Strong Rainfall in the Periphery of Subtropical High on Yunnan[J].Meteor Mon,():-.