摘要: |
本文主要利用黔东南榕江双偏振多普勒天气雷达、常规观测和加密自动站观测等资料,对黔东南2020年5月31日及6月8日两次暖区暴雨天气过程的雷达回波特征进行分析,结果表明:(1)月亮山区暖区暴雨的雷达回波主要以积状云回波为主,地形对回波具有明显强迫抬升作用;(2)回波演变主要分为三个阶段,对流回波的“合并增强”,单体后向传播形成长时间的“列车效应”,造成了月亮山区的暴雨过程;(3)径向速度场往往配合逆风区及γ中尺度的气旋式辐合;回波顶高、垂直积分液态含水量伴随跃增现象;(4)暖区暴雨由低质心+高质心回波共同影响造成,发展旺盛的单体生消较快,对流性特征显著;(5)随着质心高度、最大垂直液态水含量及最大回波强度的升高,雨强也会随之增强,但是三者与雨强变化之间存在一定的滞后关系;(6)暴雨以上降水以大雨滴为主,降水强度强,雨滴浓度大;(7)雷达估测的1h累积降水量、3h累积水量及风暴总降水量产品的演变与对应的自动站观测到的实际雨量变化趋势较为一致,但与实况均存在一定的偏差,且随着雨强的增大,误差随之增大;3h累积水量及风暴总降水量两个产品能较好地反映出强降水落区。 |
关键词: 月亮山区;暖区暴雨;双偏振雷达回波特征;短时强降雨 |
DOI: |
投稿时间:2022-02-23修订日期:2022-06-15 |
基金项目:基于榕江双偏振多普勒天气雷达资料的黔东南月亮山区致灾暴雨研究,月亮山区暖区暴雨天气过程双偏振雷达回波特征分析 |
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Analysis of dual-polarization radar echo characteristics of two warm-area rainstorms in the Moon Mountain area |
maoqian,sunfeifei,yangchanghong,shiqianwen,baihui |
(Meterological Bureau of Southeast Guizhou;Rongjiang Meteorological Bureau of Guizhou Province;Zhijin Meteorological Bureau of Guizhou Province) |
Abstract: |
In this paper, the radar echo characteristics of two warm-area torrential rain events on May 31 and June 8, 2020 in southeastern Guizhou are analyzed by using the data of Rongjiang dual-polarization Doppler weather radar, conventional observation and encrypted automatic station observation in southeastern Guizhou. The results show that: (1) The radar echo of the rainstorm in the warm area of the moon mountain is mainly the echo of cumulus clouds, and the terrain has an obvious forcible uplifting effect on the echo; (2) The evolution of the echo is mainly divided into three stages , The "merger enhancement" of convective echoes, and the long-term "train effect" formed by the backward propagation of the single body, which caused the rainstorm process in the moon mountain area; (3) The radial velocity field often cooperates with the headwind area and the γ-medium-scale cyclone; the echo top height and the vertical integral liquid water content are accompanied by a jump phenomenon; (4) The warm area rainstorm is caused by the combined effect of low-centroid + high-centroid echo, and the vigorously developing monomers produce and dissipate faster, and have significant convective characteristics; (5) As the height of the center of mass, the maximum vertical liquid water content and the maximum echo intensity increase, the rain intensity will also increase, but there is a certain lag relationship between the three and the change of rain intensity; (6) The precipitation above torrential rain is dominated by heavy raindrops, the rainfall intensity is strong, and the concentration of raindrops is large; (7) The evolution of 1h cumulative rainfall, 3h cumulative rainfall and total rainstorm precipitation products estimated by radar are consistent with the actual rainfall observed by the corresponding automatic station, but there is a certain deviation from the actual situation, and with the increase of rainfall intensity , the error will also increase; the two products of 3h cumulative rainfall and total rainstorm rainfall can better reflect the heavy rainfall area. |
Key words: the moon mountain area; warm area rainstorm; dual-polarization radar echo characteristics; short-term heavy rainfall |