重庆铜梁雷暴大风雷达回波特征统计分析

Statistical Analysis of Radar Echo Characteristic of Thunderstorm Gale in Chongqing Tongliang

摘要: 本文利用铜梁地区2012~2021年的雷达资料配合大风的实况观测资料，根据雷暴大风的定义，筛选出18例雷暴大风天气个例，并详细分析每个个例中的雷达回波特征，得到以下结论：(1) 铜梁的雷暴大风过程基本发生在汛期(4~9月)，8月是汛期发生雷暴大风频率最高的，9月份几乎不发生；(2) CR ≥ 50 dbz的最大组合反射率因子强度是雷暴大风(8级)产生的阈值，CR ≥ 60 dbz是产生9级以上雷暴大风的阈值；(3) ET值 ≥ 12 km可以视为雷暴大风发生的理论阈值，VIL值 ≥ 15 kg/m2是铜梁雷暴大风过程可能发生的阈值。

Abstract: This paper, by using the doppler weather radar along with the live observation of wind ranging from 2012 to 2021 in Tongliang, according to the definition of thunderstorm gale, selected eighteen cases of thunderstorm gale and thoroughly analyzed the characteristics of radar echo characteristics in each case. The conclusions are as follows: (1) The thunderstorm gale occurs mainly in flood season (from April to September), with the highest frequency in August and the rarely occurrence in September; (2) While the maximum composite reflectance factor intensity of CR ≥ 50 dbz constitutes the threshold of thunderstorm gale (Grade 8 on the Beaufort scale), CR ≥ 60 dbz constitutes the threshold of thunderstorm gale above Grade 9 on the Beaufort scale; (3) ET value ≥ 12 km can be regarded as the theoretical threshold of thunderstorm gale and VIL value ≥ 15 kg/m2 is the pos-sible threshold of the thunderstorm gale in Tongliang district.