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气象:2022,48(7):856-867
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闽西南地区一次春季降雹过程的双偏振参量及降水粒子谱特征
何清芳,林文,张深寿,肖秀珠,张红梅
(福建省龙岩市气象局,龙岩 364000;福建省气象科学研究所,福州 350001; 福建省灾害天气重点实验室,福州 350001)
Dual Polarization Parameters and Precipitation Particle Spectrum Characteristics of a Spring Hail Event in Southwestern Fujian
HE Qingfang,LIN Wen,ZHANG Shenshou,XIAO Xiuzhu,ZHANG Hongmei
(Longyan Meteorological Office of Fujian Province, Longyan 364000; Fujian Institute of Meteorological Sciences, Fuzhou 350001; Fujian Key Laboratory of Severe Weather, Fuzhou 350001)
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投稿时间:2021-01-29    修订日期:2022-04-08
中文摘要: 基于福建龙岩S波段双偏振雷达和地面降水现象仪资料对2020年3月27日龙岩永定的冰雹云以及同时发生在龙岩漳平的短时强降水云体进行观测对比分析。结果表明:降雹单体在降雹前出现回波高度跃增,存在有界弱回波区,在云体移动方向前部出现了强度为2~4 dB的ZDR弧,内部KDP柱发展较高,最高至7~8 km,强降水云体也出现KDP柱,但高度较低;两个强对流云体前部雨滴谱增宽时大滴端先增加,呈现双峰或多峰结构,靠近云体强中心小滴端(直径≤1 mm)数浓度呈量级增多,与云体前部强环境垂直风切有关;在降雹或强降水阶段,永定站冰雹为低密度冰雹,滴谱呈现弱双峰结构,漳平站则为单峰结构,两站的大滴(直径>3 mm)多为小冰雹融化造成;降雹后滴谱双峰结构主要由雨滴的碰并造成,云体后部滴谱收窄伴随着小粒子数浓度呈量级减少。
Abstract:Using the S-band dual polarization radar data and the surface precipitation phenomenon instrument data, the process of a hailstorm with severe convective weather in Yongding District of Longyan, Fujian Province on 27 March 2020 is analyzed, and compared with the characteristics of short-term heavy precipitation that occurred in Zhangping of Longyan at a similar time. The results show that the echo height of hail cloud in Yongding jumped before the hail shooting.There was a bounded weak echo in the front of the cloud moving direction, and the ZDR arc with an intensity of 2-4 dB also appeared there. The KDP column developed highly within the hailstorm simultaneously, up to 7-8 km. The KDP column also appeared in the heavy rainfall cloud in Zhangping, but its height 〖JP2〗was lower. There were hailstones aloft in Zhangping, but heavy rainfalls with large raindrops appeared on the ground for hailstones melting during falling. In the front of these two severe convective clouds, the large drop (>3 mm) ends increased firstly with raindrop spectrum boarding, showing double or multi-peaks. While the strong center of convective cloud was moving closer, the concentration of small rain drops (≤1 mm) increased in magnitude, which was related to the separate fall tracks of large and small raindrops caused by the strong environmental vertical wind shear in the front of convective cloud. In the hail shooting or heavy precipitation stage, the hailstones had low density and the raindrop spectrums showed weak double peaks at Yongding Station, while single-peak presented at Zhangping Station. The large drops at the two stations in this stage were mostly caused by the melting from small hails. The double-peak structure of the raindrop spectrum after hail shooting was mainly caused by the collision of raindrops. The raindrop spectrums at the tail of the cloud became narrow, decreasing in magnitude with small particles.
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基金项目:福建省自然科学基金项目(2019J01098)、福建省气象局开放式科研基金项目(2021K04)共同资助
引用文本:
何清芳,林文,张深寿,肖秀珠,张红梅,2022.闽西南地区一次春季降雹过程的双偏振参量及降水粒子谱特征[J].气象,48(7):856-867.
HE Qingfang,LIN Wen,ZHANG Shenshou,XIAO Xiuzhu,ZHANG Hongmei,2022.Dual Polarization Parameters and Precipitation Particle Spectrum Characteristics of a Spring Hail Event in Southwestern Fujian[J].Meteor Mon,48(7):856-867.