一次強(qiáng)降水風(fēng)暴回波合并前后雙偏振特征分析

doi:10.12306/2022jms.0030

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一次強(qiáng)降水風(fēng)暴回波合并前后雙偏振特征分析
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                        10.12306/2022jms.0030
                    
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中圖分類號(hào):P412.25;P458.121.1
基金項(xiàng)目:山東省自然科學(xué)基金項(xiàng)目(ZR2020MD053);山東省氣象局科研項(xiàng)目(2019sdqxz01)

Analysis of the polarimetric characteristics of heavy rainfall storms before and after echoes mergence

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摘要:

基于濟(jì)南S波段雙偏振多普勒天氣雷達(dá)探測(cè)數(shù)據(jù),結(jié)合衛(wèi)星、探空和地面實(shí)況資料,對(duì)2020年8月6日發(fā)生在山東曲阜一帶的強(qiáng)降水風(fēng)暴合并前后雙偏振參量特征和微物理特征進(jìn)行分析。結(jié)果表明:(1)云帶之間產(chǎn)生多次合并,合并后風(fēng)暴加強(qiáng)發(fā)展,產(chǎn)生較大的分鐘降水量和累計(jì)降水量。(2)新生單體最典型的雙偏振特征是具有大的Z_DR和CC,以少許液態(tài)粒子為主;新生單體迅速發(fā)展過程中上升氣流強(qiáng)度明顯加強(qiáng),出現(xiàn)明顯的K_DP柱和Z_DR柱,液態(tài)粒子濃度明顯增大并出現(xiàn)偏大的液態(tài)粒子。(3)合并后發(fā)展的主要特征是,風(fēng)暴頂高、強(qiáng)回波區(qū)頂高和K_DP柱明顯增高,-10℃層高度以下,特別是在風(fēng)暴底層K_DP值明顯增大。(4)合并之后風(fēng)暴發(fā)展最典型的微物理特征是,-10℃層高度之下液態(tài)雨滴粒子濃度迅速增大,-10℃層高度之上冰晶或霰粒子層的厚度明顯增大。發(fā)展旺盛的風(fēng)暴中、低層有豐富的液態(tài)水,風(fēng)暴高層含有豐富的冰相粒子,從而導(dǎo)致風(fēng)暴產(chǎn)生高強(qiáng)度降水。

Abstract:

Based on the S-band dual polarization Doppler weather radar data of Jinan, combined with satellite, sounding and surface meteorological observation data, the characteristics of dual polarization parameters and microphysics of heavy rain storms before and after the merging, occurred in Qufu of Shandong Province on 6 August 2020, were analyzed. Rresults show that:(1) there were multiple mergers between two cloud bands, and after the merger, the storm strengthened and developed, resulting in larger minute rainfall and accumulated rainfall. (2)The typical dual polarization characteristics of initial cells are large Z_DR and CC, indicating the presence of a little liquid particles. The typical dual polarization characteristics of growth of initial cells are the appearance of K_DP column and Z_DR column, indicating the enhancement of updraft, the increases in the concentration of liquid particles significantly, and the appearance of large liquid particles. (3)The main characteristics of development of the merging echo are increases in the height of higher strong echo, storm top and K_DP column, in the K_DP values under -10℃ layer, especially at the bottom of storm. (4) The typical microphysical features of development of the merging echo are the increasing rapidly in concentration of liquid raindrops and the thickness of ice crystals or graupels layer. There are abundant liquid water in the middle and lower level of the exuberant storm, and abundant ice phase particles in the upper level of the exuberant storm, leading to high-intensity precipitation on the surface.

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黃秀韶,刁秀廣,韓永清,李芳.一次強(qiáng)降水風(fēng)暴回波合并前后雙偏振特征分析.氣象科學(xué),2022,42(3):410-419 HUANG Xiushao, DIAO Xiuguang, HAN Yongqing, LI Fang. Analysis of the polarimetric characteristics of heavy rainfall storms before and after echoes mergence. Journal of the Meteorological Sciences,2022,42(3):410-419

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收稿日期:2022-01-26
最后修改日期:2022-03-05
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在線發(fā)布日期: 2022-07-15
出版日期: 2022-06-25

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