| 六盘山区一次非典型冰雹天气过程微物理量特征的分析 |
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| 引用本文： | 陶涛,张立新,桑建人,吕晶晶,聂晶鑫. 六盘山区一次非典型冰雹天气过程微物理量特征的分析[J]. 干旱区地理, 2020, 43(2): 299-307. DOI: 10.12118/j.issn.1000-6060.2020.02.03 |
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| 作者姓名： | 陶涛 张立新 桑建人 吕晶晶 聂晶鑫 |
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| 作者单位： | 1. 南京信息工程大学大气科学学院;2. 中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室;3. 中国气象局气溶胶与云降水重点开放实验室;4. 南京信息工程大学大气物理学院 |
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| 基金项目： | 国家自然科学基金重点项目（41775139）资助 |
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| 摘 要： | 利用地面激光雨滴谱仪捕捉2017年7月14日夜间发生在六盘山区的一次强对流天气降雹过程,其降雨和降雹微物理特征表明:降雹时,粒子各项微物理特征量明显增大,其中数浓度和平均动能通量增幅最为明显,分别增长了6.3倍和13倍。降雹初期,粒径较大的冰雹粒子增长较快,随着能量的释放,对流减弱,粒径较小的冰雹粒子增加较快。Gamma型分布更适合拟合降雹前后的粒子谱。用粒子下落末速度公式V=aDb拟合此次降雹过程中的粒子速度效果很好,相关系数超过0.98,a的变化范围在4.55～5.02之间,b的变化范围在0.53～0.59之间。
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| 关 键 词： | 六盘山 冰雹云 冰雹粒子谱 微物理特征 |
| 收稿时间： | 2019-03-22 |
A case analysis of microphysical characteristics ofatypical hail formation over Liupan Mountain,China |
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| TAO Tao,ZHANG Li-xin,SANG Jian-ren,LV Jing-jing,NIE Jing-xin. A case analysis of microphysical characteristics ofatypical hail formation over Liupan Mountain,China[J]. Arid Land Geography, 2020, 43(2): 299-307. DOI: 10.12118/j.issn.1000-6060.2020.02.03 |
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| Authors: | TAO Tao ZHANG Li-xin SANG Jian-ren LV Jing-jing NIE Jing-xin |
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| Abstract: | Hail is one of the most important destructive weatherphenomena in Ningxia Province,China.Its circulation background andspatiotemporal distribution characteristics have been carefully studied by manyresearchers,but the research on hail with the newest generation of detectionequipment is not very clear.This study addressed this gap by examining hailevents with measurements of instantaneous precipitation intensity,total numberof precipitation particles,cumulative precipitation,visibility,and radarreflectivity that were obtained using a DSG5 laser raindrop spectrometer.Theprecipitation and microphysical characteristics of hail falling during severeconvective weather in the Liupan Mountain area of Ningxia Province on the nightof July 14,2017,were systematically analyzed.The results showed as follows: (1)during the hail process,the microphysical characteristics of the precipitationparticles increased significantly relative to the baseline.In particular,thenumber density and mean kinetic energy flux increased to 6.3 and 13 times morethan their initial values,respectively.(2) In the early hailing stage,largehail particles grew faster than did smaller particles.However,with the releaseof energy,convection weakened and hailstones of smaller size increasedrapidly.(3) Our data showed that a gamma type distribution was mostsuitable for fitting the particle distribution characteristics before and afterthe hail process.(4) Finally,we found that particle velocity during the hailfalling process was well fitted by using the particle falling velocity formula V=aDb(R2≥0.98).Fitted to our data,the constant aranged from 4.55 to 5.02,while bvaried from 0.53 to0.59. |
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| Keywords: | Liupan Mountain hail cloud hail particle sizedistribution microphysical characteristics |
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