2016年5月6日重庆万盛短时强降水雨滴谱特征分析  

Raindrop Spectrum Characteristics during a Short-time Strong Rainfall on 6 May 2015 in Wansheng of Chongqing

作　　者：张丰伟[1,2] 张逸轩 韩树浦[4] 王毅荣 ZHANG Fengwei;ZHANG Yixuan;HAN Shupu;WANG Yirong(Gansu Weather Modification Office,Lanzhou 730020,China;Key Laboratory of Atmosphere Sounding,China Meteorological Administration,Chengdu 610000,China;Chongqing Weather Modification Office,Chongqing 400000,China;Zhangye Meteorological Bureau,Zhangye 734000,China)

机构地区：[1]甘肃省人工影响天气办公室,甘肃兰州730020 [2]中国气象局大气探测重点开放实验室,四川成都610000 [3]重庆市人工影响天气办公室,重庆400000 [4]张掖市气象局,甘肃张掖734000

出　　处：《沙漠与绿洲气象》2019年第4期46-51,共6页Desert and Oasis Meteorology

基　　金：国家重点研发计划(2016YFC0401000);中国气象局大气探测重点实验室开放课题(KLAS201705);甘肃省气象局科研项目(Ms2019-18、Zcms2019-25);“祁连山云水资源开发利用评估创新团队”项目共同资助

摘　　要：利用激光雨滴谱仪对2016年5月6日四川盆地东南部与云贵高原交界处的重庆万盛地区一次由地形强迫抬升形成的短时强降水过程进行观测,分析了雨滴谱相关特征值变化情况。结果表明:雨滴谱能够较好地反映本次过程雨量的细节,谱型能够较好地反映对流的生消过程;雨滴的数浓度并不是影响雨强的决定性因素,粒子大小对雨强的贡献同样很重要;大粒子虽然很少,但对雨强的贡献远大于小粒子(如>3mm的粒子在雷达反射率因子中起主要贡献,达到97%);强烈的对流使大粒子在下落过程中破碎形成小粒子;参数Gamma分布能够较好地拟合本次降水过程雨滴谱分布;小粒子的速度谱大于实验典型值,与大粒子在下落过程中破碎形成小粒子有关。By using data from Parsivel precipitation particle spectrometer, the raindrop spectrum characteristics of a short -time strong precipitation occurred in Wansheng area of Chongqing in the junction of southeast Sichuan basin and Yunnan-Guizhou plateau on 6 May 2015 were analyzed. The results show that: the raindrop spectrum can better reflect the details of rainfall in this process, and the spectrum pattern can better reflect the process of convection. The number concentration of raindrops is not a decisive factor of rain intensity, Although there are few large particles, their contribution to rain intensity is much greater than that of small particles(for example, larger particles than 3mm play a major contribution in radar reflectivity factor, reaching 97%). Strong convection causes large particles to break up into small ones during their fall. The three-parameter Gamma distribution can well fit the distribution of raindrop spectrum in this precipitation process. The velocity spectrum of small particles is larger than the typical value of experiment, which is related to the formation of small particles in the falling process of large particles.

关 键 词：万盛 地形作用 短时强降水 雨滴谱 GAMMA分布 

分 类 号：P458.121[天文地球—大气科学及气象学]