西藏那曲一次对流云降水及云微物理数值模拟  

On Numerical Simulation of a Case of Convective Cloud Precipitation and Its Micro-Physical Characteristics at Naqu,Tibetan Plateau

作　　者：郭艺媛 华维 侯文轩[1] 李茂善 GUO Yiyuan;HUA Wei;HOU Wenxuan;LI Maoshan(School of Atmospheric Sciences/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province/ Engineering Laboratory of Meteorological Disasters Prediction and Early Warning of Sichuan Province, Chengdu University of Information Technology, Chengdu 610225, China;Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China)

机构地区：[1]成都信息工程大学大气科学学院/高原大气与环境四川省重点实验室/四川省气象灾害预测预警工程实验室,成都610225 [2]中国科学院大气物理研究所竺可桢—南森国际研究中心,北京100029

出　　处：《西南师范大学学报（自然科学版）》2022年第6期68-77,共10页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：国家重点研发计划项目(2018YFC1505702);第二次青藏高原综合科学考察研究项目(2019QZKK010203,2019QZKK010304);国家自然科学基金项目(41775072,42075019);四川省杰出青年科技人才计划项目(2019JDJQ0001).

摘　　要：利用中尺度数值模式(WRF)对2015年8月13日青藏高原那曲地区一次对流云降水过程及云微物理特征进行了模拟.结果表明,WRF模式能够较好模拟本次对流云降水的落区、量级及其日变化等特征.本次对流云降水以冰相过程为主,冰晶粒子、雪粒子、霰粒子、云水粒子和雨水粒子由高到低依次分布,其中霰粒子含量最大.液态降水主要源于霰粒子的融化过程,暖雨过程中雨水和云水的微物理过程也对降水有一定影响.此外,位于高层的雪粒子通过冰晶的贝杰龙过程增长,之后通过碰冻过冷雨滴形成霰粒子胚胎,而霰粒子在上午依靠高层碰并雪和低层碰并过冷雨滴以及中层其本身淞附过程而增长,午后则通过中低层淞附过冷云水和碰并过冷雨滴过程增长.Based on Weather Research and Forecasting Model,a case of convective cloud precipitation at Naqu over Tibetan Plateau on August 13,2015 was simulated and its cloud microphysical characteristics was also analyzed.The results show that the WRF model has the ability to simulate the area,magnitude and daily variation characteristics of this convective cloud precipitation process.The distribution of different phase particles in the cloud from high to low level are ice crystals,snow particles,grapples,cloud droplets and rain droplets respectively,with the largest content in grapples.The entire precipitation process is dominated by the ice phase process.One of the ice phase process,the melting of graulic particles,is the main source of the precipitation while the microphysical process of rainwater and cloud droplets in the warm rain process also has a weak contribution.Through the Wegener-Bergeron-Findeisen process,snow particles grow at the upper level,and then touch and freeze the cold raindrops,forming the embryos of the hail particles.In the early morning,the hail particles collide with snow on the upper layers,with the cold raindrops on the lower layers and with itself on the middle layer.In the afternoon,it grows through the low-and-middle-level yongs attached to the cold cloud water,and the cold raindrops.

关 键 词：青藏高原 对流云降水 云微物理特征 数值模拟 

分 类 号：P456.7[天文地球—大气科学及气象学]