沙尘气溶胶影响新疆对流云降水的数值模拟研究  

Numerical Simulation of the Influence of Dust Aerosols on Convective Cloud Precipitation in Xinjiang

作　　者：孙博爱 银燕[1,2] 陈倩[1] 况祥 陈泔真 邹泽庸 SUN Boai;YIN Yan;CHEN Qian;KUANG Xiang;Chen Ganzhen;ZOU Zeyong(Nanjing University of Information Science and Technology/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing 210044;Key Laboratory of Cloud Physical Environment of China Meteorological Administration,Beijing 100081)

机构地区：[1]南京信息工程大学/中国气象局气溶胶与云降水重点开放实验室,南京210044 [2]中国气象局云雾物理环境重点开放实验室,北京100081

出　　处：《大气科学》2024年第3期1173-1188,共16页Chinese Journal of Atmospheric Sciences

基　　金：西北人工影响天气工程项目ZQC-R18211;中国气象局西北区域人影建设研究试验项目RYSY201902;国家重大科技基础设施项目“地球系统数值模拟装置”;国家自然科学基金项目42275078。

摘　　要：为研究沙尘气溶胶层对云和降水的影响,本文使用耦合了分档云微物理方案(SBM)的Weather Research and Forecast Forecasting model(WRF)高分辨率天气模式(WRF-SBM),模拟了2016年7月8日发生在新疆阿克苏地区的一次强对流天气过程,并分别讨论了处于不同高度的沙尘层对云动力、微物理和降水形成过程中的作用。结果表明:沙尘层处于对流层中低层时,沙尘气溶胶作为云凝结核(cloud condensation nuclei,CCN)对云微物理过程的影响比其处于中高层时更明显,沙尘气溶胶使得CCN增加,云滴数浓度增加,云滴有效半径减小,降水延迟;而沙尘层处于对流层中高层时,沙尘气溶胶作为冰核(ice nuclei,IN)对云微物理过程影响更明显,沙尘气溶胶使得IN浓度增加,冰晶数量增加,雪、霰、雹的凇附增长率增加,参与融化过程的冰相粒子增多,降雨率增大。本文仅讨论了发生在新疆的这次对流天气过程对处于不同高度的沙尘气溶胶层的可能响应,要全面认识沙尘气溶胶对不同类型云降水过程的影响,需要进行更多的、有观测资料约束的模拟研究。To study the influence of the dust aerosol layer on cloud and precipitation,this paper simulated a convective process in Aksu,Xinjiang,using the Weather Research and Forecasting(WRF)high-resolution weather model coupled with a spectral bin microphysics(SBM)scheme.The effects of the aerosol layer on cloud dynamics,microphysics,and precipitation processes at different heights are discussed.The results show that when the dust aerosol is in the lower layer,cloud condensation nuclei(CCN)have a more obvious effect on the cloud microphysical process.As the CCN increases,the cloud droplet concentration increases,the effective radius of the cloud droplet decreases,and precipitation delays.When the dust aerosol is high,ice nuclei(IN)have a more obvious influence on the cloud microphysical process.With an increase in the IN concentration,the number of ice crystals increases,the growth process of snow,graupel,and hail is enhanced,the number of ice particles involved in the melting process increases,and the rain rate increases.This paper only discusses the possible response of the dust aerosol layer to the convective weather process that occurred in Xinjiang at different heights.Further simulation studies that are constrained by observation data are necessary to gain a comprehensive understanding of the influence of dust aerosols on different types of clouds and precipitation processes.

关 键 词：沙尘气溶胶 分档微物理方案 对流云 

分 类 号：P426.51[天文地球—大气科学及气象学]