不可溶性气溶胶对边界层暖云滴谱离散度影响的模拟研究  

Simulation study on the influence of insoluble aerosol on the dispersion of warm cloud droplet spectrum in boundary layer

作　　者：吴尚 李岩[1] 杨素英[1] 田芷洁 张志强 邓悦 吴祉贤 WU Shang;LI Yan;YANG Su-ying;TIAN Zhi-jie;ZHANG Zhi-qiang;DENG Yue;WU Zhi-xian(Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science&Technology,Nanjing 210044,China)

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,江苏南京210044

出　　处：《气象与环境学报》2020年第3期64-71,共8页Journal of Meteorology and Environment

基　　金：国家自然科学基金(41575133);江苏省高等学校大学生创新创业训练计划项目(201810300013Z);江苏省研究生科研创新计划项目(SJKY19_0964)共同资助。

摘　　要：基于一维分档MISTRA边界层云模式,模拟研究了内部混有不可溶核的硫酸铵气溶胶对边界层暖云微物理特征的影响。结果表明:边界层内湍流动能通量是影响暖云发展的重要因素。云中液态水含量、过饱和度以及云滴谱离散度均随云中的高度增加而增大。云滴谱标准差是影响云滴谱离散度变化的主要因子。在暖云发展阶段,不可溶性核会增加云中过饱和度,进而导致云滴谱分别向大尺度和小尺度端拓宽,云滴谱标准差增大,云滴谱离散度随时间增加而增大的程度增强;在暖云减弱阶段,不可溶核会造成云中大尺度端云滴数浓度减少,云滴谱变窄,标准差变小,云滴谱离散度逐渐减小的特征减弱。Based on the one-dimensional MISTRA(MIcrophysical STRAtus)boundary layer cloud model,the influence of ammonium sulfate aerosol with insoluble core on the microphysical characteristics of the boundary layer warm cloud was simulated.The turbulence energy flux in the boundary layer is an important factor affecting the development of warm clouds.The liquid water content,supersaturation and cloud droplet spectrum dispersion in the cloud increase with the height in the cloud.The standard deviation of cloud droplet spectrum is the main factor affecting the variation of cloud droplet spectrum dispersion.In the warm cloud development stage,the insoluble core will increase the supersaturation in the cloud,which will cause the cloud droplet spectrum widening to large scale end and small scale end.The standard deviation of the cloud droplet spectrum will increase,and the cloud droplet spectrum dispersion will increase with time.In the warm cloud weakening stage,the insoluble core will cause the cloud droplet number concentration of the large-scale end of the cloud to decrease,the cloud droplet spectrum becomes narrower,the standard deviation becomes smaller,the characteristics of decreasing dispersion of cloud droplet spectrum are weakened.

关 键 词：边界层 离散度 MISTRA模式 云滴谱 不可溶核 

分 类 号：P401[天文地球—大气物理学与大气环境]