气溶胶云下清除理论及观测研究  

Theoretical and observational study on below-cloud rain scavenging of aerosol particles

作　　者：王瑛[1] 朱彬[1] 康汉青[1] 高晋徽[1] 江琪[1] 刘晓慧[1] 

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

出　　处：《中国科学院大学学报（中英文）》2014年第3期306-313,321,共9页Journal of University of Chinese Academy of Sciences

基　　金：国家自然科学基金(41030962;41275143);公益性行业(气象)科研专项(201206011);江苏省高校自然科学研究重大基础研究项目(12KJA170003);江苏省"333"高层次人才培养工程项目;江苏省"六大人才高峰"计划资助

摘　　要：基于气溶胶云下清除过程中起决定作用的雨滴与气溶胶碰并机制理论，详细探讨碰并系数与雨滴和气溶胶直径的关系，并针对雷暴天与非雷暴天，从理论上对比这2种天气条件下雨滴碰并不同尺度气溶胶的清除系数．利用2011年6—8月黄山光明顶与汤口寨西气溶胶浓度观测数据，对比黄山地区雷暴与非雷暴天气条件下的清除系数的实测值与理论值，并讨论黄山地区清除系数与雨强的关系．结果表明，在气溶胶粒径为0．01～0．1μm时，清除系数实测值与理论值变化趋势一致，实测值高出理论值5—6倍；在0．1～1μm粒径段，清除系数的实测值雷暴天高于非雷暴天；且清除系数与雨强呈正指数关系，相关系数为0．81．As the collision theory for raindrop and aerosol particle is important in below-cloud scavenging, collision efficiency as a function of raindrop diameter （Dp） and aerosol diameter （ dp ） is discussed. The scavenging coefficient （SC） under thundercloud is 5 to 6 times higher than those under non-thundercloud when dp is less than 1 μm. Field measurements of aerosol number concentration at bottom and top of Huangshan mountain from June to August of 2011 were used to analyze the variation characteristics of observed and theoretical SCs. The results show that observed SC variation for ultrafine-sized particle is in reasonable agreement with the theoretical one, and the observed SC is 5 to 6 times higher than the theoretical SC. Submicron-sized particle SC is higher under thundercloud than that under non thundercloud. Based on the observations, exponential relationship between the hour-averaged SC and rainfall intensity is derived, in which the correlation coefficient is 0.81.

关 键 词：清除系数 碰并系数 黄山 雷暴 非雷暴 

分 类 号：P41[天文地球—大气科学及气象学]