南京地区大气冰核浓度的测量及分析.docVIP

 南京地区大气冰核浓度的测量及分析# 杨磊1，银燕1，杨绍忠2，蒋惠1，肖辉1，陈倩1，苏航1，陈聪1** （1. 南京信息工程大学，中国气象局大气物理与大气环境重点开放实验室，南京 210044； 5 10 15 20 25 30 35 40 2. 中国气象科学研究院中国气象局云雾物理重点开放实验室，北京 100081） 摘要：2011 年 5~8 月期间使用混合型云室以及静力扩散云室对南京不同成核机制的大气冰 核进行了观测，进而分析了近地层冰核浓度特征。结果表明：观测期间活化温度为-20时 总冰核浓度为 21.95 个/L，在水面过饱和度和冰面过饱和度分别为 5%时，冰核浓度分别为 0.93 个/L 以及 0.29 个/L。晴好条件下冰核浓度具有明显的日变化特征，白天冰核浓度高于 夜间；在下午时段冰核浓度达到全天最高值，这说明大气冰核和人类活动、工业污染有关。 研究发现，降水对冰核的清除作用明显，台风系统过程中冰核浓度明显增加。南京地区冰核 浓度随温度降低成指数增加，总冰核浓度在-15时为 1 个/L。冰核浓度随着湿度增加而增 加。后向轨迹模式分析表明西南气团对-25冰核贡献很大，局地气团以及海洋气团则使得 -10和-15冰核显著增加，局地气团冰核浓度小于海洋气团。7 月 29 日南京周边火点明 显增加对应较高冰核浓度说明燃烧产物也会增加冰核浓度。 关键词：大气冰核；混合型云室；静力扩散云室 中图分类号：X169 The Measurement and Analysis of Atmospheric Ice Nuclei in Nanjing Yang Lei1, Yin Yan1, Yang Shaozhong2, Jiang Hui1, Xiao Hui1, Chen Qian1, Su Hang1, Chen Cong1 (1. Key Laboratory for Atmospheric Physics and Environment of China Meteorological Administration, Nanjing University of Information Science Technology, NanJing 210044; 2. Key Laboratory of Cloud Physics and Weather Modification of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081) Abstract: The observation data of Ice Nuclei(IN) in Nanjing which was observed by the mixing cloud chamber and static diffusion cloud chamber was analyzed from May to August in 2011 to research the characterization of different ice nuclei concentrations. The results show that: during the observation period, the mean concentration of total ice nuclei is 21.949 L-1, the concentration of IN under supersaturation with respect to water and ice equals 5% is 0.928 L-1 and 0.291 L-1, respectively. The IN under favorite conditions has a diurnal variation. The concentration of IN in daytime is larger than at night and reaches the maximum in the afternoon which indicates that atmospheric IN is significantly influenced by human activities and industrial pollution. The removal of precipitation on IN is obviously, and the concentration of IN increases during the typhoon system. IN in Nanjing aera increases exponentiall