黄山地区大气冰核的观测分析.docVIP

 黄山地区大气冰核的观测分析# 蒋惠1，银燕1，杨磊1，苏航1，杨绍忠2** （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：本文通过分析 2011 年 5~9 月黄山地区 3 个高度的混合云室和静力扩散云室观测得到 的大气冰核的观测资料，研究了不同成核机制下 3 个高度冰核浓度特征以及冰核与气溶胶之 间的相关性。分析结果发现：在黄山光明顶，活化温度为-20时所有成核机制下的大气冰 核总浓度为 16.6 个/L，相对水面过饱和度为 5%时的冰核浓度为 0.890 个/L，相对冰面过饱 和度为 5%时的冰核浓度为 0.105 个/L。春秋季大气冰核浓度高于夏季，这是因为春秋季节 较多的沙尘增加冰核浓度，而夏季较多的降雨清除了大量的冰核。冰核受到活化温度和湿度 的影响明显。对比黄山 3 个高度冰核浓度发现山底冰核浓度高于山顶，这说明近地面较多气 溶胶导致地面附近冰核浓度较高。通过分析冰核浓度与不同粒径段气溶胶数浓度相关性发 现，大气冰核数浓度与粒径在 1.2~20μ m 范围内的大气气溶胶粒子数浓度的相关性较好，说 明气溶胶粗粒子对大气冰核的贡献更大。气团轨迹分析结果表明海洋性气团影响下的大气冰 核浓度最高，局地空气污染次之，而大陆性气团影响下的冰核浓度最低，并结合气溶胶数浓 度分析，发现海洋性气团中的高冰核浓度主要是受粒径在 1.2~20μ m 范围内的气溶胶大颗粒 数浓度的影响导致。 关键词：大气冰核；混合型云室；静力扩散云室；凝华核化；凝结冻结核化 中图分类号：P401 The measurement and analysis of atmospheric ice nuclei at Mt Huang JIANG Hui1, YIN Yan1, YANG Lei1, SU Hang1, YANG Shaozhong2 (1. Key Laboratory for Atmospheric Physiscs and Environment of China Meteorological Bureau, Nanjing University of Information Science and Technology, Nanjing 210044; 2. Key Laboratory of Cloud Physics and Weather Modification of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081) Abstract: In this paper, the characteristics of ice nuclei(IN) concentration and the correlation between ice nuclear and aerosols were studied, by analyzing the data of ice nuclear observed by mixing cloud chamber and the static diffusion chamber at three different heights in Huangshan region from May to September 2011. Analysis showed that: when the activation temperature (T) was -20℃, at the peak of Mt Huang, the total number concentration of IN measured by the mixing cloud chamber was 16.6 L-1. When the supersaturation with respect to water and ice (Sw and Si) was 5% respectively, the number concentration of IN measured by the static diffusion chamber was 0.890 and 0.105 L-1 respectively. Ice nuclei concentration in spring and autumn was higher than that in summer, this is because the more dust in spring and autumn increased