亚青会期间南京地区大气冰核的观测分析  

Measurement analysis of atmospheric ice nuclei in Nanjing during the Asian Youth Games

作　　者：高任杰 银燕[1] 蒋惠[1] 袁亮[1] 李琦[1] 

机构地区：[1]南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室,南京210044

出　　处：《气象科学》2017年第2期141-150,共10页Journal of the Meteorological Sciences

基　　金：国家自然科学基金资助项目(41030962);江苏高校优势学科建设工程项目(PAPD)

摘　　要：2013年8月2—26日亚青会期间对南京地区进行了大气冰核的观测采样,同时结合气溶胶、气象要素等观测资料,研究了南京地区大气冰核浓度的分布特征,探究在污染管控措施下大气气溶胶的变化是否对冰核浓度产生影响。结果表明,大气气溶胶浓度在污染管控的措施下明显降低,冰核浓度在多种因素影响下没有明显降低的变化趋势,但有明显的日变化特征。燃放烟花的空气污染时刻,大气冰核浓度随污染物浓度的增加会明显增加。当活化湿度达到水面过饱和,温度范围为-12^-23℃时,南京夏季的冰核浓度范围为0.38~50.55 L^(-1)。将活化温度和冰面过饱和度同时加入到参数化公式中得到大气冰核浓度N(T,S_i)=0.003 1exp(-0.254 9T+0.161 6S_i)。进一步分析冰核浓度与PM_(2.5)、PM_(10)、PM_(10)-PM_(2.5)的关系,发现冰核浓度与PM_(10)-PM_(2.5)的相关性较高,相关系数为0.55,说明大粒径气溶胶粒子更容易充当冰核,大粒径气溶胶在冷云过程中起着更为重要的作用。During the Asian Youth Games from August 2 to 26,2013,the atmospheric ice nuclei in Nanjing was measured and sampled.Moreover,combined with the aerosols and meteorological elements observation data,the distribution characteristics of ice nuclei concentration and the influence of aerosols variation on ice nuclei concentration were further analyzed under the pollution controls.Results show that the atmospheric aerosol concentration significantly decreased under the measurements of pollution control,and the ice nuclei concentration did not decrease under the influence of a variety of factors,but had obvious diurnal variation.Ice nuclei concentration will significantly increase as the increasing of various pollutants' concentration.The observed ice nuclei concentration was 0.38 L^(-1)to 50.55 L^(-1)at the activation temperature from-12 ℃ to-23 ℃ and the saturation with respect to water is 100%.Based on measurements,a parametric equation N( T,S_i) = 0.003 1exp(-0.254 9 T+0.161 6S_i) was developed to represent the variations of IN concentration with temperature and supersaturation.The aerosols in the size range of 1-10 μm acting as ice nuclei were more than that in other size ranges.The further analysis on the rela-tionship between ice nuclei concentration and PM_(2.5),PM_(10),PM_(10)-PM_(2.5)found that the correlation of ice nuclei concentration and PM_(10)-PM_(2.5)was more obvious and the correlation coefficient was 0.55,which indicated that aerosol particles in the larger size range are more likely to act as ice nuclei and then have more important effects on the formation process of cold clouds.

关 键 词：大气冰核 气溶胶 静力真空水汽扩散云室 

分 类 号：X169[环境科学与工程—环境科学]