我国不同背景地区大气冰核浓度特征及参数化

Characteristics and parameterization of atmospheric ice nucleating particles concentration in different background areas of China

为深入了解我国不同背景地区大气冰核浓度特征,本文通过在我国不同地区进行大气冰核及气溶胶的采样观测。研究发现:观测期间,黄山光明顶的冰核浓度数值均值为2.208 L^(-1);南京地区的冰核浓度数值均值为7.16 L^(-1);泰山山顶的冰核浓度数值均值为3.455 L^(-1);泰山山底的冰核浓度数值均值为4.818 L^(-1);新疆地区无沙尘天气冰核浓度数值均值为11.27 L^(-1);新疆有沙尘天气冰核浓度数值均值为51.8125 L^(-1)。研究给出了不同背景地区的大气冰核浓度的温度谱和湿度谱的分布。同时,研究发现,冰核数浓度与粒径大于0.5μm的气溶胶粒子数浓度的相关性较高,也就是气溶胶粒子中大颗粒所占比例越高,冰核数浓度越高。此外,还建立了基于活化温度、过饱和度以及大于0.5μm气溶胶粒子数浓度的冰核参数化方案,它们可以分别适用于沙漠地表,相对清洁的背景区域和人为污染较多的城市背景。

In order to understand the characteristics of Ice Nucleating Particles(INP)concentration in different background areas of China,this paper conducted sampling observations of INP and aerosols in different areas,which found that:the average value of INP concentration in the top of Huangshan Mountain,Nanjing,the top of Taishan Mountain,the bottom of Taishan Mountain,Xinjiang without dust and Xinjiang with dust was 2.208,7.16,3.455,4.818,11.27,and 51.8125 L^(-1),respectively.The distributions of temperature and humidity spectra of INP concentrations in different background areas are given.At the same time,it is found that there is a high correlation between the number concentration of INP and the number concentration of aerosol particles with the size larger than 0.5μm,which means that the higher the proportion of large particles in aerosol particles is,the higher the number concentration of INP is.In addition,parameterizations of INP based on activation temperature,supersaturation,and aerosol particle number concentration larger than 0.5μm were developed,and they can be applied to desert,relatively clean background areas,and contaminated urban areas,respectively.