中国3个AERONET站点气溶胶微物理特性分析及比较  

Analysis and comparison of the aerosol microphysical properties at three AERONET sites in China

作　　者：张志薇[1,2] 王宏斌[3] 张镭[1] 胡蝶[4] 田鹏飞[1] 梁捷宁[1] 王式功[1] 

机构地区：[1]兰州大学半干旱气候变化教育部重点实验室,大气科学学院，甘肃 兰州 730000 [2]江苏省气象服务中心，江苏 南京 210008 [3]江苏省气象科学研究所，江苏 南京 210009 [4]中国气象局兰州干旱气象研究所，甘肃 兰州 730020

出　　处：《中国环境科学》2014年第8期1927-1937,共11页China Environmental Science

基　　金：国家重大科学研究计划资助项目(2012CB955302);国家自然科学基金资助项目(41075104);中国气象局气溶胶与云降水重点开放实验室开放课题(KDW1303);兰州大学中央高校基本科研业务费专项资金(lzujbky-2013-246)

摘　　要：选取中国地区区域代表性较强且观测时间序列较长的3个AERONET站点（SACOL、香河和太湖）,分析了其气溶胶微物理参数特征.香河和太湖多年平均气溶胶光学厚度（AOD）分别为0.67±0.66和0.72±0.44,是SACOL AOD平均值（0.38±0.27）的近2倍,且AOD变化范围较大.SACOL春冬季AOD较大,夏秋季AOD较小;而香河和太湖夏春季较大,秋冬季较小.结合尺度分布、体积浓度等参数特征说明沙尘是SACOL春季最主要的气溶胶类型,香河春季受沙尘的影响也较严重,而太湖受沙尘影响的频率较香河要小的多;香河和太湖AOD最大值出现月份与细模态粒子体积浓度最大值出现月份一致,是由于细模态粒子的消光效率是粗模态粒子的3--4倍.细模态体积比（Vf/Vt）的年变化趋势与？ngstr？m波长指数（α）的年变化趋势相似,Vf/Vt和α均可以用来分析粒子尺度大小的年变化特征.但α〈0.75时,3个站点Vf/Vt均小于0.4,以粗模态粒子为主;α〉1.7时,Vf/Vt大于0.6,以细模态粒子为主;而0.75〈α〈1.7时,也是α出现概率最高的区间,3个站点Vf/Vt均在0.1∽0.8之间变化.The microphysical parameter characteristics of aerosol were analyzed at the AERONET stations located in SACOL, Xianghe and Taihu. The results showed that the annual average AOD at Xianghe and Taihu stations were 0.67±0.66 and 0.72±0.44, respectively, which were nearly 2times of the value of AOD at SACOL （0.38±0.27）. The standard deviation presented a significant temporal variability. At SACOL, the higher value of AOD was found in the spring and winter, and the lower value of AOD was found in the summer and fall. However, At Xianghe and Taihu, the higher values of AOD were found in the spring and summer, and the lower values of AOD were found in the fall and winter. Combined with the size distribution, volume concentration of aerosol particles, it can be concluded that dust was the main type of aerosols at SACOL in spring. At Xianghe and Taihu stations, the types of aerosol were mainly fine mode particles in summer due to the gas-to-particle conversion process. We could observe that for the measurements with Angstr6m exponent （α〈0.75）, there was a prevalence of coarse particles, because for the lower cc values, data with the fine mode volume fraction （Vf/Vt〉0.4） was almost unavailable. According to analysis we could establish the limit of the fine particle predominance with α〉1.7approximately. But for 0.75〈α〈1.7, the range of Vf/Vt was predominantly between 0.2and 0.8, which represented a great scattering character, hence it was not possible to establish a priori predominance for the fine or coarse particles.

关 键 词：气溶胶光学厚度 体积浓度 细模态体积比 Angstrom波长指数 

分 类 号：X513[环境科学与工程—环境工程]