地基遥感监测杭州地区气溶胶光学特性及大气环境变化

Monitoring Aerosol Optical Properties Using Ground Based Remote Sensing and the Change of Atmospheric Environment in Hangzhou Region

利用2006年4月—2007年4月杭州地区4个监测点CE-318太阳分光光度计的实测数据,精确反演了杭州地区实测日期气溶胶的光学特性,并分析了其时空分布特征.结果表明:随着大气气溶胶混浊度系数(β)的增加,波长指数(α)减小.大气气溶胶光学厚度(AOD)与β存在较好的线性相关(相关系数达0.90),且较为一致地反映了该地区春季大气污染严重,夏季相对清洁,晚秋初冬为过渡反弹期的季节变化特点;但在空间上二者又表现出不同的细节特征,主要是与气象参数和下垫面特征紧密相关.分析近地面ρ(PM10)的实测数据可知,AOD与ρ(PM10)的日均值具有很好的相关性,相关系数为0.74,明显高于二者小时均值的相关系数.

Based on the data observed at four monitoring sites in Hangzhou region with automatic sun tracing photometer CE-318 during April 2006 to April 2007, the aerosol optical properties were retrieved and its spatial and temporal variability were analyzed. Results indicate that with the increasing of Angstrom turbidity coefficient （ β ）, Angstrom wavelength exponent （α ） is decreasing, and the correlation between aerosol optical depth （AOD） and β has reached to 0.90. Both AOD and β reflect that atmosphere was polluted most severely in spring and was cleaner in summer, and late autumn to early winter is the transition phase. However, there still exist some small differences due to the weather condition and the land cover feature. To compare AOD with p（PM10 ）, the hourly mean AOD was averaged to match the hourly p（PM10 ） data. Unfortunately, it does not demonstrate a better correlation than that of the daily mean one, and the later＇s correlation reached 0.74.