Annual observation and analysis of aerosol optical properties in Tianjin coastland

天津近岸气溶胶光学性质周年观测与分析（英文）

Seasonal variation of the Tianjin coastal atmospheric aerosol opticalproperties are important for improving the atmosphere correction precision of marinesatellite and learning the environment of the boundary between the Bohai Sea and theland. In this paper, the aerosol optical data of Tianjin coastal area from April 2010 toMay 2011 were observed by using the CE317 Solar Photometer, and the aerosol opticalproperties were analyzed. The results show that: Aerosol Optical Thickness (AOT)spectra are basically in accord with Angstrom relationship; there are three basic typesof AOT daily variations, which are rising type, levelling type, and declining type; inTianjin Coastland, the mean value of AOT is highest in autumn, which is 0.686. Thevalue is lower in spring and summer, and hits the lowest point in winter. Angstromexponent α increases successively from spring, summer, autumn to winter. Due to thedusty, the angstrom exponent α in spring is lowest, the mean of which is 0.854.Compared with Qingdao Coastland, the atmospheric aerosol optical properties presentcharacteristics of regionality.

天津近岸大气气溶胶光学特性季节变化对提高海洋卫星的大气校正精度和了解天津与渤海海陆交界地区的环境具有重要意义。本文利用CE317太阳光度计定点观测了天津近岸2010年4月到2011年5月气溶胶光学数据,分析了渤海湾近岸地区气溶胶周年光学特性。结果表明:气溶胶光学厚度(Aerosol Optical Thickness,AOT)光谱基本满足Angstrom关系;AOT日变化基本有三种变化趋势:上升型,平稳型,下降型;天津近岸秋季AOT最高,平均值0.686,春夏次之,冬季最低;Angstrom指数α春夏秋冬依次升高,春季由于沙尘的影响,其Angstrom指数α最小,平均值为0.854。该结果与黄海近岸的青岛地区作了比较分析,表明了气溶胶光学性质的区域性。