新疆博斯腾湖地区气溶胶光学厚度特性地基遥感

为加强新疆戈壁地区沙尘监测,为区域气候变化研究和局地卫星遥感精度验证提供地基观测依据,利用CE-318太阳光度计在博斯腾湖地区2010年4～12月测得的太阳直接辐射数据,应用消光法反演了大气气溶胶光学厚度(AOD)和Ångström波长指数α并分析其变化特征。结果表明,该地区550 nm AOD平均值为0.33±0.22。当α>0.5时,550 nm AOD日均值小于0.25; 当α<0.5时,550 nm AOD日均值大于0.3。AOD日变化在非沙尘天气时有3种类型:平稳型、上升型和下降型。沙尘天气时有3种类型:上升型、早晨傍晚高且午时有低值、早晨傍晚低且午时有高值。AOD季节变化是春季最大,冬秋次之,夏季最小。当地年均大气透明度较好,气溶胶成分单一,沙尘天气是影响当地大气浑浊度的主要原因。

Ground-based measurements of aerosol optical properties in Bosteng lake area

To strengthen monitoring of dust weather and provide ground-based observing data for regional climate change research and remote sensing, was used the direct solar radiation data measured by a CE-318 sun photometer in Bositeng lake area was used, and the aerosol optical depth(AOD)and Ångström parameter α were retrieved by extinction method and analyzed. During the study period, the mean value of 550 nm AOD was 0.33±0.22. When α greater than 0.5, the mean value of 550 nm AOD was smaller than 0.25; When α smaller than 0.5, the mean value of 550 nm AOD was greater than 0.3. There were three patterns of diurnal evolution in non-dust day: relatively steady, a general trend of increase, and a general trend of decrease. There were three patterns of diurnal evolution in dust day: a general trend of increase, a peak value in the morning and evening,and a peak value at noon. The seasonal variation of AOD is larger in spring and winter, smaller in autumn and the smallest in summer. The result indicates that the local average annual atmospheric transparency is good, with dust weather the main reason affecting the local atmospheric turbidity.