基于2013—2015年CALIPSO星载激光雷达的Level 2数据集资料，对中国西北干旱半干旱区的气溶胶进行了分类研究，并对不同种类气溶胶在不同光学厚度下的年均发生频率做以分析。结果表明：沙尘气溶胶整体随气溶胶光学厚度值增大呈下降趋势；而污染沙尘型气溶胶在6类型气溶胶出现频率最高；大陆污染型气溶胶频率集中在[0.1，0.35]，随气溶胶光学厚度值的增大频率呈升高趋势；烟尘型气溶胶频率集中在[0.2，0.4]，在不同气溶胶光学厚度值情况下，频率较大陆污染型气溶胶高，随气溶胶光学厚度值的增大频率呈上升趋势；从四季来看，秋季和冬季当气溶胶光学厚度值大于0.1时，大陆污染型气溶胶频率明显高于沙尘气溶胶。春季，河西地区的气溶胶光学厚度高于其他三季，而在研究区域的南部和东南部，秋、冬季的气溶胶光学厚度值高于春、夏季。气溶胶光学厚度秋季 > 春季 > 夏季 > 冬季。
Based on CALIPSO observation data of Level 2 from 2013 to 2015, the Aerosols of arid and semi-arid areas in Northwest China are classified and the annual average frequency of different aerosol under different optical thickness is analyzed. It shows that the dust aerosol is decreasing with the increase of aerosol optical thickness, while the polluted dust frequency of the six types of aerosols is the highest; The frequency of the polluted continental aerosol is mainly in[0.1,0.35], and the frequency increases with the increase of aerosol optical thickness. The frequency of smoke aerosol is mainly concentrated in[0.2,0.4], in the case of different aerosol optical thickness, the frequency is higher than that of the polluted continental aerosol. With the increase of aerosol optical thickness, the frequency tends to increase. In autumn and winter, when the aerosol optical thickness is greater than 0.1, the frequency of the polluted continental aerosol is significantly higher than that of the dust aerosol. In spring, the aerosol optical thickness of Hexi area is higher than that of the other three seasons. In the southern and southeast parts of the study area, the aerosol optical thickness of autumn and winter is higher than that of the spring and summer two seasons. The aerosol optical thickness presents in autumn>spring>summer>winter.
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