自定义气溶胶模式下兰州及周边地区气溶胶光学厚度的反演

Retrieval of Aerosol Optical Depth with a Custom Aerosol Model over Lanzhou and Its Surroundings

通过自定义气溶胶模式,选取类大陆型气溶胶,结合兰州大学半干旱气候与环境观测站(SACOL)气溶胶实测资料建立的气溶胶数谱模式,反演兰州市及周边地区100km×100km范围内的气溶胶光学厚度(AOD)。结果表明,在不同气溶胶模式下,AOD分布表现出一些共同特征:在兰州市西固区(工业区域)存在一个AOD高值区,兴隆山、刘家峡水库地区AOD值较低,而在榆中县城、临夏市等城镇区也表现出AOD值高于周边地区。对比反演结果与地面实测资料,发现采用自定义气溶胶模型反演的精度有很大提高。

With a Custom Aerosol Model and class continental aerosol, a number spectral model of aerosol was obtained by the observation at the semi-arid climate and environment observatory of Lanzhou University（SACOL）. Aerosol optical depth（AOD） over Lanzhou and its surroundings in a 100 km×100 km range was retrieved. The results show that the distribution of AOD retrieved by different aerosol models have some common features, there are a high value area in Xigu industrial district of Lanzhou and lower values in Xinglong Mountain and Liu Jiaxia Reservoir, while in Yuzhong and Linxia as well as other small towns, it also shows higher values of AOD than that in its surrounding areas. Comparising the retrieved results and ground-based observations show that the retrieval accuracies of AOD have improved significantly with the custom defined aerosol model.