MODIS 3 km and 10 km aerosol optical depth for China: Evaluation and comparison
MODIS 3 km and 10 km aerosol optical depth for China: Evaluation and comparison
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中国MODIS 3 km和10 km气溶胶光学深度：评估与比较
DOI：
10.1016/j.atmosenv.2017.01.023
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发表时间：
2017-03-01
影响因子：
5
通讯作者：
Tong, Xuelian
中科院分区：
文献类型：
--
作者：
He, Qingqing;Zhang, Ming;Tong, Xuelian
尺度气溶胶光学厚度（AOD）分布，3公里的产品，预计将执行良好的气溶胶分析和识别当地的空气污染，特别是在严重污染的中国大气。然而，很少对区域差异进行详细评价。在本文中，我们评估了中国的MODIS 3公里和10公里的AOD产品对地面测量，并比较其性能的空间和时间变化。地面验证表明，这两个产品一般相关性以及地面观测。在空间上，在中国南方发达地区，3 km产品略优于10 km产品。从时间上看，这两种产品在春季和夏季的表现较差。大气云和下垫面是影响两种产品反演精度和数量的两个关键因素。对比分析表明，新推出的AOD产品清楚地显示出良好的关系，粗分辨率反演的空间和时间变化，但显着差异的细节。3km的气溶胶光学厚度产品提供了更好的气溶胶梯度，在中国西部的裸露地区的反演和阴天的日变化的一些尖峰。季节性比较表明，3 km气溶胶光学厚度产品在所有季节都高于10 km产品，特别是在春季和夏季。虽然中国的3公里产品一般表现略差于10公里产品，增加的信息的MODIS 3公里AOD产品显示出研究当地气溶胶特性的潜力，并可能促进空气污染的研究。(C)2017爱思唯尔有限公司版权所有
scale aerosol optical depth (AOD) distribution, the 3 km product, which is expected to perform well in analyzing aerosols and identifying local air pollution, especially in the severely polluted atmosphere of China. However, few detailed evaluations of regional variations have been conducted. In this paper, we evaluate MODIS 3 km and 10 km AOD products for China against ground-based measurements and compare their performance with respect to spatial and temporal variations. The ground validations indicate that the two products are generally correlated well to ground-based observations. Spatially, the 3 km product slightly outperform the 10 km product in well-developed areas of southern China. Temporally, both products perform worse during spring and summer. Atmospheric clouds and underlying surface are two key factors that influence the accuracy and number of retrievals for both products. The comparison analysis reveals the newly introduced AOD product clearly shows good relationships with the coarse resolution retrievals in spatial and temporal variation but significant differences regarding details. The 3 km AOD product provides better aerosol gradients, more retrievals in bare areas of western China and some spikes of diurnal variation in cloudy days. Seasonal comparisons show the 3 km AOD product is higher than the 10 km product in all seasons, especially during spring and summer. Although the 3 km product for China generally performs slightly worse than the 10 km product, the added information of the MODIS 3 km AOD product shows potential for studying local aerosol characterization, and may facilitate studies of air pollution. (C) 2017 Elsevier Ltd. All rights reserved.