Evaluation of the MODIS C6 Aerosol Optical Depth Products over Chongqing, China

Evaluation of the MODIS C6 Aerosol Optical Depth Products over Chongqing, China
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中国重庆 MODIS C6 气溶胶光学深度产品评估

DOI:
10.3390/atmos8110227
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发表时间:
2017-11
期刊:
影响因子:
2.9
通讯作者:
Yang Fumo
Yang Fumo
中科院分区:
地球科学4区
文献类型:
--
作者:
Shi Guangming;Liu Ruiling;Wang Dingyi;Yang Fumo

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利用中分辨率成像光谱仪收集的10/3 km暗目标(DT)和深蓝(DB)算法得到的C6气溶胶光学厚度(AOD)数据,在中国所在的西南山区特大城市重庆首次利用地面观测的AOD进行了评估。验证结果表明,10/3kmDT算法得到的MODIS AOD与太阳光度计的AOD相当,但略有高估。然而,与太阳光度计相比,DB算法大大低估了MODIS的AOD。误差分析表明,地表反射率估计的偏差是两种算法的主要误差源。DT算法的云筛选方案比DB算法更有效。在这两种算法的质量控制过程中都应该考虑云的邻近效应。敏感性试验表明,在重庆这样地形复杂的地区,卫星产品验证中的配置方法应根据当地情况慎重选择。将MODIS产品的月平均AOD与太阳光度观测值进行比较,结果表明,Terra MODIS AOD产品可以有效地反映夏秋两季的平均状况,而Aqua MODIS产品的月平均AOD在重庆地区是有限的。
The Moderate Resolution Imaging Spectroradiometer (MODIS) Collection 6 (C6) aerosol optical depth (AOD) products from the 10/3 km Dark Target (DT) and Deep Blue (DB) algorithms are firstly evaluated using ground observed AODs by the sun photometer in Chongqing, a mountainous mega-city in southwest China. The validation results show that MODIS AODs from 10/3 km DT algorithm are comparable with those of the sun photometer, although there are slight overestimations. However, the DB algorithm substantially underestimates MODIS AODs when comparing with those of the sun photometer. Error analyses imply that the bias of surface reflectance estimation is the main error source for both algorithms. The cloud screening scheme of the DT algorithm is more effective than the DB algorithm. The cloud vicinity effect should be considered in the quality control processes for both of the algorithms. A sensitivity test suggests that in complex terrain area, like Chongqing, the collocation method in the validation of satellite products should be carefully selected according to local circumstances. When comparing the monthly mean AODs of MODIS products with sun photometer observations, it shows that the Terra MODIS AOD products are valid to represent the mean statuses in summer and autumn, but the monthly mean of Aqua MODIS AODs are limited in Chongqing.
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