Comparison of AOD from CALIPSO, MODIS, and Sun Photometer under Different Conditions over Central China.
Comparison of AOD from CALIPSO, MODIS, and Sun Photometer under Different Conditions over Central China.
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DOI：
10.1038/s41598-018-28417-7
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发表时间：
2018-07-03
影响因子：
4.6
通讯作者：
Shi Y
中科院分区：
文献类型：
--
作者：
Liu B;Ma Y;Gong W;Zhang M;Wang W;Shi Y
云-气溶胶激光雷达和红外探路卫星观测（CALIPSO）提供了关于整个地球仪的气溶胶光学特性的三维信息。然而，CALIPSO气溶胶光学厚度（AOD）产品在不同空气质量条件下的性能仍然不清楚。在这项研究中，三年的CALIPSO 2级AOD数据（2013年11月至2017年12月）被用来与中分辨率成像光谱仪（MODIS）2级柱状AOD产品和地基太阳光度计测量同期进行比较。为探讨空气质量对CALIPSO反演的AOD的影响，在武汉和登封两个地区，对不同空气质量条件下的CALIPSO、MODIS和太阳光度计反演的AOD进行了对比分析。在清洁、中度和污染天气下，CALIPSO和太阳光度计的平均绝对偏差分别为0.22 ± 0.21、0.11 ± 0.07和0.14 ± 0.13。结果表明，CALIPSO AOD在中度污染和重度污染天气下更可靠。CALIPSO与太阳光度计的AOD偏差秋季最大（0.23 ± 0.21），冬季最小（0.13 ± 0.12）。结果表明，CALIPSO AOD产品更适用于气溶胶浓度高的地区和季节。
Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) provides three-dimensional information on aerosol optical properties across the globe. However, the performance of CALIPSO aerosol optical depth (AOD) products under different air quality conditions remains unclear. In this research, three years of CALIPSO level 2 AOD data (November 2013 to December 2017) were employed to compare with the Moderate Resolution Imaging Spectroradiometer (MODIS) level 2 columnar AOD products and ground-based sun photometer measurements for the same time period. To investigate the effect of air quality on AODs retrieved from CALIPSO, the AODs obtained from CALIPSO, MODIS, and sun photometer were inter-compared under different air quality conditions over Wuhan and Dengfeng. The average absolute bias of AOD between CALIPSO and sun photometer was 0.22 ± 0.21, 0.11 ± 0.07, and 0.14 ± 0.13 under clean, moderate, and polluted weather, respectively. The result indicates that the CALIPSO AOD were more reliable under moderate and polluted days. Moreover, the deviation of AOD between CALIPSO and sun photometer was largest (0.23 ± 0.21) in the autumn season, and lowest (0.13 ± 0.12) in the winter season. The results show that CALIPSO AOD products were more applicable to regions and seasons with high aerosol concentrations.
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