Articles | Volume 19, issue 20
https://doi.org/10.5194/amt-19-6805-2026
https://doi.org/10.5194/amt-19-6805-2026
Research article
 | 
28 Oct 2026
Research article |  | 28 Oct 2026

A blue-band surface residual correction method for land aerosol optical depth retrieval from DQ-1 WSI

Jingxuan Zhao, Yujing Wang, Hui Chen, Mengjie Zhang, Lili Wang, Xingchuan Yang, Shuo Dong, Wenji Zhao, and Pengfei Ma

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Short summary
Satellite estimates of airborne particles can be inaccurate when light reflected by land is poorly estimated. We developed a method for China's DaQi-1 satellite that uses machine learning to correct this land signal while retaining a physics-based calculation. Comparisons with ground observations showed reduced errors in spring and autumn–winter. The method also reduced errors the following spring without retraining, suggesting more reliable monitoring over complex land surfaces.
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