Evaluation and analysis of long-term MODIS MAIAC aerosol products in China

NASA has released the latest Moderate Resolution Imaging Spectroradiometer (MODIS) Multi-Angle Implementation of Atmospheric Correction (MAIAC) Collection 6 (C6) and Collection 6.1 (C6.1) aerosol optical depth (AOD) products with 1 km spatial resolution. This study validated and compared C6 and C6.1...

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Bibliographic Details
Published in:The Science of the total environment 2024-10, Vol.948, p.174983, Article 174983
Main Authors: Huang, Ge, Su, Xin, Wang, Lunche, Wang, Yi, Cao, Mengdan, Wang, Lin, Ma, Xiaoyu, Zhao, Yueji, Yang, Leiku
Format: Article
Language:English
Subjects:
Accuracy evaluation
Aerosol optical depth
MAIAC
MODIS
Satellite remote sensing
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Summary:NASA has released the latest Moderate Resolution Imaging Spectroradiometer (MODIS) Multi-Angle Implementation of Atmospheric Correction (MAIAC) Collection 6 (C6) and Collection 6.1 (C6.1) aerosol optical depth (AOD) products with 1 km spatial resolution. This study validated and compared C6 and C6.1 MAIAC AOD products with AERONET observations in terms of accuracy and stability, and analyzed the spatiotemporal characteristics of AOD at different scales in China. The results show that the overall accuracy of MAIAC products is good, with correlation coefficient (R) > 0.9, mean bias (BIAS)  68 %. However, after the algorithm update, the accuracy of Terra MAIAC aerosol products C6.1 has significantly decreased. The accuracy of the products varies with the region. The accuracy of C6.1 in North China, Central East China, and West China, is comparable to or even exceeds that of C6, but performs poorly in South China. In addition, the stability of the updated C6.1 MAIAC aerosol products has not seen significantly improvement. The metrics of no product can all meet the stability goals of the Global Climate Observing System (GCOS, 0.02 per decade) in China. C6.1 improves the retrieval frequency in many regions and temporarily solves the problem of AOD discontinuity at the boundaries of different aerosol models in C6, but there are some fixed climatological AOD blocks (AOD = 0.014) in the eastern Tibetan Plateau region. Both C6 and C6.1 can capture similar annual variation characteristics of AOD to those observed at the AERONET sites. The study provides possible references for improving the MAIAC algorithm and building long-term stable aerosol records. [Display omitted] •The overall accuracy of C6.1 MAIAC products is comparable to C6 in China.•None of the four MAIAC products achieved stability goal of GCOS in China.•The C6.1 MAIAC has resolved the AOD boundary issue present in C6.
ISSN:0048-9697
1879-1026
1879-1026
DOI:10.1016/j.scitotenv.2024.174983