Journal
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
Volume 19, Issue -, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LGRS.2021.3077189
Keywords
Aerosols; COVID-19; Uncertainty; MODIS; Loading; Adaptive optics; Atmospheric measurements; Aerosol optical depth (AOD); AErosol RObotic NETwork (AERONET); COVID-19; dark target (DT); deep blue (DB); lockdown; multiangle implementation of atmospheric correction (MAIAC)
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Funding
- National Key Research and Development Program of China [2016YFC1400901]
- Jiangsu Provincial Department of Education for the Special Project of Jiangsu Distinguished Professor [R2018T22]
- Deanship of Scientific Research at King Khalid University [RGP.2/173/42]
- Startup Foundation for Introduction Talent of the Nanjing University of Information Science and Technology (NUIST) [2017r107]
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This letter reports uncertainties in Aqua-MODIS during the COVID-19 lockdown period. The MAIAC algorithm performed better than the DT and DB algorithms. All MODIS algorithms overestimated the AOD during lockdown and showed higher positive bias.
This letter reports uncertainties in the Aqua-Moderate Resolution Imaging Spectroradiometer (MODIS) Level 2 dark target (DT), deep blue (DB), and multiangle implementation of atmospheric correction (MAIAC) aerosol optical depth (AOD) during the COVID-19 lockdown period (February-May 2020) compared to the pre-COVID-19 period (February-May 2019). Validation of AOD retrievals was conducted against AErosol RObotic NETwork (AERONET) Version 3 Level 1.5 AOD data obtained from three sites located in urban (Beijing_CAMS and Beijing_RADI) and suburban (XiangHe) areas of China. The results show the poor performance of the DT and DB algorithms compared to the MAIAC algorithm, which performed better during the lockdown period. Overall, all MODIS algorithms overestimated the AOD and showed higher positive bias under high aerosol loading conditions during lockdown than during prelockdown. This is mainly attributed to the overestimation of the aerosol single-scattering albedo (SSA), which was found higher during lockdown than during the same period in 2019.
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