Quantifying aerosol absorption at ultraviolet (UV) wavelengths is important for monitoring air pollution and aerosol amounts using current (e.g., Aura/OMI) and future (e.g., TROPOMI, TEMPO, GEMS, and Sentinel-4) satellite measurements. Measurements of column average atmospheric aerosol single scattering albedo (SSA) are performed on the ground by the NASA AERONET in the visible (VIS) and near-infrared (NIR) wavelengths and in the UV-VIS-NIR by the SKYNET networks. Previous comparison studies have focused on VIS and NIR wavelengths due to the lack of co-incident measurements of aerosol and gaseous absorption properties in the UV. This study compares the SKYNET-retrieved SSA in the UV with the SSA derived from a combination of AERONET, MFRSR, and Pandora (AMP) retrievals in Seoul, South Korea, in spring and summer 2016. The results show that the spectrally invariant surface albedo assumed in the SKYNET SSA retrievals leads to underestimated SSA compared to AMP values at near UV wavelengths. Re-processed SKYNET inversions using spectrally varying surface albedo, consistent with the AERONET retrieval improve agreement with AMP SSA. The combined AMP inversions allow for separating aerosol and gaseous (NO2 and O3) absorption and provide aerosol retrievals from the shortest UVB (305 nm) through VIS to NIR wavelengths (870 nm).
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Acknowledgements. Jungbin Mok was supported by the University of Maryland/ESSIC–NASA cooperative agreement and a NASA grant (NNX16AN61G). Jhoon Kim, Ja-Ho Koo, and Sujung Go were supported by the Korea Ministry of Environment (MOE) under the grant: “Public Technology Program based on Environmental Policy (2017000160001)”. The authors acknowledge support from NASA Earth Science Division, Radiation Sciences and Atmospheric Composition programs and the AERONET project at GSFC. The authors also thank the AERONET team, Charles M. Wilson from the NOAA Central UV Calibration Facility (CUCF), plus George Janson, and Becky Olson from the USDA UV-B monitoring and Research Program (UVMRP).
All Science Journal Classification (ASJC) codes
- Atmospheric Science