Validation of GEMS operational v2.0 total column NO2 and HCHO during the GMAP/SIJAQ campaign

作者：Kangho Bae, Chang‐Keun Song, Michel Van Roozendaël, Andreas Richter, Thomas Wagner, Alexis Merlaud, Gaïa Pinardi, Martina M. Friedrich, Caroline Fayt, Ermioni Dimitropoulou, Kezia Lange, Tim Bösch, Bianca Zilker, Miriam Latsch, Lisa K. Behrens, Steffen Ziegler, Simona Ripperger-Lukošiūnaitė, Leon Kuhn, Bianca Lauster, Lucas Reischmann, Katharina Uhlmannsiek, Alexander Cede, Martin Tiefengraber, Manuel Gebetsberger, Rokjin J. Park, Hanlim Lee, Hyunkee Hong, Lim‐Seok Chang, Kwonho Jeon · 发表于：The Science of The Total Environment · 年份：2025 · DOI：10.1016/j.scitotenv.2025.179190 · 被引用次数：13 · 研究领域：Atmospheric Ozone and Climate、Atmospheric chemistry and aerosols、Atmospheric and Environmental Gas Dynamics

The Geostationary Environmental Monitoring Spectrometer (GEMS), the first geostationary air quality instrument, onboard the GEO-KOMPSAT-2B (GK2B) satellite, produces hourly observations over Asia with 3.5 km × 8 km spatial resolution. To evaluate the GEMS L2 products, the National Institute of Environmental Research (NIER) organized the GEMS Map of Air Pollutants 2021 (GMAP2021) and the Satellite Integrated Joint monitoring of Air Quality 2022 (SIJAQ2022) campaigns during October 2021 to November 2021 and from June 2022 to July 2022, respectively. While GMAP2021 mainly targeted the SMA (Seoul Metropolitan Area), the SIJAQ2022 campaign extended to the southeastern area of South Korea. In this study, a comparison between Pandora and Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) products and an evaluation of the GEMS operational v2.0 total column NO 2 and HCHO products are conducted. A comparative analysis between the Pandora (P189) and the IUP Bremen MAX-DOAS instrument at the Incheon NIER-ESC site was performed to analyze discrepancies between the retrieval processors (Pandora: PGN official processor, MAX-DOAS: MMF in FRM 4 DOAS framework). Aligning the viewing directions of both Pandora and MAX-DOAS leads to a significant increase in the slope and correlation coefficient from 0.87 to 0.96 and from 0.86 to 0.96, respectively, in the case of NO 2 tropospheric columns. Similarly, for HCHO tropospheric columns, slope and correlation coefficient change from 0....