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High-resolution mapping of SO2 using airborne observations from the GeoTASO instrument during the KORUS-AQ field study: PCA-based vertical column retrievals

Title
High-resolution mapping of SO2 using airborne observations from the GeoTASO instrument during the KORUS-AQ field study: PCA-based vertical column retrievals
Authors
Chong, HeesungLee, SeoyoungKim, JhoonJeong, UkkyoLi, CanKrotkov, Nickolay A.Nowlan, Caroline R.Al-Saadi, Jassim A.Janz, Scott J.Kowalewski, Matthew G.Ahn, Myoung-HwanKang, MinaJoiner, JoannaHaffner, David P.Hu, LuCastellanos, PatriciaHuey, L. GregoryChoi, MyungjeSong, Chul H.Han, Kyung ManKoo, Ja-Ho
Ewha Authors
안명환
SCOPUS Author ID
안명환scopus
Issue Date
2020
Journal Title
REMOTE SENSING OF ENVIRONMENT
ISSN
0034-4257JCR Link

1879-0704JCR Link
Citation
REMOTE SENSING OF ENVIRONMENT vol. 241
Keywords
SO2GeoTASOAirborne remote sensingKORUS-AQPCA techniqueGEMS
Publisher
ELSEVIER SCIENCE INC
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
The Geostationary Trace gas and Aerosol Sensor Optimization (GeoTASO) instrument is an airborne hyper-spectral spectrometer measuring backscattered solar radiation in the ultraviolet (290-400 nm) and visible (415-695 nm) wavelength regions. This paper presents high-resolution sulfur dioxide (SO2) maps over the Korean Peninsula, produced by SO2 retrievals from GeoTASO measurements during the Korea-United States Air Quality Field Study (KORUS-AQ) from May to June 2016. The highly sensitive GeoTASO instrument with a spatial resolution of similar to 250 m x 250 m can detect point emission sources of SO2 within its fields of view, even without merging multiple overlapping observations. To retrieve SO2 vertical columns from the GeoTASO measurements, we apply an algorithm based on principal component analysis (PCA), which is effective in suppressing noise and biases in SO2 retrievals. The retrievals successfully capture SO2 plumes and various point sources such as power plants, a petrochemical complex, and a steel mill, located in South Chungcheong Province, some of which are not detected by a ground-based in situ measurement network. Spatial distributions of SO2 from GeoTASO observations in source areas are consistent with those from the Stack Tele-Monitoring System reports and airborne in situ SO2 measurements. Comparisons of SO2 retrievals from GeoTASO and existing satellite sensors demonstrate the significance of high-resolution SO2 observations, by indicating that GeoTASO detects small SO2 emission sources that are not precisely resolved by single overpasses of satellites. To assess future geostationary SO2 observations having a higher spatial resolution, we upscale the GeoTASO SO2 retrievals to a spatial resolution of the Geostationary Environment Monitoring Spectrometer (GEMS). Since the upscaled GeoTASO retrievals also detect SO2 plumes clearly, we expect from GEMS to identify even small SO2 emission sources over Asia.
DOI
10.1016/j.rse.2020.111725
Appears in Collections:
엘텍공과대학 > 기후·에너지시스템공학전공 > Journal papers
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