High-resolution mapping of SO2 using airborne observations from the GeoTASO instrument during the KORUS-AQ field study: PCA-based vertical column retrievals
- 주제(키워드) SO2 , GeoTASO , Airborne remote sensing , KORUS-AQ , PCA technique , GEMS
- 주제(기타) Environmental Sciences
- 주제(기타) Remote Sensing
- 주제(기타) Imaging Science & Photographic Technology
- 설명문(일반) [Chong, Heesung; Lee, Seoyoung; Kim, Jhoon; Choi, Myungje; Koo, Ja-Ho] Yonsei Univ, Dept Atmospher Sci, Seoul 03722, South Korea; [Jeong, Ukkyo; Li, Can] Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20740 USA; [Jeong, Ukkyo; Li, Can; Krotkov, Nickolay A.; Janz, Scott J.; Kowalewski, Matthew G.; Joiner, Joanna; Haffner, David P.; Castellanos, Patricia] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA; [Nowlan, Caroline R.] Harvard Smithsonian Ctr Astrophys, Atom & Mol Phys Div, 60 Garden St, Cambridge, MA 02138 USA; [Al-Saadi, Jassim A.] NASA, Langley Res Ctr, Hampton, VA 23666 USA; [Kowalewski, Matthew G.] Univ Space Res Assoc, Goddard Earth Sci Technol & Res, Columbia, MD 21046 USA; [Ahn, Myoung-Hwan; Kang, Mina] Ewha Womans Univ, Dept Atmospher Sci & Engn, Seoul 03760, South Korea; [Hu, Lu] Univ Montana, Dept Chem & Biochem, Missoula, MT 59812 USA; [Huey, L. Gregory] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30318 USA; [Song, Chul H.; Han, Kyung Man] Gwangju Inst Sci & Technol, Sch Earth Sci & Environm Engn, Gwangju 61005, South Korea; [Choi, Myungje] NASA, Jet Prop Lab, Pasadena, CA 91109 USA
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- 발행기관 ELSEVIER SCIENCE INC
- 발행년도 2020
- URI http://www.dcollection.net/handler/ewha/000000168671
- 본문언어 영어
- Published As https://dx.doi.org/10.1016/j.rse.2020.111725
초록/요약
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.
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