A003-0003
First results of formaldehyde vertical columns from the Geostationary Environment Monitoring Spectrometer (GEMS) onboard a geostationary satellite over Asia

Monday, 7 December 2020
Poster
Hyeong-Ahn Kwon1, Rokjin Park2, Gonzalo Gonzalez Abad3, Jhoon Kim4, Myoung-Hwan Ahn5, Mina Kang6, Mijin Eo5, Heesung Chong4, Hyunkee Hong7 and Dongwon Lee7, (1)Seoul National University, School of Earth and Environmental Sciences, Seoul, Korea, Republic of (South), (2)Seoul National University, School of Earth and Environmental Sciences, Seoul, South Korea, (3)Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, United States, (4)Yonsei University, Department of Atmospheric Sciences, Seoul, Korea, Republic of (South), (5)Ewha Womans University, Seoul, South Korea, (6)Ewha Womans University, Seoul, Korea, Republic of (South), (7)National Institute of Environmental Research, Environmental Satellite Center, Incheon, South Korea
Abstract:
The Geostationary Environment Monitoring Spectrometer (GEMS) on a geostationary satellite was launched in February 2020. GEMS has measured air pollutants every hour in daytime over Asia with a fine spatial resolution of 3.5 x 8 km2 for aerosol and 7 x 8 km2 for gases. Here we describe the formaldehyde (HCHO) retrieval algorithm for GEMS and show the first results of HCHO vertical columns over Asia. Also, we show the diurnal variation of HCHO vertical columns from satellites for the first time. We compare HCHO vertical columns with those of GOME-2 and TROPOMI, which have different overpass times in the morning and afternoon, respectively. We discuss what components can affect HCHO vertical columns at different times through the comparison. Finally, we show possible applications of GEMS HCHO vertical columns with those from an aircraft platform. Anthropogenic volatile organic compound emissions are estimated using HCHO vertical columns from GeoTASO onboard the B200 aircraft during the KORUS-AQ campaign, and the diurnal variation of the emissions is also examined.
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