New Era of Air Quality Monitoring from Space: Geostationary Environment Monitoring Spectrometer (GEMS)

The Geostationary Environment Monitoring Spectrometer (GEMS) is scheduled for launch in February 2020 to monitor air quality (AQ) at an unprecedented spatial and temporal resolution from a geostationary Earth orbit (GEO) for the first time. With the development of UV–visible spectrometers at sub-nm spectral resolution and sophisticated retrieval algorithms, estimates of the column amounts of atmospheric pollutants (O3, NO2, SO2, HCHO, CHOCHO, and aerosols) can be obtained. To date, all the UV–visible satellite missions monitoring air quality have been in low Earth orbit (LEO), allowing one to two observations per day. With UV–visible instruments on GEO platforms, the diurnal variations of these pollutants can now be determined. Details of the GEMS mission are presented, including instrumentation, scientific algorithms, predicted performance, and applications for air quality forecasts through data assimilation. GEMS will be on board the Geostationary Korea Multi-Purpose Satellite 2 (GEO-KOMPSAT-2) satellite series, which also hosts the Advanced Meteorological Imager (AMI) and Geostationary Ocean Color Imager 2 (GOCI-2). These three instruments will provide synergistic science products to better understand air quality, meteorology, the long-range transport of air pollutants, emission source distributions, and chemical processes. Faster sampling rates at higher spatial resolution will increase the probability of finding cloud-free pixels, leading to more observations of aerosols and trace gases than is possible from LEO. GEMS will be joined by NASA’s Tropospheric Emissions: Monitoring of Pollution (TEMPO) and ESA’s Sentinel-4 to form a GEO AQ satellite constellation in early 2020s, coordinated by the Committee on Earth Observation Satellites (CEOS).

Alexis K.H. Lau | Glen Jaross | Jihyo Chong | Pepijn Veefkind | Yugo Kanaya | Jay R. Herman | Myoung-Hwan Ahn | Sachiko Hayashida | Jung-Hun Woo | David P. Edwards | Sujung Go | Sang Seo Park | Ukkyo Jeong | Seon Ki Park | Berit Ahlers | Thomas P. Kurosu | Pawan K. Bhartia | Kelly Chance | Gregory R. Carmichael | Hyunkee Hong | Dai Ho Ko | Hana Lee | Robert J. Swap | Myungje Choi | Pieternel F. Levelt | Yasko Kasai | Ben Veihelmann | Jongmin Yoon | Marcel Dobber | Michael J. Newchurch | Mijin Kim | Hyeong-Ahn Kwon | J. A. Al-Saadi | Omar Torres | D. K. Nicks | James H. Crawford | Hitoshi Irie | Hanlim Lee | Myeong-Jae Jeong | B. L. Lefer | Heesung Chong | Cheng Liu | J. H. Kim | Xiong Liu | Sang Woo Kim | Juseon Bak | Ja Ho Koo | Jung-Moon Yoo | Junsung Park | Rokjin J. Park | Seunghoon Lee | P. Levelt | Xiong Liu | K. Chance | G. Carmichael | A. Lau | M. Newchurch | P. Bhartia | J. Herman | C. T. McElroy | D. Edwards | O. Torres | Jintai Lin | Sang-Woo Kim | Y. Kasai | R. Park | B. Veihelmann | P. Veefkind | J. Al-Saadi | Y. J. Kim | G. Jaross | Kwonho Lee | Jhoon Kim | C. Song | M. Jeong | Mijin Kim | Yunsoo Choi | J. Crawford | R. Swap | Jung-Moon Yoo | T. Kurosu | J. Woo | S. Hayashida | S. Park | Yong-Sang Choi | M. Kang | M. Dobber | B. Lefer | H. Irie | J. Al-Saadi | Y. Kanaya | G. G. Abad | C. Miller | Hanlim Lee | Myungje Choi | Sang-Kyun Kim | B. Ahlers | A. Cho | Si‐Wan Kim | M. Ahn | D. Nicks | U. Jeong | David Haffner | Gonzalo González Abad | Kyunghwa Lee | K. Han | Ebony Lee | H. Kwon | D. Haffner | J. Kim | K. M. Han | J. H. Kim | K. Baek | H. Hong | Kyung-Jung Moon | C. Thomas McElroy | Chul H. Song | Jhoon Kim | Yong-Sang Choi | Kwon-Ho Lee | Kwang-Mog Lee | Chang-Keun Song | Sang Woo Kim | Young-Joon Kim | Si-Wan Kim | Christopher Chan Miller | Won Jun Choi | Ara Cho | Sang-Kyun Kim | Kyunghwa Lee | Seoyoung Lee | Mina Kang | Mijin Eo | Kanghyun Baek | Jiwon Yang | Bo-Ram Kim | Hee-Woo Shin | Haklim Choi | Ebony Lee | Yesol Cha | Jintai Lin | Yunsoo Choi | J. Bak | H. Chong | Seoyoung Lee | Ja-Ho Koo | H. Shin | D. Haffner | K. Moon | J. Chong | W. Choi | S. Go | Kwang-Mog Lee | Junsung Park | Young‐joon Kim | Sang-Seo Park | W. Choi | D. Ko | Mijin Eo | J. Yoon | Haklim Choi | Chang‐Keun Song | Christopher E. Chan Miller | Seunghoon Lee | Hana Lee | Jiwon Yang | Bo-Ram Kim | Y. Cha | Cheng Liu | Seung Hoon Lee | Hee-Woo Shin | Kyunghwa Lee

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