Evaluating GEMS HCHO Retrievals With TROPOMI Product, Pandora Observations, and GEOS‐Chem Simulations
Abstract Satellite column formaldehyde (HCHO) is an indicator of regional volatile organic compounds (VOC) emissions as HCHO is a short‐lived intermediate oxidation product. The Geostationary Environment Monitoring Spectrometer (GEMS), launched in 2020, is the first geostationary satellite to monito...
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American Geophysical Union (AGU)
2025-01-01
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| Series: | Earth and Space Science |
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| Online Access: | https://doi.org/10.1029/2024EA003894 |
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| author | Weitao Fu Lei Zhu Hyeong‐Ahn Kwon Rokjin J. Park Gitaek T. Lee Isabelle DeSmedt Song Liu Xicheng Li Yuyang Chen Dongchuan Pu Juan Li Xiaoxing Zuo Peng Zhang Yali Li Zhuoxian Yan Xue Zhang Jiaming Zhang Xingyi Wu Huizhong Shen Jianhuai Ye Chen Wang Tzung‐May Fu Xin Yang |
| author_facet | Weitao Fu Lei Zhu Hyeong‐Ahn Kwon Rokjin J. Park Gitaek T. Lee Isabelle DeSmedt Song Liu Xicheng Li Yuyang Chen Dongchuan Pu Juan Li Xiaoxing Zuo Peng Zhang Yali Li Zhuoxian Yan Xue Zhang Jiaming Zhang Xingyi Wu Huizhong Shen Jianhuai Ye Chen Wang Tzung‐May Fu Xin Yang |
| author_sort | Weitao Fu |
| collection | DOAJ |
| description | Abstract Satellite column formaldehyde (HCHO) is an indicator of regional volatile organic compounds (VOC) emissions as HCHO is a short‐lived intermediate oxidation product. The Geostationary Environment Monitoring Spectrometer (GEMS), launched in 2020, is the first geostationary satellite to monitor hourly HCHO. GEMS offers unprecedented potential to reveal the diurnal variations of VOC emissions in Asia. Here, we present the first study to evaluate year‐round GEMS HCHO retrievals using TROPOMI satellite and ground‐based Pandora spectrometers. Our study shows that GEMS HCHO aligns with TROPOMI (r = 0.59–0.85; differences within 20% for most areas). Moreover, GEMS captures monthly and diurnal HCHO variations observed by Pandora spectrometers across Asia with differences overall within 15% (r ∼ 0.85). Diurnally, we find strong HCHO variations over urban areas but not in forests. During the fire season of mainland Southeast Asia, GEMS HCHO increases in the afternoon, in line with diurnal emission estimates from the Global Fire Emissions Database Version 4 with small fires (GFED4s) and GEOS‐Chem simulations. GEMS also captures the spatial patterns of fire emissions in GFED4s. GEMS HCHO shows negative bias when observing with a high (>60°) viewing zenith angle (VZA) and overly relies on model correction for observations to the north of 30°N. |
| format | Article |
| id | doaj-art-a6878b2c18944d1a900bf5a971e42eef |
| institution | Kabale University |
| issn | 2333-5084 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | American Geophysical Union (AGU) |
| record_format | Article |
| series | Earth and Space Science |
| spelling | doaj-art-a6878b2c18944d1a900bf5a971e42eef2025-01-28T11:08:40ZengAmerican Geophysical Union (AGU)Earth and Space Science2333-50842025-01-01121n/an/a10.1029/2024EA003894Evaluating GEMS HCHO Retrievals With TROPOMI Product, Pandora Observations, and GEOS‐Chem SimulationsWeitao Fu0Lei Zhu1Hyeong‐Ahn Kwon2Rokjin J. Park3Gitaek T. Lee4Isabelle DeSmedt5Song Liu6Xicheng Li7Yuyang Chen8Dongchuan Pu9Juan Li10Xiaoxing Zuo11Peng Zhang12Yali Li13Zhuoxian Yan14Xue Zhang15Jiaming Zhang16Xingyi Wu17Huizhong Shen18Jianhuai Ye19Chen Wang20Tzung‐May Fu21Xin Yang22School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaDepartment of Environmental & Energy Engineering University of Suwon Hwaseong‐si Republic of KoreaSchool of Earth and Environmental Sciences Seoul National University Seoul Republic of KoreaSchool of Earth and Environmental Sciences Seoul National University Seoul Republic of KoreaRoyal Belgian Institute for Space Aeronomy (BIRA‐IASB) Brussels BelgiumSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaSchool of Environmental Science and Engineering Southern University of Science and Technology Shenzhen ChinaAbstract Satellite column formaldehyde (HCHO) is an indicator of regional volatile organic compounds (VOC) emissions as HCHO is a short‐lived intermediate oxidation product. The Geostationary Environment Monitoring Spectrometer (GEMS), launched in 2020, is the first geostationary satellite to monitor hourly HCHO. GEMS offers unprecedented potential to reveal the diurnal variations of VOC emissions in Asia. Here, we present the first study to evaluate year‐round GEMS HCHO retrievals using TROPOMI satellite and ground‐based Pandora spectrometers. Our study shows that GEMS HCHO aligns with TROPOMI (r = 0.59–0.85; differences within 20% for most areas). Moreover, GEMS captures monthly and diurnal HCHO variations observed by Pandora spectrometers across Asia with differences overall within 15% (r ∼ 0.85). Diurnally, we find strong HCHO variations over urban areas but not in forests. During the fire season of mainland Southeast Asia, GEMS HCHO increases in the afternoon, in line with diurnal emission estimates from the Global Fire Emissions Database Version 4 with small fires (GFED4s) and GEOS‐Chem simulations. GEMS also captures the spatial patterns of fire emissions in GFED4s. GEMS HCHO shows negative bias when observing with a high (>60°) viewing zenith angle (VZA) and overly relies on model correction for observations to the north of 30°N.https://doi.org/10.1029/2024EA003894GEMSHCHOGEOS‐ChemvalidationTROPOMIPandora |
| spellingShingle | Weitao Fu Lei Zhu Hyeong‐Ahn Kwon Rokjin J. Park Gitaek T. Lee Isabelle DeSmedt Song Liu Xicheng Li Yuyang Chen Dongchuan Pu Juan Li Xiaoxing Zuo Peng Zhang Yali Li Zhuoxian Yan Xue Zhang Jiaming Zhang Xingyi Wu Huizhong Shen Jianhuai Ye Chen Wang Tzung‐May Fu Xin Yang Evaluating GEMS HCHO Retrievals With TROPOMI Product, Pandora Observations, and GEOS‐Chem Simulations Earth and Space Science GEMS HCHO GEOS‐Chem validation TROPOMI Pandora |
| title | Evaluating GEMS HCHO Retrievals With TROPOMI Product, Pandora Observations, and GEOS‐Chem Simulations |
| title_full | Evaluating GEMS HCHO Retrievals With TROPOMI Product, Pandora Observations, and GEOS‐Chem Simulations |
| title_fullStr | Evaluating GEMS HCHO Retrievals With TROPOMI Product, Pandora Observations, and GEOS‐Chem Simulations |
| title_full_unstemmed | Evaluating GEMS HCHO Retrievals With TROPOMI Product, Pandora Observations, and GEOS‐Chem Simulations |
| title_short | Evaluating GEMS HCHO Retrievals With TROPOMI Product, Pandora Observations, and GEOS‐Chem Simulations |
| title_sort | evaluating gems hcho retrievals with tropomi product pandora observations and geos chem simulations |
| topic | GEMS HCHO GEOS‐Chem validation TROPOMI Pandora |
| url | https://doi.org/10.1029/2024EA003894 |
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