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Global Significant Changes in Formaldehyde (HCHO) Columns Observed From Space at the Early Stage of the COVID-19 Pandemic.
Sun, Wenfu; Zhu, Lei; De Smedt, Isabelle; Bai, Bin; Pu, Dongchuan; Chen, Yuyang; Shu, Lei; Wang, Dakang; Fu, Tzung-May; Wang, Xiaofei; Yang, Xin.
Afiliación
  • Sun W; School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China.
  • Zhu L; School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China.
  • De Smedt I; Division of Atmospheric Composition Royal Belgian Institute for Space Aeronomy (BIRA-IASB) Brussels Belgium.
  • Bai B; School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China.
  • Pu D; School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China.
  • Chen Y; School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China.
  • Shu L; School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China.
  • Wang D; School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China.
  • Fu TM; School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China.
  • Wang X; Department of Environmental Science and Engineering Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Fudan University Shanghai China.
  • Yang X; School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen China.
Geophys Res Lett ; 48(4): 2e020GL091265, 2021 Feb 28.
Article en En | MEDLINE | ID: mdl-33785972
Satellite HCHO data are widely used as a reliable proxy of non-methane volatile organic compounds (NMVOCs) to constrain underlying emissions and chemistry. Here, we examine global significant changes in HCHO columns at the early stage of the COVID-19 pandemic (January-April 2020) compared with the same period in 2019 with observations from the TROPOspheric Monitoring Instrument (TROPOMI). HCHO columns decline (11.0%) in the Northern China Plain (NCP) because of a combination of meteorological impacts, lower HCHO yields as NO x emission plunges (by 36.0%), and reduced NMVOC emissions (by 15.0%) resulting from the lockdown. HCHO columns change near Beijing (+8.4%) due mainly to elevated hydroxyl radical as NO x emission decreases in a NO x -saturated regime. HCHO columns change in Australia (+17.5%), Northeastern Myanmar of Southeast Asia (+14.9%), Central Africa (+7.8%), and Central America (+18.9%), consistent with fire activities. Our work also points to other changes related to temperature and meteorological variations.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Geophys Res Lett Año: 2021 Tipo del documento: Article Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Geophys Res Lett Año: 2021 Tipo del documento: Article Pais de publicación: Estados Unidos