{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T21:20:15Z","timestamp":1787001615068,"version":"build-2736575974"},"reference-count":51,"publisher":"American Geophysical Union (AGU)","issue":"4","license":[{"start":{"date-parts":[[2021,2,23]],"date-time":"2021-02-23T00:00:00Z","timestamp":1614038400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["agupubs.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Geophysical Research Letters"],"published-print":{"date-parts":[[2021,2,28]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Satellite HCHO data are widely used as a reliable proxy of non\u2010methane 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\u201019 pandemic (January\u2013April 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\n                    <jats:sub>\n                      <jats:italic>x<\/jats:italic>\n                    <\/jats:sub>\n                    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\n                    <jats:sub>\n                      <jats:italic>x<\/jats:italic>\n                    <\/jats:sub>\n                    emission decreases in a NO\n                    <jats:sub>\n                      <jats:italic>x<\/jats:italic>\n                    <\/jats:sub>\n                    \u2010saturated 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.\n                  <\/jats:p>","DOI":"10.1029\/2020gl091265","type":"journal-article","created":{"date-parts":[[2021,2,3]],"date-time":"2021-02-03T15:52:02Z","timestamp":1612367522000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":46,"title":["Global Significant Changes in Formaldehyde (HCHO) Columns Observed From Space at the Early Stage of the COVID\u201019 Pandemic"],"prefix":"10.1029","volume":"48","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6697-3812","authenticated-orcid":false,"given":"Wenfu","family":"Sun","sequence":"first","affiliation":[{"name":"School of Environmental Science and Engineering Southern University of Science and Technology  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3919-3095","authenticated-orcid":false,"given":"Lei","family":"Zhu","sequence":"additional","affiliation":[{"name":"School of Environmental Science and Engineering Southern University of Science and Technology  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3541-7725","authenticated-orcid":false,"given":"Isabelle","family":"De Smedt","sequence":"additional","affiliation":[{"name":"Division of Atmospheric Composition Royal Belgian Institute for Space Aeronomy (BIRA\u2010IASB)  Brussels Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6979-7412","authenticated-orcid":false,"given":"Bin","family":"Bai","sequence":"additional","affiliation":[{"name":"School of Environmental Science and Engineering Southern University of Science and Technology  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dongchuan","family":"Pu","sequence":"additional","affiliation":[{"name":"School of Environmental Science and Engineering Southern University of Science and Technology  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5220-0501","authenticated-orcid":false,"given":"Yuyang","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Environmental Science and Engineering Southern University of Science and Technology  Shenzhen China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4099-8958","authenticated-orcid":false,"given":"Lei","family":"Shu","sequence":"additional","affiliation":[{"name":"School of Environmental Science and Engineering Southern University of Science and Technology  Shenzhen 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Prevention Fudan University  Shanghai China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Yang","sequence":"additional","affiliation":[{"name":"School of Environmental Science and Engineering Southern University of Science and Technology  Shenzhen 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