Global Significant Changes in Formaldehyde (HCHO) Columns Observed From Space at the Early Stage of the COVID-19 Pandemic
| dc.contributor.author | Sun, W. | |
| dc.contributor.author | Zhu, L. | |
| dc.contributor.author | De Smedt, I. | |
| dc.contributor.author | Bai, B. | |
| dc.contributor.author | Pu, D. | |
| dc.contributor.author | Chen, Y. | |
| dc.contributor.author | Shu, L. | |
| dc.contributor.author | Wang, D. | |
| dc.contributor.author | Fu, T.-M. | |
| dc.contributor.author | Wang, X. | |
| dc.contributor.author | Yang, X. | |
| dc.date | 2021 | |
| dc.date.accessioned | 2021-03-08T11:13:11Z | |
| dc.date.available | 2021-03-08T11:13:11Z | |
| dc.identifier.uri | https://orfeo.belnet.be/handle/internal/7732 | |
| dc.description | Abstract 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 NOx 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 NOx emission decreases in a NOx-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. | |
| dc.language | eng | |
| dc.title | Global Significant Changes in Formaldehyde (HCHO) Columns Observed From Space at the Early Stage of the COVID-19 Pandemic | |
| dc.type | Article | |
| dc.subject.frascati | Earth and related Environmental sciences | |
| dc.audience | Scientific | |
| dc.subject.free | COVID-19 | |
| dc.subject.free | HCHO | |
| dc.subject.free | NMVOCs | |
| dc.subject.free | TROPOMI | |
| dc.source.title | Geophysical Research Letters | |
| dc.source.volume | 48 | |
| dc.source.issue | 4 | |
| dc.source.page | 2e020GL091265 | |
| Orfeo.peerreviewed | Yes | |
| dc.identifier.doi | 10.1029/2020GL091265 |
