Puzzling Haze Events in China During the Coronavirus (COVID-19) Shutdown
©2020. American Geophysical Union. All Rights Reserved.
| Veröffentlicht in: | Geophysical research letters. - 1984. - 47(2020), 12 vom: 28. Juni, Seite e2020GL088533 |
|---|---|
| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2020
|
| Zugriff auf das übergeordnete Werk: | Geophysical research letters |
| Schlagworte: | Journal Article COVID‐19 emission reduction fine particle haze novel coronavirus |
| Zusammenfassung: | ©2020. American Geophysical Union. All Rights Reserved. It is a puzzle as to why more severe haze formed during the New Year Holiday in 2020 (NYH-20), when China was in an unprecedented state of shutdown to contain the coronavirus (COVID-19) outbreak, than in 2019 (NYH-19). We performed a comprehensive measurement and modeling analysis of the aerosol chemistry and physics at multiple sites in China (mainly in Shanghai) before, during, and after NYH-19 and NYH-20. Much higher secondary aerosol fraction in PM2.5 were observed during NYH-20 (73%) than during NYH-19 (59%). During NYH-20, PM2.5 levels correlated significantly with the oxidation ratio of nitrogen (r 2 = 0.77, p < 0.01), and aged particles from northern China were found to impede atmospheric new particle formation and growth in Shanghai. A markedly enhanced efficiency of nitrate aerosol formation was observed along the transport pathways during NYH-20, despite the overall low atmospheric NO2 levels |
|---|---|
| Beschreibung: | Date Revised 16.07.2022 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 0094-8276 |
| DOI: | 10.1029/2020GL088533 |