Markedly Enhanced Levels of Peroxyacetyl Nitrate (PAN) During COVID‐19 in Beijing
| Autor: | Ke Li, Fan Dong, Yulu Qiu, Yingxiao Tang, Zhiqiang Ma, Hong Liao, Weili Lin |
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| Rok vydání: | 2020 |
| Předmět: |
Peroxyacetyl nitrate
Ozone 010504 meteorology & atmospheric sciences Coronavirus disease 2019 (COVID-19) Context (language use) 010502 geochemistry & geophysics 01 natural sciences Photochemical pollution chemistry.chemical_compound Geophysics Beijing chemistry Environmental chemistry General Earth and Planetary Sciences Environmental science NOx Historical record 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Research Letters. 47 |
| ISSN: | 1944-8007 0094-8276 |
| Popis: | High levels of secondary air pollutants during COVID-19 in China have aroused great concern In Beijing, measured daily mean peroxyacetyl nitrate (PAN) concentrations reached 4 ppb over the lockdown period (01/24?02/15), whose averages were 2?3 times that before lockdown (01/01?01/23) The lockdown PAN levels also reached a high historical record based on our long-term measurements (2016?2019) Unlike ozone and PM2 5, PAN formation depends on less complex photochemistry between NOx and volatile organic compounds (VOCs), providing a novel approach to investigate the wintertime photochemistry during COVID-19 The GEOS-Chem simulations suggest a markedly enhanced photochemistry by a factor of 2 during the lockdown Change of meteorology featuring with anomalous wind convergence under higher temperatures is the main reason for enhanced photochemical formation of PAN, while chemically nonlinear feedbacks also play a role Our results suggest implementing targeted VOC emission controls in the context of increasing photochemical pollution over this complex polluted region |
| Databáze: | OpenAIRE |
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