NOx Emission Reduction and Recovery during COVID-19 in East China
| Autor: | Yuhang Wang, Haipeng Lin, Ruixiong Zhang, Tzung-May Fu, Xu Feng, Yuzhong Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Atmospheric Science
2019-20 coronavirus outbreak 010504 meteorology & atmospheric sciences Coronavirus disease 2019 (COVID-19) Pollutant emissions Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Air pollution GEOS-Chem Geos chem 010501 environmental sciences Environmental Science (miscellaneous) lcsh:QC851-999 Atmospheric sciences medicine.disease_cause 01 natural sciences Satellite retrieval medicine WRF-GC China NOx 0105 earth and related environmental sciences COVID-19 NOx emission Environmental science lcsh:Meteorology. Climatology |
| Zdroj: | Atmosphere Volume 11 Issue 4 Atmosphere, Vol 11, Iss 433, p 433 (2020) |
| ISSN: | 2073-4433 |
| DOI: | 10.3390/atmos11040433 |
| Popis: | Since its first confirmed case at the end of 2019, COVID-19 has become a global pandemic in three months with more than 1.4 million confirmed cases worldwide, as of early April 2020. Quantifying the changes of pollutant emissions due to COVID-19 and associated governmental control measures is crucial to understand its impacts on economy, air pollution, and society. We used the WRF-GC model and the tropospheric NO2 column observations retrieved by the TROPOMI instrument to derive the top-down NOx emission change estimation between the three periods: P1 (January 1st to January 22nd, 2020), P2 (January 23rd, Wuhan lockdown, to February 9th, 2020), and P3 (February 10th, back-to-work day, to March 12th, 2020). We found that NOx emissions in East China averaged during P2 decreased by 50% compared to those averaged during P1. The NOx emissions averaged during P3 increased by 26% compared to those during P2. Most provinces in East China gradually regained some of their NOx emissions after February 10, the official back-to-work day, but NOx emissions in most provinces have not yet to return to their previous levels in early January. NOx emissions in Wuhan, the first epicenter of COVID-19, had no sign of emission recovering by March 12. A few provinces, such as Zhejiang and Shanxi, have recovered fast, with their averaged NOx emissions during P3 almost back to pre-lockdown levels. |
| Databáze: | OpenAIRE |
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