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Distinct Regimes of O 3 Response to COVID-19 Lockdown in China.
- Source :
- Atmosphere; Feb2021, Vol. 12 Issue 2, p184, 1p
- Publication Year :
- 2021
-
Abstract
- Restrictions on human activities remarkably reduced emissions of air pollutants in China during the COVID-19 lockdown periods. However, distinct responses of O<subscript>3</subscript> concentrations were observed across China. In the Beijing–Tianjin–Hebei (BTH) and Yangtze River Delta (YRD) regions, O<subscript>3</subscript> concentrations were enhanced by 90.21 and 71.79% from pre-lockdown to lockdown periods in 2020, significantly greater than the equivalent concentrations for the same periods over 2015–2019 (69.99 and 43.62%, p < 0.001). In contrast, a decline was detected (−1.1%) in the Pearl River Delta (PRD) region. To better understand the underlying causes for these inconsistent responses across China, we adopted the least absolute shrinkage and selection operator (Lasso) and ordinary linear squares (OLS) methods in this study. Statistical analysis indicated that a sharp decline in nitrogen dioxide (NO<subscript>2</subscript>) was the major driver of enhanced O<subscript>3</subscript> in the BTH region as it is a NO<subscript>x</subscript>-saturated region. In the YRD region, season-shift induced changes in the temperature/shortwave radiative flux, while lockdown induced declines in NO<subscript>2</subscript>, attributable to the rise in O<subscript>3</subscript>. In the PRD region, the slight drop in O<subscript>3</subscript> is attributed to the decreased intensity of radiation. The distinct regimes of the O<subscript>3</subscript> response to the COVID-19 lockdown in China offer important insights into different O<subscript>3</subscript> control strategies across China. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734433
- Volume :
- 12
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Atmosphere
- Publication Type :
- Academic Journal
- Accession number :
- 149095248
- Full Text :
- https://doi.org/10.3390/atmos12020184