Typhoon-boosted biogenic emission aggravates cross-regional ozone pollution in China

Science Advances, Journal Year: 2022, Volume and Issue: 8(2)

Published: Jan. 14, 2022

Enhanced anthropogenic and biogenic interaction by approaching typhoons deteriorates cross-regional ozone pollution in China.

Language: Английский

---

Seasonality and reduced nitric oxide titration dominated ozone increase during COVID-19 lockdown in eastern China

npj Climate and Atmospheric Science, Journal Year: 2022, Volume and Issue: 5(1)

Published: March 28, 2022

Abstract With improving PM 2.5 air quality, the tropospheric ozone (O 3 ) has become top issue of China’s pollution control. Here, we combine comprehensive observational data analysis with models to unveil contributions different processes and precursors change O during COVID-19 lockdown in Yangtze River Delta (YRD), one most urbanized megacity regions eastern China. Despite a 44 47% reduction volatile organic compounds (VOCs) nitrogen oxides (NO x emissions, maximum daily 8-h average (MDA8) concentrations increase from 28 ppbv pre-lockdown 43 period. We reproduce this transition WRF-Chem model, which shows that ~80% MDA8 is due meteorological factors (seasonal variation radiation), ~20% emission reduction. find daytime photochemistry does not lead an but rather decrease production lockdown. However, reduced overwhelmed by weakened nitric oxide (NO) titration resulting net concentration. Although increases concentration, it leads + NO 2 suggesting atmospheric oxidation capacity on regional scale. The dominant effect demonstrates importance prioritizing VOCs reduction, especially solvent usage petrochemical industry high ratios VOCs/NO x.

Language: Английский

---

A comprehensive investigation on volatile organic compounds (VOCs) in 2018 in Beijing, China: Characteristics, sources and behaviours in response to O3 formation

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 806, P. 150247 - 150247

Published: Sept. 9, 2021

Language: Английский

---

Evaluating cost and benefit of air pollution control policies in China: A systematic review

Journal of Environmental Sciences, Journal Year: 2022, Volume and Issue: 123, P. 140 - 155

Published: March 7, 2022

Language: Английский

---

Unraveling the O3-NOX-VOCs relationships induced by anomalous ozone in industrial regions during COVID-19 in Shanghai

Atmospheric Environment, Journal Year: 2023, Volume and Issue: 308, P. 119864 - 119864

Published: May 23, 2023

Language: Английский

---

Decrease in ambient volatile organic compounds during the COVID-19 lockdown period in the Pearl River Delta region, south China

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 823, P. 153720 - 153720

Published: Feb. 8, 2022

Language: Английский

---

The Influence of Synoptic Weather Patterns on Spatiotemporal Characteristics of Ozone Pollution Across Pearl River Delta of Southern China

Journal of Geophysical Research Atmospheres, Journal Year: 2022, Volume and Issue: 127(21)

Published: Oct. 29, 2022

Abstract Tropospheric ozone (O 3 ) pollution is becoming the primary obstacle to improvement of air quality in China, especially Pearl River Delta (PRD) region. Because O episodes are closely related synoptic weather patterns (SWPs), historical (from 2006 2019) were classified according SWPs using Lamb‐Jenkinson method. Monitoring network and reanalysis data, emission inventories, satellite retrievals used investigate spatiotemporal characteristics influences pollution. It was found that easterly (P_E), anticyclone (P_A), typhoon‐related (P_NE) accounted for 75% all episodes. In PRD, formation mechanism showed clear differences under different SWPs, which affected by local emissions P_A, whereas regional transmission dominated P_E P_NE. The peak concentration strongly associated with temperature, solar radiation, shifting sea‐land breeze. A delayed shift land sea breeze caused often appear late afternoon. Finally, stepwise regression explain individual meteorological parameters contributing formation. P_NE increases temperature while P_A mainly increase overnight accumulation . This study advances our knowledge provides scientific support effective control.

Language: Английский

---

Source apportionment and ozone formation mechanism of VOCs considering photochemical loss in Guangzhou, China

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 903, P. 166191 - 166191

Published: Aug. 9, 2023

Language: Английский

---

High-resolution regional emission inventory contributes to the evaluation of policy effectiveness: a case study in Jiangsu Province, China

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(7), P. 4247 - 4269

Published: April 6, 2023

Abstract. China has been conducting a series of actions on air quality improvement for the past decades, and pollutant emissions have changing swiftly across country. Provinces are an important administrative unit management in China; thus reliable provincial-level emission inventory multiple years is essential detecting varying sources pollution evaluating effectiveness controls. In this study, we selected Jiangsu, one most developed provinces China, high-resolution nine species 2015–2019, with improved methodologies different sectors, best available facility-level information individual sources, real-world measurements. Resulting from implementation strict control measures, anthropogenic were estimated to declined 53 %, 20 7 2 10 21 16 6 18 % sulfur dioxide (SO2), nitrogen oxides (NOx), carbon monoxide (CO), non-methane volatile organic compounds (NMVOCs), ammonia (NH3), inhalable particulate matter (PM10), fine (PM2.5), black (BC), (OC) 2015 2019, respectively. Larger abatement SO2, NOx, PM2.5 was detected more region southern Jiangsu. During period 2016 ratio biogenic (BVOCs) (AVOCs) exceeded 50 month July, indicating importance summer O3 formation. Our estimates annual NMVOCs, NH3 generally smaller than national inventory, MEIC (the Multi-resolution Emission Inventory China), but larger primary particles. The discrepancies between studies resulted mainly methods estimation (e.g., procedure-based approach AVOC key industries used work) inconsistent source operation penetration removal efficiencies devices). Regarding periods, reduction SO2 found 2017 AVOCs, 2019. Among 13 major ultra-low-emission retrofit power sector contributor reduced NOx (accounting 38 43 abatement, respectively) 2015–2017, its effect became very limited afterwards as had commonly completed by 2017. Instead, extensive coal-fired boilers upgrade renovation non-electrical industry measures 2017–2019, accounting collectively 61 49 57 PM2.5, Controls industrial sectors effective two while relating other (transportation solvent replacement) become recent years. provincial demonstrated support modeling Through scenario setting modeling, worsened meteorological conditions 2019 alleviation. However, efforts controls identified largely overcome negative influence variation. changed contribute 4.3 5.5 µg m−3 concentration 2015–2017 While elevated 4.9 led 3.1 partly (not fully though) offsetting meteorology-driven growth. analysis justified validity local provided scientific basis formulate prevention policies regions worldwide.

Language: Английский

---

Effects of significant emission changes on PM2.5 chemical composition and optical properties from 2019 to 2021 in a typical industrial city of eastern China

Atmospheric Research, Journal Year: 2024, Volume and Issue: 301, P. 107287 - 107287

Published: Feb. 8, 2024

Language: Английский

---