Aggravated chemical production of aerosols by regional transport and basin terrain in a heavy PM2.5 pollution episode over central China

Hu, Weiyang; Zhao, Yu; Zhao, Tianliang; Bai, Yongqing; Zhao, Chun; Kong, Shaofei; Chen, Lei; Du, Qiuyan; Zheng, Huang; Lu, Wen; Liu, Weichen; Sun, Xiaoyun

doi:10.1016/j.atmosenv.2022.119489

Cited by 7 publications

(4 citation statements)

References 73 publications

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“…Factors such as topography and landforms play a role in certain regions. In China, for example, the Sichuan Basin and the Tarim Basin are affected by topography, causing the accumulation of air pollutants and hindering their dispersion, resulting in the formation of high pollution centers [47,48]. In regions like North Africa, dust storms, monsoon patterns, and atmospheric circulations contribute to elevated levels of dust aerosols and the high AOD value [49].…”

Section: Discussionmentioning

confidence: 99%

Comprehensive Assessment and Analysis of the Current Global Aerosol Optical Depth Products

Zhang,

Wang,

Huang

et al. 2024

Remote Sensing

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Aerosol Optical Depth (AOD) is one of the most important optical properties of aerosols that may affect the energy budgets of our Earth–atmosphere system significantly. Currently, while regional and even global AOD knowledge has been given by various satellites or models, these products are still fraught with uncertainties. In this study, one sophisticated satellite-derived AOD product from MODIS (MODerate resolution Imaging Spectral-radiometer) and two state-of-the-art model-based AOD products from CAMS (Copernicus Atmosphere Monitoring Service) and MERRA-2 (Modern-Era Retrospective analysis for Research and Application Version 2), based on AERONET measurements from 2000–2022, analyzed the spatial distribution characteristics of global AOD. Then using the Mann-Kendall (MK) trend test, the AOD changing trends revealed by the three products were also computed and analyzed. The accuracies of these products and the reliabilities of changing trends derived are discussed and concluded finally. Our study demonstrates that MODIS products have wider applicability, matching best with AERONET globally, while CAMS and MERRA-2 products are only reliable in North America, South America, and Europe. Through comparative analysis of the AOD trends, we found that MODIS, CAMS, and MERRA-2 AOD consistently exhibited decreasing trends in eastern Asia, Europe, and eastern North America. On the other hand, different products showed increasing trends in regions like West Asia, South Asia, and South Africa, suggesting their limited reliability. The reliability assessment shows that 41.45% of the areas have consistent trends among the three products, with approximately 3.2% showing significant and consistent results. When using site trend validation, the proportions of sites with consistent trends are highest at 64.56% and 46.84% respectively. The regions with the best reliability of global trend changes are mainly distributed in North America, Europe, Australia, eastern Asia, and Central South America. This study provides new insights for validating aerosol changes using remote sensing and has the potential to enhance future monitoring and evaluation methods of aerosol products.

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Section: Discussionmentioning

confidence: 99%

Comprehensive Assessment and Analysis of the Current Global Aerosol Optical Depth Products

Zhang,

Wang,

Huang

et al. 2024

Remote Sensing

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“…A detailed introduction to IPR was described in Gipson and Chen et al Following the definition of IPR, this method was conventionally applied to assess contributions of physical/chemical processes to concentration differences between two instantaneous time points, e.g., hourly (current hour relative to previous one) changes, 24-h (23:00 relative to 0:00) changes, and even more general changes from instantaneous time point t 1 to t n (light gray box in Figure ). ,,− ,− …”

Section: Materials and Methodsmentioning

confidence: 99%

Process-Level Quantification on Opposite PM_2.5 Changes during the COVID-19 Lockdown over the North China Plain

Chen,

Liao,

et al. 2023

Environ. Sci. Technol. Lett.

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“…Along with a fast-growing economy, China has been suffering from heavy complex air pollution, with particularly high concentrations of fine particles (PM 2.5 ) and ozone (O 3 ). , While the nationwide PM 2.5 level has declined since 2013, , current PM 2.5 concentrations in developed eastern China are still higher than the interim target 2 (25 μg m –3 ) of the World Health Organization, and the O 3 concentration keeps increasing for most of the past decade. − High PM 2.5 and O 3 concentrations pose a serious threat to human health, − ecosystems, , as well as regional and global climate. , Identification of regional and sectoral sources of PM 2.5 and O 3 is crucial for reducing air pollution and associated damages.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the unequal air quality policies for different areas and asynchronous emission control actions for various species and sectors have altered the regional and sectoral sources of PM 2.5 and O 3 for eastern China. , For example, enhanced pollution transport was estimated to play an increasingly important role on air quality for certain developed key regions, , and controls of nonelectrical industry were demonstrated to be more effective on reducing pollutant emissions than those of the power sector for more recent years . Although the sources of PM 2.5 or O 3 have been analyzed for typical pollution seasons for some developed regions, ,,− few studies have quantified the varying responses of air quality to changing precursor emissions in a comprehensive framework and from a long-term perspective. The latter are valuable for correctly understanding the effectiveness of continuous emission controls and the main anthropogenic drivers of changes in air quality.…”

Section: Introductionmentioning

confidence: 99%

Changing Responses of PM_2.5 and Ozone to Source Emissions in the Yangtze River Delta Using the Adjoint Model

Hu,

Zhao,

et al. 2023

Environ. Sci. Technol.

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China's industrial restructuring and pollution controls have altered the contributions of individual sources to varying air quality over the past decade. We used the GEOS-Chem adjoint model and investigated the changing sensitivities of PM 2.5 and ozone (O 3 ) to multiple species and sources from 2010 to 2020 in the central Yangtze River Delta (YRDC), the largest economic region in China. Controlling primary particles and SO 2 from industrial and residential sectors dominated PM 2.5 decline, and reducing CO from multiple sources and ≥C 3 alkenes from vehicles restrained O 3 . The chemical regime of O 3 formation became less VOC-limited, attributable to continuous NO X abatement for specific sources, including power plants, industrial combustion, cement production, and off-road traffic. Regional transport was found to be increasingly influential on PM 2.5 . To further improve air quality, management of agricultural activities to reduce NH 3 is essential for alleviating PM 2.5 pollution, while controlling aromatics, alkenes, and alkanes from industry and gasoline vehicles is effective for O 3 . Reducing the level of NO X from nearby industrial combustion and transportation is helpful for both species. Our findings reveal the complexity of coordinating control of PM 2.5 and O 3 pollution in a fast-developing region and support sciencebased policymaking for other regions with similar air pollution problems.

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Aggravated chemical production of aerosols by regional transport and basin terrain in a heavy PM2.5 pollution episode over central China

Cited by 7 publications

References 73 publications

Comprehensive Assessment and Analysis of the Current Global Aerosol Optical Depth Products

Comprehensive Assessment and Analysis of the Current Global Aerosol Optical Depth Products

Process-Level Quantification on Opposite PM_2.5 Changes during the COVID-19 Lockdown over the North China Plain

Changing Responses of PM_2.5 and Ozone to Source Emissions in the Yangtze River Delta Using the Adjoint Model

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Aggravated chemical production of aerosols by regional transport and basin terrain in a heavy PM2.5 pollution episode over central China

Cited by 7 publications

References 73 publications

Comprehensive Assessment and Analysis of the Current Global Aerosol Optical Depth Products

Comprehensive Assessment and Analysis of the Current Global Aerosol Optical Depth Products

Process-Level Quantification on Opposite PM2.5 Changes during the COVID-19 Lockdown over the North China Plain

Changing Responses of PM2.5 and Ozone to Source Emissions in the Yangtze River Delta Using the Adjoint Model

Contact Info

Product

Resources

About

Process-Level Quantification on Opposite PM_2.5 Changes during the COVID-19 Lockdown over the North China Plain

Changing Responses of PM_2.5 and Ozone to Source Emissions in the Yangtze River Delta Using the Adjoint Model