Column-integrated aerosol optical properties of coarse- and fine-mode particles over the Pearl River Delta region in China

Mai, Boru; Deng, Xuejiao; Xia, Xue; Che, Huizheng; Guo, Jianping; Liu, X.; Zhu, Jun; Ling, Concepcion F.

doi:10.1016/j.scitotenv.2017.11.348

Cited by 14 publications

(6 citation statements)

References 58 publications

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“…Regions that receive pollutants from distant locations at certain times of the year show seasonal variation in the AE [63], as is the case in some cities in Spain that are affected by dust from the Sahara [64], thereby decreasing the value of the coefficient. Studies in urban regions in China have demonstrated similar values to this study, emphasizing the influence of local emissions on SSA; sites with higher sulfate and nitrate concentrations present higher SSA values [65].…”

Section: Aerosol Optical Properties and Size Distributionsupporting

confidence: 85%

“…The AE increased slightly with increasing SSA, indicating that the increase in the scattering of solar radiation may be related to the predominance of fine particles. Higher SSA values may be associated with sulfate [65]. Sulfates (13.6%), nitrates (2.9%), and ammonium (2.8%) may correspond with up to 20% of the PM2.5 mass in São Paulo [39].…”

Section: Aerosol Optical Properties and Size Distributionmentioning

confidence: 99%

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Chemical Characterization and Optical Properties of the Aerosol in São Paulo, Brazil

Vieira,

do Rosario,

Yamasoe

et al. 2023

Atmosphere

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Air pollution in the Metropolitan Area of São Paulo (MASP), Brazil, is a serious problem and is strongly affected by local sources. However, atmosphere column composition in MASP is also affected by biomass burning aerosol (BB). Understanding the impacts of aerosol particles, from both vehicles and BB, on the air quality and climate depends on in-depth research with knowledge of some parameters such as the optical properties of particles and their chemical composition. This study characterized fine particulate matter (PM2.5) from July 2019 to August 2020 in the eastern part of the MASP, relating the chemical composition data obtained at the surface and columnar optical parameters, such as aerosol optical depth (AOD), Ångström Exponent (AE), and single-scattering albedo (SSA). According to the analyzed data, the mean PM2.5 concentration was 18.0 ± 12.5 µg/m3; however, daily events exceeded 75 times the air quality standard of the World Health Organization (15 µg/m3). The mean black carbon concentration was 1.8 ± 1.5 µg/m3 in the sampling period. Positive matrix factorization (PMF) identified four main sources of aerosol: heavy vehicles (42%), followed by soil dust plus local sources (38.7%), light vehicles (9.9%), and local sources (8.6%). AOD and AE presented the highest values in the dry period, during which biomass burning events are more frequent, suggesting smaller particles in the atmosphere. SSA values at 440 nm were between 0.86 and 0.94, with lower values in the winter months, indicating the presence of more absorbing aerosol.

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Section: Aerosol Optical Properties and Size Distributionsupporting

confidence: 85%

Section: Aerosol Optical Properties and Size Distributionmentioning

confidence: 99%

Chemical Characterization and Optical Properties of the Aerosol in São Paulo, Brazil

Vieira,

do Rosario,

Yamasoe

et al. 2023

Atmosphere

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“…Meanwhile, the aerosols can serve as cloud condensation nuclei or ice nuclei to affect the climate indirectly through aerosol-cloud interactions (Twomey et al, 1984;Garrett and Zhao, 2006;Zhao et al, 2015;Xie et al, 2013). The optical properties of the aerosol determine the particles' direct effects on the Earth's radiative balance and weather-climate change (Ramanathan et al, 2001;Eck et al, 2005;Myhre, 2009;Che et al, 2019a;Li et al, 2016). Aerosol optical depth (AOD) is one of the key measures of the total aerosol extinction effects on climate (Breon et al, 2002), and the extinction Ångström exponent (EAE), with spectral dependence, can be used to obtain the information about aerosol size distributions (Gobbi et al, 2007;Eck et al, 1999;Zheng et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Spatial distribution of aerosol microphysical and optical properties and direct radiative effect from the China Aerosol Remote Sensing Network

et al. 2019

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Abstract. Multi-year observations of aerosol microphysical and optical properties, obtained through ground-based remote sensing at 50 China Aerosol Remote Sensing Network (CARSNET) sites, were used to characterize the aerosol climatology for representative remote, rural, and urban areas over China to assess effects on climate. The annual mean effective radii for total particles (ReffT) decreased from north to south and from rural to urban sites, and high total particle volumes were found at the urban sites. The aerosol optical depth at 440 nm (AOD440 nm) increased from remote and rural sites (0.12) to urban sites (0.79), and the extinction Ångström exponent (EAE440–870 nm) increased from 0.71 at the arid and semi-arid sites to 1.15 at the urban sites, presumably due to anthropogenic emissions. Single-scattering albedo (SSA440 nm) ranged from 0.88 to 0.92, indicating slightly to strongly absorbing aerosols. Absorption AOD440 nm values were 0.01 at the remote sites versus 0.07 at the urban sites. The average direct aerosol radiative effect (DARE) at the bottom of atmosphere increased from the sites in the remote areas (−24.40 W m−2) to the urban areas (−103.28 W m−2), indicating increased cooling at the latter. The DARE for the top of the atmosphere increased from −4.79 W m−2 at the remote sites to −30.05 W m−2 at the urban sites, indicating overall cooling effects for the Earth–atmosphere system. A classification method based on SSA440 nm, fine-mode fraction (FMF), and EAE440–870 nm showed that coarse-mode particles (mainly dust) were dominant at the rural sites near the northwestern deserts, while light-absorbing, fine-mode particles were important at most urban sites. This study will be important for understanding aerosol climate effects and regional environmental pollution, and the results will provide useful information for satellite validation and the improvement of climate modelling.

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“…Dentre seus principais efeitos no clima, como a interação das partículas com a radiação solar, o efeito direto consiste na atenuação do feixe de luz, através das propriedades absorventes e espalhadoras das partículas; enquanto o denominado efeito indireto refere-se à capacidade dos aerossóis em interferir na formação de nuvens e de alterar suas propriedades ópticas e/ou microfísicas (SEINFELD e PANDIS, 2006;MAI et al, 2018). Como consequência da alteração do fluxo da radiação solar resultante de tais efeitos, pode haver interferência no clima regional, além da alteração das taxas de precipitação em escalas locais e regionais, em razão da influência na formação de nuvens (HALLQUIST et al, 2009;POESCHL et al, 2010;MARTIN et al, 2016, PALÁCIOS et al, 2020.…”

Section: Introductionunclassified

Avaliação sazonal do aerossol e suas propriedades ópticas na Zona Leste de São Paulo

Ramos,

Miranda

2023

RBClima

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Na cidade de São Paulo, as altas concentrações de material particulado fino (MP2.5) na atmosfera trazem à tona os problemas relacionados à má qualidade do ar e à saúde humana. O presente trabalho teve como objetivo o estudo do MP2.5 e suas propriedades ópticas na Zona Leste da capital. A partir de dados fornecidos pelas estações de monitoramento da qualidade do ar da CETESB, e por um fotômetro pertencente à rede AERONET (https://aeronet.gsfc.nasa.gov), foram analisados a variação temporal do MP2.5, e os parâmetros profundidade óptica do aerossol (AOD), expoente de Ångström (AE) e albedo simples (SSA), no período entre 2017 e 2021. Os resultados mostraram que, ao longo dos 5 anos, as concentrações do poluente estudado ficaram acima do padrão diário de qualidade do ar da CETESB em 19 dias, e acima do valor recomendado pela Organização Mundial da Saúde (OMS) em 913 dias. A concentração média do MP2.5 para o período foi de 17,79 μg/m³. As concentrações de MP2.5, assim como os parâmetros AE, AOD e SSA, apresentaram picos em seus valores durante a estação seca, devido às condições meteorológicas desfavoráveis, influenciados pelas fontes locais e por aerossóis provenientes da queima de biomassa. Os resultados indicaram a necessidade de atenção por parte dos órgãos competentes para incentivar novas tecnologias e medidas que minimizem a emissão de poluentes, especialmente na Zona Leste de São Paulo, região densamente povoada, com a presença de indústrias e vias de grande tráfego de veículos.

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Column-integrated aerosol optical properties of coarse- and fine-mode particles over the Pearl River Delta region in China

Cited by 14 publications

References 58 publications

Chemical Characterization and Optical Properties of the Aerosol in São Paulo, Brazil

Chemical Characterization and Optical Properties of the Aerosol in São Paulo, Brazil

Spatial distribution of aerosol microphysical and optical properties and direct radiative effect from the China Aerosol Remote Sensing Network

Avaliação sazonal do aerossol e suas propriedades ópticas na Zona Leste de São Paulo

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