Chemical characterization, the transport pathways and potential sources of PM2.5 in Shanghai: Seasonal variations

Zhao, Mengfei; Huang, Zhongsi; Qiao, Ting; Zhang, Yuankai; Xiu, Guangli; Yu, Jianzhen

doi:10.1016/j.atmosres.2015.02.003

Cited by 138 publications

(59 citation statements)

References 78 publications

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“…This means that anions extracted from PM 2.5 could have come also from compounds with other elements than those determined in the cation forms in the water extracts. As the sum of the crustal and trace elements usually makes a small percentage of the PM 2.5 mass (Sillanpää et al, 2006;Zhao et al, 2015), it seems probable that some part of SO 4 2-and NO 3 -in PM 2.5 could have formed compounds with hydrogen (undetermined in the extracts) before the extraction. The highest daily values of Σ cations /Σ anions ratio was observed in Racibórz in the heating season of 2011 (Fig.…”

Section: Ionic Compounds Si Contributionmentioning

confidence: 99%

“…The recent interest has been focused on the chemical composition of particulate matter (PM), especially carbonaceous fractions and water-soluble ions, as they have predominant contribution to the PM 2.5 mass (according to Directive 2008/50/EC: "fine PM; shall mean particulate matter which passes through a size-selective inlet as defined in the reference method for the sampling and measurement of PM 2.5 , EN14907, with a 50% efficiency cut-off at 2.5 µm aerodynamic diameter") Zhang et al, 2014;Zhao et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Chemical Compositions of PM2.5 at Two Non-Urban Sites from the Polluted Region in Europe

Błaszczak

Rogula–Kozłowska

Mathews

et al. 2016

Aerosol Air Qual. Res.

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The study presents the analysis of measurement results for the ambient mass concentrations of fine particulate matter (PM 2.5 ). The 24-h PM 2.5 samples were collected in the heating and non-heating seasons at two regional background sites in Southern Poland in 2011-2013. The percentage of the secondary organic and inorganic matter in PM 2.5 was calculated.Over the whole measurement period, the mean PM 2.5 concentration was 31.56 µg m -3 and 24.92 µg m -3 in Racibórz and Złoty Potok, respectively. Regardless of the season, the total carbon percentage in PM 2.5 was comparable at both sites and amounted ~40%. There were no visible seasonal variations in the secondary organic carbon (SOC) share in PM 2.5 . The mean percentage of the primary organic carbon (POC) in PM 2.5 was higher than the SOC percentage at both locations. The mean contribution of the water-soluble ions in the PM 2.5 mass was lower than the TC percentage, with values 20.35% (Złoty Potok) and 33.56% (Racibórz). The total share of the secondary ions (SO 4 2-, NO 3 -and NH 4 + ) in PM 2.5 was comparable in both measurement periods.It was shown that PM 2.5 at regional background sites in Southern Poland is significantly different than at similar stations across Europe. It is reflected by higher concentrations of PM 2.5 and its main components and lower percentage of the secondary ions in the PM 2.5 mass. The carbonaceous matter percentage in PM 2.5 is higher than in other parts of Europe.

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Section: Ionic Compounds Si Contributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chemical Compositions of PM2.5 at Two Non-Urban Sites from the Polluted Region in Europe

Błaszczak

Rogula–Kozłowska

Mathews

et al. 2016

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

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“…The start height was set as 500 m above ground level (Zhao et al, 2015;Liu et al, 2016). The FNL global analysis data produced by the National Center for Environmental Prediction's Global Data Assimilation System (GDAS) wind field reanalysis were introduced into the calculation.…”

Section: Backward Trajectory Analysismentioning

confidence: 99%

Monitoring of volatile organic compounds (VOCs) from an oil and gas station in northwest China for 1 year

et al. 2018

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Abstract. Oil and natural gas are important for energy supply around the world. The exploring, drilling, transportation and processing in oil and gas regions can release a lot of volatile organic compounds (VOCs). To understand the VOC levels, compositions and sources in such regions, an oil and gas station in northwest China was chosen as the research site and 57 VOCs designated as the photochemical precursors were continuously measured for an entire year (September 2014-August 2015) using an online monitoring system. The average concentration of total VOCs was 297 ± 372 ppbv and the main contributor was alkanes, accounting for 87.5 % of the total VOCs. According to the propylene-equivalent concentration and maximum incremental reactivity methods, alkanes were identified as the most important VOC groups for the ozone formation potential. Positive matrix factorization (PMF) analysis showed that the annual average contributions from natural gas, fuel evaporation, combustion sources, oil refining processes and asphalt (anthropogenic and natural sources) to the total VOCs were 62.6 ± 3.04, 21.5 ± .99, 10.9 ± 1.57, 3.8 ± 0.50 and 1.3 ± 0.69 %, respectively. The five identified VOC sources exhibited various diurnal patterns due to their different emission patterns and the impact of meteorological parameters. Potential source contribution function (PSCF) and concentration-weighted trajectory (CWT) models based on backward trajectory analysis indicated that the five identified sources had similar geographic origins. Raster analysis based on CWT analysis indicated that the local emissions contributed 48.4-74.6 % to the total VOCs. Based on the high-resolution observation data, this study clearly described and analyzed the temporal variation in VOC emission characteristics at a typical oil and gas field, which exhibited different VOC levels, compositions and origins compared with those in urban and industrial areas.

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“…Although the PSCF model is a practical tool often used to locate potential source areas (e.g., Zhang et al, 2013b;Dimitriou, 2015;Zhu et al, 2016), a restriction of this method is that the same PSCF values may occur in different grid cells when BC loadings at the receptor site are either substantially larger or only slightly larger than the criterion value, which is often derived as the arithmetic mean (e.g., Wang et al, 2004;Xu and Akhtar, 2010;Zhao et al, 2015). This may lead to difficulties in differentiating heavy pollution sources from moderate ones.…”

Section: Bc Potential Pollution Source Areasmentioning

confidence: 99%

Seasonal Characteristics of Black Carbon Aerosol and its Potential Source Regions in Baoji, China

Zhou

Wang

Zhou

et al. 2018

Aerosol Air Qual. Res.

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Continuous measurements of black carbon (BC) aerosol were made at a midsized urban site in Baoji, China, in 2015. The daily average mass concentrations varied from 0.6 to 11.5 µg m -3 , with an annual mean value of 2.9 ± 1.7 µg m -3 . The monthly variation indicated that the largest loading of BC occurred in January and the smallest in June. The mass concentrations exhibited strong seasonality, with the highest occurring in winter and the lowest in summer. The large BC loadings in winter were attributed to the increased use of fuel for domestic heating and to stagnant meteorological conditions, whereas the low levels in summer were related to the increase in precipitation. BC values exhibited similar bimodal diurnal patterns during the four seasons, with peaks occurring in the morning and evening rush hours and an afternoon trough, which was associated with local anthropogenic activities and meteorological conditions. A potential source contribution function model indicated that the effects of regional transport mostly occurred in spring and winter. The most likely regional sources of BC in Baoji were southern Shaanxi province, northwestern Hubei province, and northern Chongqing during spring, whereas the northeastern Sichuan Basin was the most important source region during winter.

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Chemical characterization, the transport pathways and potential sources of PM2.5 in Shanghai: Seasonal variations

Cited by 138 publications

References 78 publications

Chemical Compositions of PM2.5 at Two Non-Urban Sites from the Polluted Region in Europe

Chemical Compositions of PM2.5 at Two Non-Urban Sites from the Polluted Region in Europe

Monitoring of volatile organic compounds (VOCs) from an oil and gas station in northwest China for 1 year

Seasonal Characteristics of Black Carbon Aerosol and its Potential Source Regions in Baoji, China

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