Characterization and source apportionment of size-segregated atmospheric particulate matter collected at ground level and from the urban canopy in Tianjin

Wang, Jiao; Zhou, Ming; Liu, Bao-shuang; Wu, Jianhui; Peng, Xing; Zhang, Yufen; Si, Han; Feng, Yinchang; Zhu, Tong

doi:10.1016/j.envpol.2016.10.069

Cited by 47 publications

(22 citation statements)

References 76 publications

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“…Vertical measurements can be an essential complement to characterize the formation mechanisms of secondary aerosol species and evaluate the roles of regional transport and local emissions in haze formation . For example, previous vertical measurements on the meteorological towers in Beijing and Tianjin showed complex vertical distributions and distinct layered structures of PM and gaseous pollutants (Chan et al, 2005;Han et al, 2015;Meng et al, 2008;Wang, Zhou, et al, 2016). However, most of these studies are limited by the offline filter sampling with relatively low time resolution (~24 hr), which neither reveals the rapid evolution of haze nor the variations of aerosol composition within low boundary layer.…”

Section: Introductionmentioning

confidence: 99%

Vertical Characterization of Aerosol Particle Composition in Beijing, China: Insights From 3‐Month Measurements With Two Aerosol Mass Spectrometers

Zhou

Sun

et al. 2018

JGR Atmospheres

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Despite extensive studies for characterization of aerosol chemistry near ground level, long‐term vertical characterization of aerosol particle composition in Beijing is very limited. In this work, non‐refractory submicron aerosol (NR‐PM1) species were simultaneously measured at ground level and 260 m on a meteorological tower from 14 October 2014 to 18 January 2015 in Beijing using two aerosol mass spectrometers. Our results showed overall lower concentrations of NR‐PM1 at 260 m by 2%–36% than ground level in both heating and non‐heating seasons, and also larger vertical gradients during clean periods than polluted episodes. The vertical ratios and correlations of aerosol species between ground level and 260 m presented higher values in daytime and lower ones at nighttime mainly due to the influences of planetary boundary layer and local source emissions, respectively. Nitrate showed ubiquitously higher ratio of 260 m to ground (ratio260m/ground) than sulfate due to a higher formation potential from gas‐particle partitioning and heterogeneous reactions at higher heights. A detailed analysis of vertical evolution showed relatively stable ratios260m/ground for secondary aerosol species during the early formation stage of haze episodes, which decreased simultaneously along with mixing layer height during the later severely polluted periods with NR‐PM1 concentration above 150 μg/m3. Our results demonstrated that the evolution of vertical differences in megacities is subject to the influences from both physical (e.g., regional transport, mountain‐valley winds, inversions of temperature and relative humidity, and mixing layer height) and chemical processes (e.g., gas‐particle partitioning and aqueous‐phase processing).

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Section: Introductionmentioning

confidence: 99%

Vertical Characterization of Aerosol Particle Composition in Beijing, China: Insights From 3‐Month Measurements With Two Aerosol Mass Spectrometers

Zhou

Sun

et al. 2018

JGR Atmospheres

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“…气象塔是研究城市边界层理化结构的重要平台, 特别是靠近城市中心的北京325 m气象塔 [17] 和天津 255 m气象塔 [18] , 可以深入研究城市地区大气污染物的垂直分布和边界层要素的耦合作用机制 . 北京 325 m气象塔目前拥有15层气象要素(温度、湿度、风速和风向)、7层湍流、CO 2 /H 2 O [19] 和3层辐射长期连续观测, 但独缺大气化学观测平台.…”

Section: 城市边界层理化结构探测unclassified

Vertical structures of physical and chemical properties of urban boundary layer and formation mechanisms of atmospheric pollution

Yele¹

2018

Chin. Sci. Bull.

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“…Emission sources of PM are numerous and commonly include industrial and commercial output, vehicular emissions and wear, abrasion of road surfaces, etc. (Wang et al 2016). Another large source of PM is believed to be resuspended road dust (RD), which can account for as much as 74% of total suspended particles by mass (Hien et al 1999;Harrison et al 1997) and has also been observed to be the largest and second largest contributor to PM 10 and PM 2.5, respectively (Landis et al 2017).…”

Section: Introductionmentioning

confidence: 99%

An investigation into the use of < 38 µm fraction as a proxy for < 10 µm road dust particles

Brown

Barrett

Bennett

et al. 2019

Environ Geochem Health

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It is well documented that a large portion of urban particulate matters is derived from road dust. Isolating particles of RD which are small enough to be inhaled, however, is a difficult process. In this study, it is shown for the first time that the\ 38 lm fraction of road dust particles can be used as a proxy for road dust particles \ 10 lm in bioaccessibility studies. This study probed similarities between the \ 10 and \ 38 lm fractions of urban road dust to show that the larger of the two can be used for analysis for which larger sample masses are required, as is the case with in vitro analysis. Road dust, initially segregated to size \ 38 lm using sieves, was again size segregated to \ 10 lm using water deposition. Both the original \ 38 lm and the separated \ 10 lm fractions were then subject to single particle analysis by SEM-EDX and bulk analysis by ICP-OES for its elemental composition. Dissolution tests in artificial lysosomal fluid, representative of lung fluid, were carried out on both samples to determine % bioaccessibility of selected potentially harmful elements and thus probe similarities/differences in in vitro behaviour between the two fractions. The separation technique achieved 94.3% of particles \ 10 lm in terms of number of particles (the original sample contained 90.4% as determined by SEM-EDX). Acid-soluble metal concentration results indicated differences between the samples. However, when manipulated to negate the input of Si, SEM-EDX data showed general similarities in metal concentrations. Dissolution testing results indicated similar behaviour between the two samples in a simulated biological fluid.

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Characterization and source apportionment of size-segregated atmospheric particulate matter collected at ground level and from the urban canopy in Tianjin

Cited by 47 publications

References 76 publications

Vertical Characterization of Aerosol Particle Composition in Beijing, China: Insights From 3‐Month Measurements With Two Aerosol Mass Spectrometers

Vertical Characterization of Aerosol Particle Composition in Beijing, China: Insights From 3‐Month Measurements With Two Aerosol Mass Spectrometers

Vertical structures of physical and chemical properties of urban boundary layer and formation mechanisms of atmospheric pollution

An investigation into the use of < 38 µm fraction as a proxy for < 10 µm road dust particles

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