Preprints
https://doi.org/10.5194/acp-2020-507
https://doi.org/10.5194/acp-2020-507
10 Aug 2020
 | 10 Aug 2020
Status: this preprint was under review for the journal ACP but the revision was not accepted.

Measurement Report: Size distributions of inorganic and organic components in particulate matter from a megacity in northern China: dependence upon seasons and pollution levels

Yingze Tian, Yinchang Feng, Yongli Liang, Yixuan Li, Qianqian Xue, Zongbo Shi, Jingsha Xu, and Roy M. Harrison

Abstract. Size distributions of inorganic and organic components in particulate matter (PM) provide critical information on its sources, fate and pollution processes. Here, ions, elements, carbon fractions, n-alkanes, polycyclic aromatic hydrocarbons (PAHs), hopanes and steranes in size-resolved (9 stages) PM were analyzed during one year in a typical northern Chinese industrial megacity (Tianjin). We found that the concentrations of organic carbon fraction OC3, NO3 (or SO42−) and the sum of crustal elements were the highest in the pseudo-ultrafine (< 0.43 μm), fine (0.41–2.1 μm) and coarse (> 2.1 μm) modes, respectively. The diagnostic ratios of organic components consistently suggest that the traffic influence was stronger during summer and coal combustion during winter. Nitrate and high molecular weight PAHs were concentrated in the fine mode during winter, while nitrate and low molecular weight PAHs showed bimodal distributions especially during summer due to repartitioning. Long-chain n-alkanes showed a peak in the coarse mode during spring and summer, indicating a relatively stronger vegetation source and resuspended dust. Furthermore, we found a major difference in the size distribution of aerosol components during heavy pollution episodes (PM10 > 233 μg m−3) in different seasons: in spring, OC fractions, 4- and 5-ring PAHs, hopanes and C18–C33 n-alkanes were enhanced at 1.1–3.3 μm, implying that they may arise from local combustion sources which emit relatively large particles; in summer PM mass, SO42−, NH4+, Al, and C26–C33 n-alkanes were enhanced mainly in the coarse mode, peaking at 5.8–9.0 μm, indicating a large contribution from resuspended dust or heterogeneous reactions on dusts; in the winter and autumn, NO3 was significantly enhanced followed by SO42−, NH4+, OC and EC with their peaks shifting from 0.43–0.65 μm to 0.65–2.1 μm, indicating strong atmospheric processing. These results reveal that the size distributions of inorganic and organic aerosol components are dependent on the seasons and pollution levels as a result of the differing sources and physicochemical processes.

Yingze Tian, Yinchang Feng, Yongli Liang, Yixuan Li, Qianqian Xue, Zongbo Shi, Jingsha Xu, and Roy M. Harrison
 
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Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Yingze Tian, Yinchang Feng, Yongli Liang, Yixuan Li, Qianqian Xue, Zongbo Shi, Jingsha Xu, and Roy M. Harrison
Yingze Tian, Yinchang Feng, Yongli Liang, Yixuan Li, Qianqian Xue, Zongbo Shi, Jingsha Xu, and Roy M. Harrison

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Short summary
Size distributions of inorganic and organic components in particulate matter (PM) can provide critical information on sources and pollution processes. Ions, elements, carbon fractions, n-alkanes, PAHs, hopanes and steranes in size-resolved PM were analyzed during one year in a northern Chinese megacity. Results reveal that size distributions of inorganic and organic aerosol components are dependent on seasons and pollution levels as a result of differing sources and physicochemical processes.
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