Real‐Time Characterization of Aerosol Compositions, Sources, and Aging Processes in Guangzhou During PRIDE‐GBA 2018 Campaign

Chen, Wei; Ye, Yuqing; Hu, Weiwei; Zhou, Huaishan; Pan, T.-C. Francis; Wang, Yingkun; Song, Wei; Song, Qicong; Ye, Chenshuo; Wang, Chaomin; Wang, Baolin; Huang, Shan; Yuan, Bin; Zhu, Min; Lian, Xiufeng; Zhang, Guohua; Bi, Xinhui; Jiang, Fan; Liu, Junwen; Canonaco, Francesco; Prévôt, Andrê S. H.; Shao, Min; Wang, Xinming

doi:10.1029/2021jd035114

Cited by 34 publications

(21 citation statements)

References 220 publications

(398 reference statements)

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“…S7), suggesting that the observed nitrate here is nearly inorganic (> 90 %). An increase in inorganic nitrate at higher aerosol concentration has also been observed in other field studies including urban areas (Chen et al, 2021a;Chen et al, 2021b;Griffith et al, 2015;, downwind sites (Qin et al, 2017;Li et al, 2020a) and also other receptor sites (Hu et al, 2013;Li et al, 2014). As the air quality control policy was continuously 235 performed in China, the emission of SO2 decreased substantially compared to that of NO2, and nitrate becomes the dominant secondary component in the fine particles (Xie et al, 2020;Geng et al, 2017a;Li et al, 2019).…”

Section: Concentrations Of Pm1 Chemical Compositionssupporting

confidence: 65%

“…The chemical composition of PM1 was measured by a high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS, manufactured by Aerodyne Research Inc. ARI, USA; "AMS" will be used hereinafter). The detailed introduction and operating principle of AMS can be found in previously published literature (Canagaratna et al, 2007;Drewnick et al, 2005;Chen et al, 2021b). The setup and calibrations of AMS will be briefly introduced in the following.…”

Section: Field Campaignmentioning

confidence: 99%

“…The formation of nitrate has been identified as the following two main chemical pathways: (1) homogeneous reaction of gaseous nitric acid (HNO3) and ammonia (NH3), in which HNO3 is largely produced by photochemical oxidation of NO2 by OH radicals in the daytime (Yang et al, 2022); (2) Heterogeneous hydrolysis of dinitrogen-pentoxide (N2O5), which is the 240 major source of HNO3 at night (Griffith et al, 2015); In general, abundant precursors, high pH and aerosol liquid water content (ALWC) during polluted periods might further promote these two processes (Chen et al, 2021b;. In the remote receptor site of this study, in addition to the chemistry process, regional transport is another important source of high nitrate mass concentration (Squizzato et al, 2012).…”

Section: Concentrations Of Pm1 Chemical Compositionsmentioning

confidence: 99%

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Aging impact on sources, volatility, and viscosity of organic aerosols in the Chinese outflows

Feng

Wang

et al. 2022

Preprint

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Abstract. To investigate the aging impact on sources, volatility, and viscosity of organic aerosols (OA) in the Chinese outflows, a high-resolution time-of-flight aerosol mass spectrometer (HR-AMS) coupled with a thermodenuder (TD) was deployed in the spring of 2018 in Dongying, which is a regional receptor site of metropolitan emissions in North China Plain (NCP). The average mass concentration of PM1 was 31.5 ± 22.7 μg m–3, which was mainly composed of nitrate (33 %) and OA (25 %). The source apportionment results show the OA was mainly contributed by oxygenated OA (OOA) from secondary sources, including background-OOA (33 %) representing a background concentration of OA (2.6 μg m–3) in the NCP area, and transported-OOA (33 %) oxidizing from urban emissions. The other two factors include aged hydrocarbon-liked OA (aged-HOA, 28 %) from transported vehicle emissions and biomass burning OA (BBOA, 5 %) from local open burnings. The volatility of total OA (average C* = 3.2×10–4 µg m–3) in this study is generally lower than those in previous field studies, which is mainly due to the high OA oxidation level resulting from aging processes during transport. The volatilities of OA factors follow the order of background-OOA (average C* = 2.7×10–5 μg m–3) < transported-OOA (3.7×10–4 μg m–3) < aged-HOA (8.1×10–4 μg m–3) < BBOA (0.012 μg m–3), indicating the probable existence of oligomers. The viscosity estimation suggests that the majority of ambient OA in this study behaves as semi-solid (60 %), liquifies at higher RH (21 %), and solidifies (19 %) during noon time when the RH is low and the oxidation level is high. Finally, the estimated mixing time of OA varies dramatically from minutes at night to years in the afternoon, emphasizing the necessity to consider its dynamic kinetic limits when modeling OA. In general, the overall results of this study improve the understanding of the aging impact on OA volatility and viscosity.

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Section: Concentrations Of Pm1 Chemical Compositionssupporting

confidence: 65%

Section: Field Campaignmentioning

confidence: 99%

Section: Concentrations Of Pm1 Chemical Compositionsmentioning

confidence: 99%

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Aging impact on sources, volatility, and viscosity of organic aerosols in the Chinese outflows

Feng

Wang

et al. 2022

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“…The total flow rates through the OFR were between 4.7 and 7.5 L min −1 depending on instrument deployment after OFR at different periods during field measurements corresponding to a calculated mean residence time of 110−170 s. Within the residence time range, no kinetic limitation for condensation of SVOC/LVOC was found due to the high ambient condensation sink in this study (OA concentration is >1.5 ug m −3 ). 50,51 2.3. Instrumentation.…”

Section: Methodsmentioning

confidence: 99%

Oxidation Flow Reactor Results in a Chinese Megacity Emphasize the Important Contribution of S/IVOCs to Ambient SOA Formation

Zhou

Chen

et al. 2021

Environ. Sci. Technol.

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Oxygenated volatile organic compounds (OVOCs) and secondary organic aerosol (SOA) formation potential of ambient air in Guangzhou, China was investigated using a field-deployed oxidation flow reactor (OFR). The OFR was used to mimic hours to weeks of atmospheric exposure to hydroxyl (OH) radicals within the 2–3 min residence time. A comprehensive investigation on the variation of VOCs and OVOCs as a function of OH exposure is shown. Substantial formation of organic acids and nitrogen-containing OVOC species were observed. Maximum SOA formation in the OFR was observed following 1–4 equiv days’ OH exposure. SOA produced from known/measured VOC/IVOC precursors such as single-ring aromatics and long-chain alkanes can account for 52–75% of measured SOA under low NO x and 26–60% under high NO x conditions based on laboratory SOA yield parametrizations. To our knowledge, this is the first time that the contribution (8–20%) of long-chain (C8–C20) alkane oxidation to OFR SOA formation was quantified from direct measurement. By additionally estimating contribution from unmeasured semivolatile and intermediate volatility compounds (S/IVOCs) that are committed with C8–C20 alkanes, 64–100% of the SOA formation observed in the OFR can be explained, signifying the important contribution of S/IVOCs such as large cyclic alkanes to ambient SOA.

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“…S5), suggesting that there were mixing regional and local sources for nitrate and aq-SOA. This supports the aq-SOA is relatively aged in ambient air and influenced by the combination of local formation and regional transport (Lanz et al, 2007;Hayes et al, 2013;Chen et al, 2021).…”

Section: Aq-soamentioning

confidence: 57%

Supplementary material to "Multiple pathways for the formation of secondary organic aerosol in North China Plain in summer"

Gu¹,

Huang²,

Duan³

et al. 2022

Preprint

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Table S2. Concentrations of the main chemical components in PM1/PM2.5 during summer and winter 24 observations in NCP in recent years. 25 26 Sites OA SO4 NO3 NH4 Cl BC PM PM1 NR-PM1 PM2.5 3 44 Table S3. Elemental ratios and OM:OC ratios in OA obtained from field observations at urban and 45 rural/suburban sites. The ratios are corrected by the "improved-ambient" method (Canagaratna et al., 46 2015).

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Real‐Time Characterization of Aerosol Compositions, Sources, and Aging Processes in Guangzhou During PRIDE‐GBA 2018 Campaign

Abstract: Fine particles (or fine aerosols), which can lead to haze formation in mega cities, have substantially impacted on air quality (

Cited by 34 publications

References 220 publications

Aging impact on sources, volatility, and viscosity of organic aerosols in the Chinese outflows

Aging impact on sources, volatility, and viscosity of organic aerosols in the Chinese outflows

Oxidation Flow Reactor Results in a Chinese Megacity Emphasize the Important Contribution of S/IVOCs to Ambient SOA Formation

Supplementary material to "Multiple pathways for the formation of secondary organic aerosol in North China Plain in summer"

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