Highly time-resolved chemical characterization and implications of regional transport for submicron aerosols in the North China Plain

Li, Jiayun; Liu, Zirui; Cao, Liming; Gao, Wenkang; Yan, Yong; Mao, J.; Zhang, Xinghua; He, Lingyan; Xin, Jinyuan; Tang, Guiqian; Ji, Dongsheng; Hu, Bo; Wang, Lili; Wang, Yonghong; Dai, Lindong; Zhao, Dandan; Du, Wei; Wang, Yuesi

doi:10.1016/j.scitotenv.2019.135803

Cited by 24 publications

(12 citation statements)

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“…winter (Li et al, 2019b), but comparable to the value observed at a rural station (Wang et al, 2016), suggesting that aerosols in the background atmosphere were homogeneously distributed. Therefore, the winds showed a weaker influence in terms of 210 diluting aerosol particles than the result observed in Beijing.…”

Section: Seasonality Of Meteorological Effects On Pm1 Speciessupporting

confidence: 73%

“…can be considered as an ideal station to investigate haze episodes in the NCP on a regional scale. More details about Xinglong station can be found everywhere (Li et al, 2019b;Tian et al, 2018). 95…”

Section: Sampling Sites 90mentioning

confidence: 99%

“…Milos520 (Vaisala, Finland) was used to obtain the meteorological parameters. More details about the instruments can be seen in Li et al (2019b).…”

Section: Instrumentation and Operationmentioning

confidence: 99%

“…The high-resolution characterization of PM1 species in the background 60 atmosphere in the NCP is limited. Until recently, Li et al (2019b) deployed combined measurements of submicron aerosols at an urban and a background station in the NCP using a HR-ToF-AMS and a quadrupole AMS, respectively. The results showed that nitrate accounted for the highest proportions of PM1 in winter, which was affected by local chemical production and https://doi.org/10.5194/acp-2020-213 Preprint.…”

Section: Introductionmentioning

confidence: 99%

“…Few observations 65 of PM1 chemical components in the regional background area in the NCP using HR-TOF-AMS covering four seasons have been reported. Moreover, a previous study in Xinglong (Li et al, 2019b) was based on unit mass resolution, without elemental information and only one secondary organic aerosol (OOA) factor identified in the study. The HR-ToF-AMS can provide elemental information, such as hydrogen-to-carbon (H/C), organic-mass-to-organic-carbon (OM/OC), and oxygen-to-carbon (O/C), which can help to quantify the oxidation degree of OA (Jimenez, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Seasonal variations in the high time-resolved aerosol composition, sources, and chemical process of background submicron particles in North China Plain

Li¹,

Cao²,

Gao³

et al. 2020

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Abstract. For the first time in the North China Plain (NCP), we investigated the seasonal variations of submicron particles (NR-PM1) and its chemical composition at a background mountain station using Aerodyne high-resolution time-of-flight aerosol mass spectrometry (HR-ToF-AMS). The averaged NR-PM1 were highest in autumn (15.1 μg m−3) and lowest in summer (12.4 μg m−3), with the abundance of more nitrate in spring (34 %), winter (31 %), and autumn (34 %), and elevated organics (40 %) and sulfate (38 %) proportion in summer. The submicron particles were almost neutralized by excess ammonium in all four seasons except summer, when the aerosol particles appeared to be slightly acidic. The size distribution of all PM1 species showed a consistent accumulation mode peaked at approximately 600–800 nm (dva), indicating the highly aged and internally mixed nature of the background aerosols, which further supported by the source appointment using multilinear engine (ME-2) and significant contributions of aged secondary organic aerosol (SOA) in organic aerosol (OA) were resolved in all seasons (> 77 %), especially in summer (95 %). The oxidation degree and evolution process of OAs in the four seasons were further investigated, and enhanced carbon oxidation state (−0.45–0.10), O / C (0.54–0.75) and OM / OC (1.86–2.13) ratios compared with urban studies were observed, with the highest oxidation degree of which appeared in summer, likely due to the relatively stronger photochemical processing which dominated the processes of both less oxidized OA (LO-OOA) and more oxidized OA (MO-OOA) formations. Aqueous-phase processing also contributed to the SOA formation but prevailed in autumn and winter and the role of which to MO-OOA and LO-OOA also varied in different seasons. In addition, compared with the urban atmosphere, LO-OOA formation in the background atmosphere exhibited more regional characteristics, as photochemical and aqueous-phase processing enhanced during the transport in summer and autumn, respectively. Furthermore, the backward trajectories analysis showed that higher submicron particles were associated with air mass for short distance transported from the southern regions in four seasons, while the long-range transport from Inner Mongolia (west and north regions) also contributed to the summer particle pollutions in the background areas of NCP. Our results illustrate the background particles in NCP are influenced significantly by aging processing and transport, and the more neutralized state of submicron particles with the abundance of nitrate compared with those in the background atmosphere in southern and western China, highlighting the regional reductions in emissions of nitrogen oxide and ammonia are critical for remedying the increased occurrence of nitrate-dominated haze event in the NCP.

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Section: Seasonality Of Meteorological Effects On Pm1 Speciessupporting

confidence: 73%

Section: Sampling Sites 90mentioning

confidence: 99%

“…Milos520 (Vaisala, Finland) was used to obtain the meteorological parameters. More details about the instruments can be seen in Li et al (2019b).…”

Section: Instrumentation and Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%