气候变化领域集成服务门户(CCPortal): Chemical properties, sources and size-resolved hygroscopicity of submicron black-carbon-containing aerosols in urban Shanghai

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DOI	10.5194/acp-22-8073-2022
	Chemical properties, sources and size-resolved hygroscopicity of submicron black-carbon-containing aerosols in urban Shanghai
	Cui, Shijie; Huang, Dan Dan; Wu, Yangzhou; Wang, Junfeng; Shen, Fuzhen; Xian, Jiukun; Zhang, Yunjiang; Wang, Hongli; Huang, Cheng; Liao, Hong; Ge, Xinlei
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	8073
结束页码	8096
卷号	22 期号:12 页码:24
英文摘要	Refractory black carbon (rBC) aerosols play an important role in air quality and climate change, yet highly time-resolved and detailed investigations on the physicochemical properties of rBC and its associated coating are still scarce. In this work, we used a laser-only Aerodyne soot particle aerosol mass spectrometer (SP-AMS) to exclusively measure rBC-containing (rBCc) particles, and we compared their properties with those of the total nonrefractory submicron particles (NR-PM1) measured in parallel by a high-resolution AMS (HR-AMS) in Shanghai. Observations showed that, overall, rBC was thickly coated, with an average mass ratio of coating to rBC core (R-BC) similar to 5.0 (+/- 1.7). However, the ratio of the mass of the rBC-coating species to the mass of those species in NR-PM1 was only 19.1 (+/- 4.9) %; sulfate tended to condense preferentially on non-rBC particles, so the ratio of the sulfate on rBC to the NR-PM1 sulfate was only 7.4 (+/- 2.2) %, while the majority (72.7 +/- 21.0 %) of the primary organic aerosols (POA) were associated with rBC. Positive matrix factorization revealed that organics emitted from cooking did not coat rBC, and a portion of the organics that coated rBC was from biomass burning; such organics were unidentifiable in NR-PM1. Small rBCc particles were predominantly from traffic, while large-sized ones were often mixed with secondary components and typically had a thick coating. Sulfate and secondary organic aerosol (SOA) species were generated mainly through daytime photochemical oxidation (SOA formation, likely associated with in situ chemical conversion of traffic-related POA to SOA), while nocturnal heterogeneous formation was dominant for nitrate; we also estimated an average time of 5-19 h for those secondary species to coat rBC. During a short period that was affected by ship emissions, particles were characterized as having a high vanadium concentration (on average 6.3 +/- 3.1 ng m(-3)) and a mean vanadium/nickel mass ratio of 2.0 (+/- 0.6). Furthermore, the size-resolved hygroscopicity parameter (kappa(rBCc)) of rBCc particles was obtained based on their full chemical characterization, and was parameterized as kappa(rBCc)(x)= 0.29-0.14 x exp(-0.006 x x) (where x ranges from 150 to 1000 nm). Under critical supersaturations (SSC) of 0.1 % and 0.2 %, the D-50 values were 166 (+/- 16) and 110 (+/- 5) nm, respectively, and 16 (+/- 3) % and 59 (+/- 4) %, respectively, of the rBCc particles by number could be activated into cloud condensation nuclei (CCN). Our findings are valuable for advancing the understanding of BC chemistry as well as the effective control of atmospheric BC pollution.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000814213500001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273112
作者单位	Nanjing University of Information Science & Technology; Zhejiang University; University of Reading
推荐引用方式 GB/T 7714	Cui, Shijie,Huang, Dan Dan,Wu, Yangzhou,et al. Chemical properties, sources and size-resolved hygroscopicity of submicron black-carbon-containing aerosols in urban Shanghai[J],2022,22(12):24.
APA	Cui, Shijie.,Huang, Dan Dan.,Wu, Yangzhou.,Wang, Junfeng.,Shen, Fuzhen.,...&Ge, Xinlei.(2022).Chemical properties, sources and size-resolved hygroscopicity of submicron black-carbon-containing aerosols in urban Shanghai.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(12),24.
MLA	Cui, Shijie,et al."Chemical properties, sources and size-resolved hygroscopicity of submicron black-carbon-containing aerosols in urban Shanghai".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.12(2022):24.