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DOI	10.5194/acp-19-8721-2019
	Is water vapor a key player of the wintertime haze in North China Plain?
	Wu J.; Bei N.; Hu B.; Liu S.; Zhou M.; Wang Q.; Li X.; Liu L.; Feng T.; Liu Z.; Wang Y.; Cao J.; Tie X.; Wang J.; Molina L.T.; Li G.
发表日期	2019
ISSN	16807316
起始页码	8721
结束页码	8739
卷号	19 期号:13
英文摘要	Water vapor has been proposed to amplify the severe haze pollution in China by enhancing the aerosol- radiation feedback (ARF). Observations have revealed that the near-surface PM2:5 concentrations ([PM2:5]) generally exhibit an increasing trend with relative humidity (RH) in the North China Plain (NCP) during 2015 wintertime, indicating that the aerosol liquid water (ALW) caused by hygroscopic growth could play an important role in the PM2:5 formation and accumulation. Simulations during a persistent and heavy haze pollution episode from 5 December 2015 to 4 January 2016 in the NCP were conducted using the WRFChem Model to comprehensively quantify contributions of the ALW effect to near-surface [PM2:5]. The WRF-Chem Model generally performs reasonably well in simulating the temporal variations in RH against measurements in the NCP. The factor separation approach (FSA) was used to evaluate the contribution of the ALW effect on the ARF, photochemistry, and heterogeneous reactions to [PM2:5]. The ALW not only augments particle sizes to enhance aerosol backward scattering but also increases the effective radius to favor aerosol forward scattering. The contribution of the ALW effect on the ARF and photochemistry to near-surface [PM2:5] is not significant, being generally within 1.0 μgm-3 on average in the NCP during the episode. Serving as an excellent substrate for heterogeneous reactions, the ALWsubstantially enhances the secondary aerosol (SA) formation, with an average contribution of 71 %, 10 %, 26 %, and 48% to near-surface sulfate, nitrate, ammonium, and secondary organic aerosol concentrations. Nevertheless, the SA enhancement due to the ALW decreases the aerosol optical depth and increases the effective radius to weaken the ARF, reducing near-surface primary aerosols. The contribution of the ALW total effect to near-surface [PM2:5] is 17.5% on average, which is overwhelmingly dominated by enhanced SA. Model sensitivities also show that when the RH is less than 80 %, the ALW progressively increases near-surface [PM2:5] but commences to decrease when the RH exceeds 80% due to the high occurrence frequencies of precipitation. © Author(s) 2019.
语种	英语
scopus关键词	air quality; atmospheric pollution; haze; particulate matter; relative humidity; water vapor; winter; China; North China Plain
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/144297
作者单位	Key Lab of Aerosol Chemistry and Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, Shaanxi, 710061, China; School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China; State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, Shaanxi, 710061, China; Department of Chemical and Biochemical Engineering and Interdisciplinary Graduate Program in Geo-Informatics, University of Iowa, Iowa City, IA 52242, United States; Molina Center for Energy and the Environment, San Diego, CA 92037, United States; University of Chinese Academy of Science, Beijing, 100049, China
推荐引用方式 GB/T 7714	Wu J.,Bei N.,Hu B.,et al. Is water vapor a key player of the wintertime haze in North China Plain?[J],2019,19(13).
APA	Wu J..,Bei N..,Hu B..,Liu S..,Zhou M..,...&Li G..(2019).Is water vapor a key player of the wintertime haze in North China Plain?.Atmospheric Chemistry and Physics,19(13).
MLA	Wu J.,et al."Is water vapor a key player of the wintertime haze in North China Plain?".Atmospheric Chemistry and Physics 19.13(2019).