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Is water vapor a key player of the wintertime haze in North China Plain?
Wu, JR (Wu, Jiarui)[ 1,4,8 ] ;  Bei, NF (Bei, Naifang)[ 2 ] ;  Hu, B (Hu, Bo)[ 3 ] ;  Liu, SX (Liu, Suixin)[ 1,4 ] ;  Zhou, M (Zhou, Meng)[ 5,6 ] ;  Wang, QY (Wang, Qiyuan)[ 1,4 ] ;  Li, X (Li, Xia)[ 1,4,8 ] ;  Liu, L (Liu, Lang)[ 1,4,8 ] ;  Feng, T (Feng, Tian)[ 1 ] ;  Liu, ZR (Liu, Zirui)[ 3 ] ;  Wang, YC (Wang, Yichen)[ 1 ] ;  Cao, JJ (Cao, Junji)[ 1,4 ] ;  Tie, XX (Tie, Xuexi)[ 1,4 ] ;  Wang, J (Wang, Jun)[ 5,6 ] ;  Molina, LT (Molina, Luisa T.)[ 7 ] ;  Li, GH (Li, Guohui)[ 1,4 ]
2019-07-10
Source PublicationATMOSPHERIC CHEMISTRY AND PHYSICS
Volume19Issue:13Pages:8721-8739
Contribution Rank1
AbstractWater 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 WRF-Chem 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 mu g m(-3) on average in the NCP during the episode. Serving as an excellent substrate for heterogeneous reactions, the ALW substantially 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.
KeywordSECONDARY ORGANIC AEROSOL SURFACE BOUNDARY-LAYER PEARL RIVER-DELTA TIANJIN-HEBEI BTH RELATIVE-HUMIDITY AIR-POLLUTION HYGROSCOPIC GROWTH MEXICO-CITY METEOROLOGICAL CONDITIONS HETEROGENEOUS HYDROLYSIS
DOI10.5194/acp-19-8721-2019
Language英语
WOS IDWOS:000474738000003
PublisherCOPERNICUS GESELLSCHAFT MBH
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/11124
Collection粉尘与环境研究室
Affiliation1.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Key Lab Aerosol Chem & Phys, Xian 710061, Shaanxi, Peoples R China
2.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Shaanxi, Peoples R China
3.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China
4.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Shaanxi, Peoples R China
5.Univ Iowa, Dept Chem & Biochem Engn, Iowa City, IA 52242 USA
6.Univ Iowa, Interdisciplinary Grad Program Geoinformat, Iowa City, IA 52242 USA
7.Molina Ctr Energy & Environm, La Jolla, CA 92037 USA
8.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wu, JR , Bei, NF , Hu, B ,et al. Is water vapor a key player of the wintertime haze in North China Plain?[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(13):8721-8739.
APA Wu, JR ., Bei, NF ., Hu, B ., Liu, SX ., Zhou, M .,...& Li, GH .(2019).Is water vapor a key player of the wintertime haze in North China Plain?.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(13),8721-8739.
MLA Wu, JR ,et al."Is water vapor a key player of the wintertime haze in North China Plain?".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.13(2019):8721-8739.
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