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题名: Hygroscopic behavior of water-soluble matter in marine aerosols over the East China Sea
作者: Yan, Yu1, 2, 5; Fu, Pingqing1, 6; Jing, Bo3; Peng, Chao3; Boreddy, S. K. R.4; Yang, Fan1; Wei, Lianfang6; Sun, Yele1; Wang, Zifa1; Ge, Maofa3
关键词: Hygroscopic properties ; Marine aerosols ; Water-soluble matter ; Levoglucosan ; East China Sea
刊名: SCIENCE OF THE TOTAL ENVIRONMENT
发表日期: 2017-02-01
卷: 578, 页:307-316
收录类别: SCI
英文摘要: In this study, we investigated hygroscopic properties of water-soluble matter (WSM) in marine aerosols over the East China Sea, which were collected during a Natural Science Foundation of China (NSFC) sharing cruise in 2014. Hygroscopic growth factors (g) of WSM were measured by a hygroscopicity tandem differential mobility analyzer (H-TDMA) with an initial dry particle mobility diameter of 100 nm. The observed g at 90% relative humidity (RH), g(90%)(WSM), defined as the ratio of the particle diameter at 90% RH to that at RH <5% (initial dry diameter), ranged from 1.67 to 2.41 (mean +/- std: 1.99 +/- 0.23). The g values were lower than that of seawater (2.1) but comparable with those reported for marine aerosols (1.79-2.08). The H-TDMA retrieved hygroscopicity parameter of WSM, K-WSM, ranged from 0.46 to 1.56 (0.88 +/- 0.35). The observed g(90%)wsm during the daytime ranged from 1.67 to 2.40 (1.95 +/- 0.21) versus 1.71 to 2.41 (2.03 +/- 0.26) during the nighttime. K-WSM was 0.81 0.32 in the daytime and 0.95 +/- 0.40 in the nighttime. The day/night differences of g(90%)(WSM) and Kwsm indicated that nighttime marine aerosols were more hygroscopic than those in daytime, which was likely related to enhanced heterogeneous reaction of ammonium nitrate in nighttime and the higher Cl-/Na+ molar ratios obtained (0.80) in nighttime than those (0.47) in daytime. Inorganic ions accounted for 72-99% of WSM with SO42- being the dominant species, contributing to 47% of the total inorganic ion mass. The declined g (90%) comparing with sea water was likely due to the transport of anthropogenic aerosols, chemical aging of dust particles, the contribution of biomass burning products, and the aerosol hygroscopic growth inhibition of organics. (C) 2016 Elsevier B.V. All rights reserved.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/36322
Appears in Collections:分子动态与稳态结构实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China
2.Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China
3.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, State Key Lab Struct Chem Unstable & Stable Speci, Beijing 100190, Peoples R China
4.Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido 0600819, Japan
5.Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing 210044, Jiangsu, Peoples R China
6.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
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