DOI: 10.1016/j.atmosenv.2013.12.040
Scopus记录号: 2-s2.0-84893129852
论文题名: Water adsorption constrained Frenkel-Halsey-Hill adsorption activation theory: Montmorillonite and illite
作者: Hatch C ; D ; , Greenaway A ; L ; , Christie M ; J ; , Baltrusaitis J
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 87 起始页码: 26
结束页码: 33
语种: 英语
英文关键词: Adsorption activation
; CCN
; Clay minerals
; Dust
; FHH
; Water adsorption
Scopus关键词: Adsorption parameters
; CCN
; Cloud condensation nuclei
; FHH
; Mineral dust aerosol
; Na-montmorillonite
; Theoretical framework
; Water adsorption
; Aerosols
; Clay minerals
; Climate models
; Dust
; Parameter estimation
; Adsorption
; illite
; mineral
; montmorillonite
; unclassified drug
; water
; adsorption
; aerosol
; atmospheric modeling
; cloud condensation nucleus
; cloud droplet
; dust
; hygroscopicity
; illite
; montmorillonite
; adsorption
; aerosol
; article
; chemical parameters
; clay
; cloud condensation nuclei
; conceptual framework
; frenkel halsey hill adsorption activation theory
; hydration
; mineral dust
; particle size
; priority journal
; water adsorption
; water content
; wettability
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Fresh mineral aerosol has recently been found to be effective cloud condensation nuclei (CCN) and contribute to the number of cloud droplets in the atmosphere due to the effect of water adsorption on CCN activation. The work described here uses experimental water adsorption measurements on Na-montmorillonite and illite clay to determine empirical adsorption parameters that can be used in a recently derived theoretical framework (Frenkel-Halsey-Hill Activation Theory, FHH-AT) that accounts for the effect of water adsorption on CCN activation. Upon fitting the Frenkel-Halsey-Hill (FHH) adsorption model to water adsorption measurements, we find FHH adsorption parameters, AFHH and BFHH, to be 98±22 and 1.79±0.11 for montmorillonite and 75±17 and 1.77±0.11 for illite, respectively. The AFHH and BFHH values obtained from water adsorption measurements differ from values reported previously determined by applying FHH-AT to CCN activation measurements. Differences in FHH adsorption parameters were attributed to different methods used to obtain them and the hydratable nature of the clays. FHH adsorption parameters determined from water adsorption measurements were then used to calculate the critical super-saturation (sc) for CCN activation using FHH-AT. The relationship between sc and the dry particle diameter (Ddry) gave CCN activation curve exponents (xFHH) of-0.61 and-0.64 for montmorillonite and illite, respectively. The xFHH values were slightly lower than reported previously for mineral aerosol. The lower exponent suggests that the CCN activity of hydratable clays is less sensitive to changes in Ddry and the hygroscopicity parameter exhibits a broader variability with Ddry compared to more soluble aerosols. Despite the differences in AFHH, BFHH and xFHH, the FHH-AT derived CCN activities of montmorillonite and illite are quite similar to each other and in excellent agreement with experimental CCN measurements resulting from wet-generated clay aerosol. This study illustrates that FHH-AT using adsorption parameters constrained by water adsorption is a simple, valid method for predicting CCN activation of fresh clay minerals and provides parameters that can be used in atmospheric models to study the effect of mineral dust aerosol on cloud formation and climate. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80721
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Chemistry, Hendrix College, 1600 Washington Ave., Conway, AR, United States; Department of Chemistry and Central Microscopy Research Facility, University of Iowa, John W. Eckstein Medical Research Building 76, Iowa City, IA 52242, United States
Recommended Citation:
Hatch C,D,, Greenaway A,et al. Water adsorption constrained Frenkel-Halsey-Hill adsorption activation theory: Montmorillonite and illite[J]. Atmospheric Environment,2014-01-01,87