globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD025619
Laboratory observations of temperature and humidity dependencies of nucleation and growth rates of sub-3 nm particles
Author: Yu H.; Dai L.; Zhao Y.; Kanawade V.P.; Tripathi S.N.; Ge X.; Chen M.; Lee S.-H.
Source Publication: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
Publishing Year: 2017
Volume: 122, Issue:3
pages begin: 1919
pages end: 1929
Language: 英语
Keyword: atmospheric sub-3 nm particles ; growth rate ; nucleation rate
Scopus Keyword: aerosol ; algorithm ; boundary layer ; concentration (composition) ; condensation ; experimental study ; growth rate ; laboratory method ; nucleation ; particle size ; relative humidity ; sulfuric acid ; temperature ; temperature gradient
English Abstract: Temperature and relative humidity (RH) are the most important thermodynamic parameters in aerosol formation, yet laboratory studies of nucleation and growth dependencies on temperature and RH are lacking. Here we report the experimentally observed temperature and RH dependences of sulfuric acid aerosol nucleation and growth. Experiments were performed in a flow tube in the temperature range from 248 to 313 K, RH from 0.8% to 79%, and relative acidity (RA) of sulfuric acid from 6 × 10−5 to 0.38 (2 × 107–109 cm−3). The impurity levels of base compounds were determined to be NH3 < 23 pptv (parts per thousand by volume), methylamine < 1.5 pptv, and dimethylamine < 0.52 pptv. Our results showed that low temperatures favor nucleation at fixed sulfuric acid concentration but impede nucleation when RA is fixed. It is also shown that binary nucleation of sulfuric acid and water is negligible in planetary boundary layer temperature and sulfuric acid ranges. An empirical algorithm was derived to correlate the nucleation rate with RA, RH, and temperature together. Collision-limited condensation of free-sulfuric acid molecules fails to predict the observed growth rate in the sub-3 nm size range, as well as its dependence on temperature and RH. This suggests that evaporation, sulfuric acid hydration, and possible involvement of other ternary molecules should be considered for the sub-3 nm particle growth. ©2017. American Geophysical Union. All Rights Reserved.
Funding Project: 1241498 ; 1241498 ; 41405116 ; 41675124 ; AGS-1137821 ; AGS-1137821 ; BK20140989
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Document Type: 期刊论文
Appears in Collections:影响、适应和脆弱性

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Affiliation: School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, China; University Centre for Earth and Space Sciences, University of Hyderabad, Hyderabad, India; Centre for Environmental Science and Engineering and Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, India; Department of Atmospheric Sciences, University of Alabama in Huntsville, Huntsville, AL, United States

Recommended Citation:
Yu H.,Dai L.,Zhao Y.,et al. Laboratory observations of temperature and humidity dependencies of nucleation and growth rates of sub-3 nm particles[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(3)
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