DOI: 10.1002/2016JD025619
论文题名: Laboratory observations of temperature and humidity dependencies of nucleation and growth rates of sub-3 nm particles
作者: Yu H. ; Dai L. ; Zhao Y. ; Kanawade V.P. ; Tripathi S.N. ; Ge X. ; Chen M. ; Lee S.-H.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 3 起始页码: 1919
结束页码: 1929
语种: 英语
英文关键词: atmospheric sub-3 nm particles
; growth rate
; nucleation rate
Scopus关键词: aerosol
; algorithm
; boundary layer
; concentration (composition)
; condensation
; experimental study
; growth rate
; laboratory method
; nucleation
; particle size
; relative humidity
; sulfuric acid
; temperature
; temperature gradient
英文摘要: 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. 资助项目: 1241498
; 1241498
; 41405116
; 41675124
; AGS-1137821
; AGS-1137821
; BK20140989
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62714
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: 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)