Gas phase acetic acid and its qualitative effects on snow crystal morphology and the quasi-liquid layer

被引:5
作者
Knepp, T. N. [1 ]
Renkens, T. L. [1 ]
Shepson, P. B. [1 ,2 ,3 ]
机构
[1] Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA
[2] Purdue Univ, Dept Earth & Atmospher Sci, W Lafayette, IN 47907 USA
[3] Purdue Univ, Purdue Climate Change Res Ctr, W Lafayette, IN 47907 USA
基金
美国国家科学基金会;
关键词
MOLECULAR-DYNAMICS SIMULATION; SURFACE OZONE DEPLETION; ATOMIC-FORCE MICROSCOPY; ICE SURFACES; VIBRATIONAL SPECTROSCOPY; AIR/WATER INTERFACE; GROWTH-KINETICS; TROPOSPHERIC CHEMISTRY; WATER INTERFACES; SALT-SOLUTIONS;
D O I
10.5194/acp-9-7679-2009
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A chamber was constructed within which snow crystals were grown on a string at various temperatures, relative humidities, and acetic acid gas phase mole fractions. The temperature, relative humidity, and acid mole fraction were measured for the first time at the point of crystal growth. Snow crystal morphological transition temperature shifts were recorded as a function of acid mole fraction, and interpreted according to the calculated acid concentration in the crystal's quasi-liquid layer, which is believed to have increased in thickness as a function of acid mole fraction, thereby affecting the crystal's morphology consistent with the hypothesis of Kuroda and Lacmann. Deficiencies in the understanding of the quasi-liquid layer and its role in determining snow crystal morphology are briefly discussed.
引用
收藏
页码:7679 / 7690
页数:12
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