The influence of methane, acetylene and carbon dioxide on the crystallization of supercooled ethane droplets in Titan's clouds

被引：11
|
作者：
Lang, E. Kathrin [1 ]
Knox, Kerry J. [1 ]
Wang, Chia C. [1 ]
Signorell, Ruth [1 ]
机构：
[1] Univ British Columbia, Dept Chem, Vancouver, BC V6T 1Z1, Canada
来源：
PLANETARY AND SPACE SCIENCE | 2011年 / 59卷 / 08期
基金：
加拿大创新基金会; 加拿大自然科学与工程研究理事会;
关键词：
Titan; Aerosol; Ethane; Infrared spectroscopy; Nucleation; Freezing mechanism; INFRARED-SPECTRA; VIBRATIONAL-SPECTRA; ATMOSPHERE; THERMODYNAMICS; NUCLEATION; ABUNDANCES; NITROGEN; SURFACE; RAIN; ICE;
D O I：
10.1016/j.pss.2011.02.009
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Spectroscopic studies of the homogeneous and heterogeneous crystallization of supercooled ethane aerosol droplets performed under conditions representative of those in Titan's lower atmosphere are presented. Pure ethane aerosols and both internally- and externally-mixed ensembles of ethane/acetylene and ethane/carbon dioxide aerosols were generated in a bath gas cooling cell and their freezing dynamics monitored using infrared absorption spectroscopy. A detailed overview of the spectroscopic signatures of pure ethane and mixed ethane/acetylene and ethane/carbon dioxide aerosols and their phase-dependence is provided. The ice-nucleating efficiencies of acetylene and carbon dioxide aerosols were compared, as were the efficiencies of freezing via an immersion or contact freezing mechanism. The spectral data provided will be of significant use for remote sensing applications, while the nucleation studies have important consequences for models of Titan's ethane clouds. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：722 / 732
页数：11
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