Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 722-732 |
| Number of pages | 11 |
| Journal | Planetary and space science |
| Volume | 59 |
| Issue number | 8 |
| Early online date | 21 Feb 2011 |
| DOIs | |
| Publication status | Published - Jun 2011 |
Keywords
- Titan
- Aerosol
- Ethane
- Infrared spectroscopy
- Nucleation
- Freezing mechanism