Ice nucleation by surrogates of Martian mineral dust: What can we learn about Mars without leaving Earth?
Article first published online: 23 SEP 2013
©2013. American Geophysical Union. All Rights Reserved.
Journal of Geophysical Research: Planets
Volume 118, Issue 9, pages 1945–1954, September 2013
How to Cite
2013), Ice nucleation by surrogates of Martian mineral dust: What can we learn about Mars without leaving Earth?, J. Geophys. Res. Planets, 118, 1945–1954, doi:10.1002/jgre.20155., , , , , , , , and (
- Issue published online: 11 OCT 2013
- Article first published online: 23 SEP 2013
- Accepted manuscript online: 11 SEP 2013 03:20PM EST
- Manuscript Accepted: 7 SEP 2013
- Manuscript Revised: 30 AUG 2013
- Manuscript Received: 11 JUN 2013
- DFG HALO. Grant Number: MOEH 668/1-2
- Martian clouds;
- ice nucleation
 Water and carbon dioxide ice clouds have been observed in the Martian atmosphere where they are dynamic parts of that planet's water and carbon cycles. Many Martian atmospheric models struggle to correctly predict clouds and, with insufficient data, some use untested simplifications that cloud formation occurs exactly at the saturation point of the condensed phase or at the same conditions as terrestrial cirrus clouds. To address the lack of data, we have utilized an 84 m3 cloud chamber built for studies of high altitude cirrus and polar stratospheric ice clouds in the Earth's atmosphere and adapted to Martian conditions. Using this chamber, we have been able to produce water ice clouds from aerosol in an inert and low pressure atmosphere mimicking that of Mars. At temperatures between 189 and 215 K, we investigated cloud formation by mineral dust particulates of a similar composition and size to those found on Mars. We show that these surrogate materials nucleate effectively at the higher temperatures, with minor temperature dependence at saturations ratios with respect to the ice phase of ~1.1, similar to what has been found for terrestrial cirrus. At the lower end of the temperature range, this saturation rises to ~1.9, a result consistent with previous studies.