Laboratory investigations of the physical state of CO 2 ice in a simulated Martian environment

Portyankina, G.; Merrison, J.; Iversen, J.J.; Yoldi Martínez de Mandojana, Zuriñe; Hansen, C.J.; Aye, K.-M.; Pommerol, Antoine; Thomas, Nicolas (2019). Laboratory investigations of the physical state of CO 2 ice in a simulated Martian environment. Icarus, 322, pp. 210-220. Elsevier 10.1016/j.icarus.2018.04.021

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We have experimentally investigated CO 2 ice condensation under conditions similar to those expected in the Martian polar areas using the Environmental Wind Tunnel of Aarhus University in the framework of Trans-National Access opportunities within the EuroPlanet Research Infrastructure. Our goal was to condense CO 2 directly from the chamber’s atmosphere onto a specially designed cooling plate. We inves- tigated ranges of temperatures and pressures similar to those in Martian polar areas, observed the texture of the created CO 2 ice layer, and measured its optical properties. Most importantly, we find that under conditions usual for Martian polar areas in fall and winter, CO 2 ice always deposits as a translucent slab. The maximum thickness of the ice that we have achieved approached 2 cm and this CO 2 slab ice layer was either transparent or highly translucent. Under significantly lower temperatures or in states away from equilibrium (for example, when CO 2 gas input into the chamber was fast and created over-pressure) CO 2 deposited as different crystalline structures. In this case, when a thick layer was created, it was not visually transparent. However, even in those cases it still retains some level of translucency. Our results will advance the analysis of remote-sensing data related to CO 2 ice, Mars’ seasonal cycles, and various models considering CO 2 ice condensation-sublimation related processes.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Yoldi Martínez de Mandojana, Zuriñe; Pommerol, Antoine and Thomas, Nicolas

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering

ISSN:

0019-1035

Publisher:

Elsevier

Language:

English

Submitter:

Dora Ursula Zimmerer

Date Deposited:

04 Jul 2018 14:52

Last Modified:

22 Mar 2019 11:31

Publisher DOI:

10.1016/j.icarus.2018.04.021

BORIS DOI:

10.7892/boris.118276

URI:

https://boris.unibe.ch/id/eprint/118276

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