Releasing Atmospheric Martian Dust in Sand Grain Impacts

DOI: 
10.3847/PSJ/ac8477
Publication date: 
08/08/2022
Main author: 
Becker, T.
IAA authors: 
Muñoz, O.;Martikainen, J.;Martin, J. C. Gomez
Authors: 
Becker, T.;Teiser, J.;Jardiel, T.;Peiteado, M.;Muñoz, O.;Martikainen, J.;Martin, J. C. Gomez;Wurm, G.
Journal: 
The Planetary Science Journal
Refereed: 
Yes
Publication type: 
Article
Volume: 
3
Pages: 
195
Abstract: 
Emission of dust up to a few microns in size by impacts of sand grains during saltation is thought to be one source of dust within the Martian atmosphere. To study this dust fraction, we carried out laboratory impact experiments. Small numbers of particles of about 200 μm in diameter impacted a simulated Martian soil (bimodal Mars Global Simulant). Impacts occurred at angles of ~18° in vacuum with an impact speed of ~1 m s<SUP>-1</SUP>. Ejected dust was captured on adjacent microscope slides and the emitted particle size distribution (PSD) was found to be related to the soil PSD. We find that the ejection of clay-sized dust gets increasingly harder the smaller these grains are. However, in spite of strong cohesive forces, individual impacts emit dust of 1 μm and less, i.e., dust in the size range that can be suspended in the Martian atmosphere. More generally, the probability of ejecting dust of a given size can be characterized by a power law in the size range between 0.5 and 5 μm (diameter).
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2022PSJ.....3..195B/abstract
ADS Bibcode: 
2022PSJ.....3..195B
Keywords: 
Mars;Exoplanet atmospheres;1007;487;Astrophysics - Earth and Planetary Astrophysics