Journal
ICARUS
Volume 338, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.icarus.2019.113497
Keywords
Mars; Mars atmosphere; Mars surface; Radiative transfer
Categories
Funding
- Natural Science and Engineering Research Council (NSERC) of Canada's Collaborative Research and Training Experience Program (CREATE) for Technology for Exo-planetary Sciences (TEPS)
- Natural Sciences and Engineering Research Council of Canada (NSERC) [436252-2013]
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Preferred orientations of cracks in surface clasts have been reported on Earth and on Mars. This paper uses a 2D radiative transfer algorithm to simulate the Martian atmosphere, in combination with an original geometric code to determine the levels of differential insolation received by cracks as a function of season, latitude, and crack morphology on the surface of Mars. We find significant variation in preferred orientation both as a function of latitude and relative crack depth. Crack shape has little effect on the overall preferred orientation. The effect of requiring a minimum energy threshold to mobilize water is found to also affect the preferred direction, suppressing the E-W direction and somewhat promoting cross-modes. Crack orientations observed along the Spirit traverse can only be recreated by restricting growth propagation to mornings in the local autumn/winter season.
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