Quantified Aeolian Dune Changes on Mars Derived From Repeat Context Camera Images
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Issue date
2019-12-11Submitted date
2019-12-22Subject Terms
Sand dunesAeolian systems
Mars
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Show full item recordAbstract
Aeolian systems are active across much of the surface of Mars and quantifying the activity of bedforms is important for understanding the modern and recent Martian environment. Recently, the migration rates and sand fluxes of dunes and ripples have been precisely measured using repeat High Resolution Imaging Science Experiment (HiRISE) images. However, the limited areal extent of HiRISE coverage means that only a small area can be targeted for repeat coverage. Context Camera (CTX) images, although lower in spatial resolution, have wider spatial coverage, meaning that dune migration can potentially be monitored over larger areas. We used time series, coregistered CTX images and digital elevation models to measure dune migration rates and sand fluxes at six sites: Nili Patera, Meroe Patera, two sites at Herschel crater, McLaughlin crater, and Hellespontus Montes. We observed dune displacement in the CTX images over long‐term baselines (7.5–11 Earth years; 4–6 Mars years). Bedform activity has previously been measured at all these sites using HiRISE, which we used to validate our results. Our dune migration rates (0.2–1.1 m/EY) and sand fluxes (2.4–11.6 m3 m−1 EY−1) compare well to measurements made with HiRISE. The use of CTX in monitoring dune migration has advantages (wider spatial coverage, faster processing time) and disadvantages (ripples not resolved, digital elevation model dune heights may be underestimates); the future combined use of HiRISE and CTX is likely to be beneficial.Citation
Davis, J. M., Grindrod, P. M., Boazman, S. J., Vermeesch, P., & Baird, T. (2020). Quantified Aeolian dune changes on Mars derived from repeat context camera images. Earth and Space Science, 7, e2019EA000874Publisher
American Geophysical Union (AGU)Journal
Earth and Space ScienceType
Journal ArticleItem Description
©2019. American Geophysical Union. All Rights Reserved. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.ISSN
2333-5084EISSN
2333-5084ae974a485f413a2113503eed53cd6c53
10.1029/2019ea000874
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