Transverse Aeolian Ridge Growth Mechanisms and Pattern Evolution in Scandia Cavi, Mars
نویسندگان
چکیده
In Scandia Cavi on Mars, barchans migrating over a field of transverse aeolian ridges (TARs) leave behind distinctive trails (“wakes”) comprising both TARs undergoing exhumation and coarse-grained ripples being shed from the barchans. With distance upwind barchans, combined pattern these bedforms coarsens defect density decreases, thus appearing to mature with exposure time. We present results morphological analyses wake bedform crestlines using HiRISE images, seeking determine how reflects TAR growth development. interact each other, exhibiting repulsions possible lobe extensions, indicating that have migrated in past, despite lack identifiable change overlapping images spanning 9.5 years. Mapping one detail, we found is not affected by superposing ripples. However, undergo many interactions, first another, later (with upwind) underlying TARs. Near dune, laterally link, growing length, they preferentially form along crests, resulting small longer Most will be consumed TARs, an as-yet unreported dynamic for consistent work others, who continuum between meter-scale dunes. Constructing DTM, orthorectifying measuring dune migration rates places timescale ripple absorption at several thousand years, ?1,000 years dominated lateral linking Assuming accomplished entirely through burial subsequent consumption, estimate lower limit age extension, field, ?270 kyr.
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ژورنال
عنوان ژورنال: Frontiers in Earth Science
سال: 2021
ISSN: ['2296-6463']
DOI: https://doi.org/10.3389/feart.2020.619704