{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,3,16]],"date-time":"2025-03-16T04:02:11Z","timestamp":1742097731842,"version":"3.38.0"},"posted":{"date-parts":[[2025,3,15]]},"group-title":"oral","reference-count":0,"publisher":"Copernicus GmbH","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"The ESA ExoMars mission will land at Oxia Planum to search for signs of life on Mars [1, 2]. In this study, we compare automated and manual mapping of aeolian features in CTX (6 m\/pixel), CaSSIS (5 m\/pixel), and HiRISE (25 cm\/pixel) images in the landing site with potential sand fluxes from the NASA Ames GCM. Bright-toned wind streaks (n = 85) were manually mapped and were formed by winds originating from the NNW&#8211;NNE, the return flows of the Hadley cell circulation. A few dark-toned streaks (n = 2), formed by winds from the E&#8211;ESE, were also identified. Bright bedforms (trasverse aeolian ridges [TARs]) were automatically mapped. They are widespread [3, 4] and exhibit dark banding on their SE-facing slopes [4] which might be caused by aeolian sorting of loose sands with varying granulometry and\/or composition. Ridges (periodic bedrock ridges [PBRs]) were automatically mapped as well. Together with the PBRs we identified a potentially new class of WNW&#8211;ESE-oriented cratered ridges (&#8220;ridges 2&#8221;). These features, located inside degraded impact craters, display Y-junctions and may be locally covered by boulders from nearby impacts [4]. However, unlike PBRs, they do not appear to be directly carved into the underlying bedrock. The orientations of wind streaks in the study area suggest at least two wind regimes at play. Interestingly, a bimodal sand flux direction is also predicted by the GCM, with one mode (~172&#176;&#8211;188&#176;) closely matching the observed bright-toned wind streak orientations. Bright bedforms (TARs) are likely relict features shaped by past wind conditions [3-5]. This is supported by the GCM-predicted bedform orientation, which does not align with either the observed TARs&#8217; orientation or that of the older periodic bedrock ridges (PBRs) [3-5]. The newly identified &#8220;ridge 2&#8221; class of landform has previously been interpreted as precursor bedforms that initiated the formation of the underlying PBRs [4]. However, the ridge 2 class can be found even on a flat bedrock surface not in association with PBRs. This observation suggests that these features may represent a later episode of aeolian deposition or erosion, occurring after the formation of the PBRs [4]. The morphology of the &#8220;ridge 2&#8221; class varies across the study area, with some ridges appearing subdued and eroded. A ghost-dune pit origin [6] or an erosional-scarf\/bedform assemblage, similar to observations at Meridiani Planum [7], cannot be ruled out.Detailed examination of the relationships among ridges, PBRs, and TARs by the ESA Rosalind Franklin rover will be crucial for advancing our understanding of PBR formation mechanisms, the winds responsible for shaping TARs, and broader Martian climatic changes.[1] Vago J. et al. (2017). Astrobiology, 17. [2] Quantin et al. (2021), Astrobiology, 21. [3] Silvestro S. et al. (2021), GRL, 48. [4] Favaro E. et al. (2021), JGR, 126. [5] Favaro E. et al. (2024), EPSL, 626. [6] Day M.D. &amp; Catling D.C. (2018), JGR, 123. [7] Fenton L.K. et al. (2018), JGR, 123, 1&#8211;15.<\/jats:p>","DOI":"10.5194\/egusphere-egu25-15981","type":"posted-content","created":{"date-parts":[[2025,3,15]],"date-time":"2025-03-15T03:19:02Z","timestamp":1742008742000},"source":"Crossref","is-referenced-by-count":0,"title":["Aeolian Landforms in the EXOMARS 2028 Landing Site in Oxia Planum (Mars)"],"prefix":"10.5194","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3196-6620","authenticated-orcid":false,"given":"Simone","family":"Silvestro","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3583-2267","authenticated-orcid":false,"given":"David Alegre","family":"Vaz","sequence":"additional","affiliation":[]},{"given":"Fabio Massimo","family":"Grasso","sequence":"additional","affiliation":[]},{"given":"Lori","family":"Fenton","sequence":"additional","affiliation":[]},{"given":"Rafael","family":"Cardoso","sequence":"additional","affiliation":[]},{"given":"Andrea","family":"Pacifici","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5905-5426","authenticated-orcid":false,"given":"Daniela","family":"Tirsch","sequence":"additional","affiliation":[]},{"given":"Elena","family":"Favaro","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9170-6655","authenticated-orcid":false,"given":"Yu","family":"Tao","sequence":"additional","affiliation":[]},{"given":"Francesco","family":"Salese","sequence":"additional","affiliation":[]},{"given":"Gabriele","family":"Franzese","sequence":"additional","affiliation":[]},{"given":"Ciprian","family":"Popa","sequence":"additional","affiliation":[]},{"given":"Giuseppe","family":"Mongelluzzo","sequence":"additional","affiliation":[]},{"given":"Carmen","family":"Porto","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3144-1277","authenticated-orcid":false,"given":"Maurizio","family":"Pajola","sequence":"additional","affiliation":[]},{"given":"Umberto","family":"Rizza","sequence":"additional","affiliation":[]},{"given":"Francesca","family":"Esposito","sequence":"additional","affiliation":[]}],"member":"3145","container-title":[],"original-title":[],"deposited":{"date-parts":[[2025,3,15]],"date-time":"2025-03-15T03:47:15Z","timestamp":1742010435000},"score":1,"resource":{"primary":{"URL":"https:\/\/meetingorganizer.copernicus.org\/EGU25\/EGU25-15981.html"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,3,15]]},"references-count":0,"URL":"https:\/\/doi.org\/10.5194\/egusphere-egu25-15981","relation":{},"subject":[],"published":{"date-parts":[[2025,3,15]]},"subtype":"other"}}