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Repeat orbital imaging shows crescentic, transverse, and star dunes across the Hellespontus Montes region migrate, converge, and occasionally reverse course. Dune morphology and sand ripple migration identify three effective wind regimes that vary spatially and temporally, correlating with atmospheric modeling. Peak sand transport occurs during southern spring and summer to the west and southwest, driven by daytime anabatic slope winds originating from Hellas. Migration rates decline with waning temperatures, when eastward drainage winds into Hellas dominate nights annually and during the colder seasons. However, these diurnally and seasonally cyclic slope winds can be highly localized, as nearby barchan fields swiftly migrate exclusively west where eastward winds are mitigated by topography. These novel findings highlight the complexity of surface\u2010atmosphere interactions in shaping aeolian systems on Mars.<\/jats:p>","DOI":"10.1029\/2024gl114583","type":"journal-article","created":{"date-parts":[[2025,6,18]],"date-time":"2025-06-18T08:40:47Z","timestamp":1750236047000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Multidirectional Dune Dynamics Under Seasonal Winds on Mars"],"prefix":"10.1029","volume":"52","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8497-8994","authenticated-orcid":false,"given":"Matthew","family":"Chojnacki","sequence":"first","affiliation":[{"name":"Planetary Science Institute  Lakewood CO USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3583-2267","authenticated-orcid":false,"given":"David A.","family":"Vaz","sequence":"additional","affiliation":[{"name":"Centre for Earth and Space Research of the University of Coimbra Observat\u00f3rio Geof\u00edsico e Astron\u00f3mico da Universidade de Coimbra  Coimbra Portugal"},{"name":"INAF Osservatorio Astronomico di Capodimonte  Napoli Italia"}]},{"given":"Pruthviraj J.","family":"Acharya","sequence":"additional","affiliation":[{"name":"Centre for Research in Earth and Space York University  Toronto ON Canada"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3196-6620","authenticated-orcid":false,"given":"Simone","family":"Silvestro","sequence":"additional","affiliation":[{"name":"INAF Osservatorio Astronomico di Capodimonte  Napoli Italia"},{"name":"Carl Sagan Center SETI Institute  Mountain View CA USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4331-913X","authenticated-orcid":false,"given":"Isaac B.","family":"Smith","sequence":"additional","affiliation":[{"name":"Planetary Science Institute  Lakewood CO USA"},{"name":"Centre for Research in Earth and Space York University  Toronto ON Canada"}]}],"member":"13","published-online":{"date-parts":[[2025,6,18]]},"reference":[{"key":"e_1_2_8_1_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/ncomms6096"},{"key":"e_1_2_8_1_3_1","doi-asserted-by":"publisher","DOI":"10.1029\/2005JE002660"},{"key":"e_1_2_8_1_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature11022"},{"key":"e_1_2_8_1_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.aeolia.2013.02.004"},{"key":"e_1_2_8_1_6_1","doi-asserted-by":"publisher","DOI":"10.1130\/G45793.1"},{"key":"e_1_2_8_1_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.icarus.2023.115863"},{"key":"e_1_2_8_1_8_1","doi-asserted-by":"publisher","DOI":"10.1029\/2021JE006970"},{"key":"e_1_2_8_1_9_1","doi-asserted-by":"publisher","DOI":"10.1029\/2020GL088456"},{"key":"e_1_2_8_1_10_1","doi-asserted-by":"publisher","DOI":"10.1029\/2005JE002436"},{"key":"e_1_2_8_1_11_1","doi-asserted-by":"publisher","DOI":"10.1029\/2000JE001407"},{"key":"e_1_2_8_1_12_1","doi-asserted-by":"publisher","DOI":"10.1029\/2004JE002309"},{"key":"e_1_2_8_1_13_1","doi-asserted-by":"publisher","DOI":"10.1029\/1999JE001025"},{"key":"e_1_2_8_1_14_1","first-page":"137","volume-title":"Presented at the U.S. Geological Survey professional paper","author":"Fryberger S. 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