Widespread Megaripple Activity Across the North Polar Ergs of Mars

Chojnacki, M.; Vaz, D. A.; Silvestro, S.; Silva, David C. A.

doi:10.1029/2021je006970

Cited by 17 publications

(9 citation statements)

References 84 publications

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“…Coarse grain displacement and megaripple migrations are reported for the first time by two papers in this collection Silvestro et al, 2020). The hypothesized relationship between dune and megaripple fluxes seem to point toward an impact-driven creep process of movement for the coarse grain fraction, though this hypothesis needs to be properly tested elsewhere on Mars (Chojnacki et al, 2021). A better knowledge of where and when coarse sediment is displaced will be helpful to correctly understand atmospheric model output and interpret the sedimentary record of Mars (and of Titan in the future) Barnes et al, 2021).…”

Section: Discussionmentioning

confidence: 87%

“…Three new missions to Venus; NASA's VERITAS and DAVINCI and ESA's EnVision missions will reignite process of the unmasking of Venusian dunes (Titus et al, 2021). Terrestrial fieldwork aiming to constrain different bedform flux proportions will be helpful to correctly scale Martian observations to formative processes (Chojnacki et al, 2021;Silvestro et al, 2020). The analysis of aeolian bedforms on Titan and Mars is a topic that has both geological and astrobiological implications.…”

Section: Discussionmentioning

confidence: 99%

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Planetary Aeolian Landforms: An Introduction to the Fifth Planetary Dunes Workshop Special Issue

Silvestro

Titus

2022

JGR Planets

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Aeolian landforms are widespread in our solar system. Understanding the exact nature and processes of formation of these features are challenging tasks necessitating a strong collaboration between scientists with different skills and scientific backgrounds. This paper describes the special issue for the 5th International Planetary Dunes Workshop, which includes 15 research papers and three commentaries. Among the 18 papers included in this collection, 16 cover Martian aeolian science and two Titan aeolian science. The papers presented focus on bedform morphology and dynamics via remote sensing data, modeling, analogs studies and laboratory experiments. Here we put the main results of the papers in their appropriate scientific context and discuss potential future lines of research.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Planetary Aeolian Landforms: An Introduction to the Fifth Planetary Dunes Workshop Special Issue

Silvestro

Titus

2022

JGR Planets

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“…COSI-Corr allows sand ripple migration to be quantified with a precision of ∼1/3 of an HiRISE pixel (∼8 cm) using precise registration and cross-correlation between images [5]. Additional studies using HiRISE DTMs, orthoimages, and seasonal images have further applied COSI-Corr's automatic co-registration to examine seasonal trends in ripple migration and, indirectly, local winds [83][84][85].…”

Section: Aeolian Studiesmentioning

confidence: 99%

“…Figure S2: Animation_2_Dunes.gif: An animated 3-step sequence of high flux ripples, megaripples, and dunes adjacent to the north polar cap boundary (83.99 • N, 233.22 • E) using HiRISE orthoimages. See for [85,161] for additional discussion. Sun symbol shows illumination direction for each frame.…”

Section: Supplementary Materialsmentioning

confidence: 99%

“…used long-baseline (4-5 Mars years) orthoimage pairs to show that TARs in Nili Fossae and within McLaughlin crater, with spacings of ∼1-35 m and heights of 0.8-2 m, are active today. More recently a systematic survey using long-baseline (4-7 Mars years) orthoimages found highly active megaripples at numerous locations within the north polar erg[85], challenging the previously held view that these landforms were last active during a past climate period with a thicker atmosphere[92][93][94][95].…”

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confidence: 92%

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Revealing Active Mars with HiRISE Digital Terrain Models

et al. 2022

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Many discoveries of active surface processes on Mars have been made due to the availability of repeat high-resolution images from the High Resolution Imaging Science Experiment (HiRISE) onboard the Mars Reconnaissance Orbiter. HiRISE stereo images are used to make digital terrain models (DTMs) and orthorectified images (orthoimages). HiRISE DTMs and orthoimage time series have been crucial for advancing the study of active processes such as recurring slope lineae, dune migration, gully activity, and polar processes. We describe the process of making HiRISE DTMs, orthoimage time series, DTM mosaics, and the difference of DTMs, specifically using the ISIS/SOCET Set workflow. HiRISE DTMs are produced at a 1 and 2 m ground sample distance, with a corresponding estimated vertical precision of tens of cm and ∼1 m, respectively. To date, more than 6000 stereo pairs have been acquired by HiRISE and, of these, more than 800 DTMs and 2700 orthoimages have been produced and made available to the public via the Planetary Data System. The intended audiences of this paper are producers, as well as users, of HiRISE DTMs and orthoimages. We discuss the factors that determine the effective resolution, as well as the quality, precision, and accuracy of HiRISE DTMs, and provide examples of their use in time series analyses of active surface processes on Mars.

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Seasonal and Short Timescale Changes on the Martian Surface: Multi-Spacecraft Perspectives

Thomas,

Pommerol,

Hauber

et al. 2024

Space Sci Rev

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The continued operation of missions such as Mars Express, Mars Reconnaissance Orbiter, and the ExoMars Trace Gas Orbiter has greatly enhanced our knowledge of seasonal processes on Mars. The most apparent evidence of the importance of seasons on Mars on the large scale is annual variation in the sizes of the Martian polar caps. However, high resolution imaging has also shown that seasonal forcing can lead to small-scale phenomena that are continuously changing the topography and the surface photometry. These phenomena often have no terrestrial analogue and involve complex interactions between seasonal ices, atmosphere, and substrate (surface and sub-surface). Although we now have better understanding of many of these processes (occasionally as a result of laboratory simulation), direct proof of some hypotheses remains elusive. We provide a brief review of the phenomena and list a series of open questions.

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Widespread Megaripple Activity Across the North Polar Ergs of Mars

Cited by 17 publications

References 84 publications

Planetary Aeolian Landforms: An Introduction to the Fifth Planetary Dunes Workshop Special Issue

Planetary Aeolian Landforms: An Introduction to the Fifth Planetary Dunes Workshop Special Issue

Revealing Active Mars with HiRISE Digital Terrain Models

Seasonal and Short Timescale Changes on the Martian Surface: Multi-Spacecraft Perspectives

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