The fault in our TARs: A critical review of research paradigms for intermediate‐scale bedforms on Mars DOI
Tyler Gough, Thomas E. Barchyn,

Chris H. Hugenholtz

et al.

Earth Surface Processes and Landforms, Journal Year: 2023, Volume and Issue: 49(1), P. 236 - 255

Published: Dec. 21, 2023

Abstract We provide a critical review of research paradigms for classifying intermediate‐scale aeolian bedforms on Mars and the new terminology that has emerged. The systematic classification always been challenging debated, no paradigmatic knowledge organization system exists beyond general agreement importance distinction between ripples dunes. diverse landscapes have introduced further topics challenges to these debates. argue Martian geomorphology's is preparadigmatic consensus over their definitions not established in literature. A science can be functional only if scientists operating discipline precise, falsifiable or use abductive logic. Drawing evidence examples from literature, we replacement conventional paradigm used bedform with inductive logic created an emerging disciplinary based scientific hesitancy dependence complex structures, epitomized by concepts ‘transverse ridges’ (TARs) ‘large ripples’ (LMRs). show TAR and, increasingly, LMR are constructs popularized despite them causing significant confusion. Notably, highlight how terms irreconcilably as both class non‐genetic placeholder term bedforms. Suggestions moving need provided, focusing return more direct local hypothesis‐driven inspired W.M. Davis's notion outrageous geological hypotheses. Recent debate surrounding Gale crater presented example productivity such approach, it recommended longer used.

Language: Английский

Polar science results from Mars Reconnaissance Orbiter: Multiwavelength, multiyear insights DOI
M. E. Landis, Pruthviraj J. Acharya, N. Alsaeed

et al.

Icarus, Journal Year: 2023, Volume and Issue: 419, P. 115794 - 115794

Published: Sept. 13, 2023

Language: Английский

Citations

6
A comparison of CO2 seasonal activity in Mars' northern and southern hemispheres DOI Creative Commons
C. J. Hansen, Shane Byrne, W. M. Calvin

et al.

Icarus, Journal Year: 2023, Volume and Issue: 419, P. 115801 - 115801

Published: Sept. 19, 2023

Carbon dioxide is Mars' most active volatile. The seasonal and diurnal processes of when where it condenses sublimates are determined by energy balance between the atmosphere surface ice in vapor pressure equilibrium climate. current obliquity ensures that polar caps stable locations for condensation. eccentricity orbit major driver differences behavior CO2 northern vs southern hemisphere. In particular, seasons perihelion aphelion, addition to large elevation difference poles, dominate ways transpire two hemispheres. We summarize discuss unprecedented observations these have been collected Mars Reconnaissance Orbiter over last 8.5 Years. longer fall winter allows more time accumulate densify Northern coincides with dust storm season, thus north deposits expected contain a greater concentration relation H2O ices. With less densification contaminants layer likely weaker than layer.

Language: Английский

Citations

4
A Lab-scale Investigation of the Mars Kieffer Model DOI Creative Commons
Lauren Mc Keown, Michael J. Poston, S. Diniega

et al.

The Planetary Science Journal, Journal Year: 2024, Volume and Issue: 5(9), P. 195 - 195

Published: Sept. 1, 2024

Abstract The Kieffer model is a widely accepted explanation for seasonal modification of the Martian surface by CO 2 ice sublimation and formation “zoo” intriguing features. However, lack in situ observations empirical laboratory measurements winter conditions hampers validation refinement. We present first experiments to investigate all three main stages within single experiment: (i) condensation on thick layer Mars regolith simulant; (ii) plume, spot, halo formation; (iii) resultant find that full supported scale as diffuses into pore spaces forms thin overlying conformal translucent ice. When buried heater activated, plume dark spot develop dust ejected with pressurized gas, falling creates bright halo. During activity, thermal stress cracks form network similar morphology certain types spiders, dendritic troughs, furrows, patterned ground high south polar latitudes. These appear owing substrate, instead scouring. discuss potential this process be an alternative mechanism “cracked” spider-like morphologies Mars. Leveraging our observations, we also provide guidance future or investigations model.

Language: Английский

Citations

1
Thickness of the Seasonal Deposits at the Martian North Polar Region From Shadow Variations of Fallen Ice Blocks DOI Creative Commons
Haifeng Xiao, Yuchi Xiao, Shu Su

et al.

Journal of Geophysical Research Planets, Journal Year: 2024, Volume and Issue: 129(4)

Published: April 1, 2024

Abstract The seasonal deposition and sublimation of CO 2 constitute a major element in the Martian volatile cycle. Here, we propose to use shadow variations ice blocks at foot steep scarps North Polar Layered Deposits (NPLD) infer vertical evolution deposits. We conduct an experiment scarp centered (85.0°N, 151.5°E). assume that no snowfall remains on top selected blocks, frost layer is homogeneous around their surroundings, significant moating present. show average thickness deposits due snowfalls Mars Year 31 0.97 ± 0.13 m Ls = 350.7° late winter. large depth measured makes us wonder if are more frequent violent than previously thought. Meanwhile, reaches 0.64 0.18 Combined, total cover 1.63 0.22 winter, continuously decreases 0.45 0.06 42.8° middle spring 0.05 69.6° spring. These estimates up 0.8 lower existing Orbiter Laser Altimeter results during observe snow very early 36 can be 0.36 thicker 31. This study demonstrates dynamics climate emphasizes importance its long‐term monitoring.

Language: Английский

Citations

1
Observations of North Polar Region of Mars from the Mars Colour Camera Onboard Indian Mars Orbiter Mission DOI
R. Singh,

Prakash Chauhan

Journal of the Indian Society of Remote Sensing, Journal Year: 2023, Volume and Issue: 51(8), P. 1825 - 1840

Published: Aug. 1, 2023

Language: Английский

Citations

0
Are seasonal deposits in spring at the Martian North Pole much shallower than previously thought? DOI Open Access
Haifeng Xiao, Yuchi Xiao, Shu Su

et al.

Authorea (Authorea), Journal Year: 2023, Volume and Issue: unknown

Published: Sept. 11, 2023

The seasonal deposition and sublimation of CO constitute a major element in the Martian volatile cycle. Here, we propose to use shadow variations ice blocks at foot steep scarps North Polar Layered Deposits (NPLDs) infer vertical evolution deposits high polar latitudes. We conduct an experiment scarp centered (85.0°N, 151.5°E). show that average thickness due snowfalls Mars Year 31 is 0.97±0.13 m Ls = 350.7° late winter, which then gradually decreases springtime. large snow depth measured makes us wonder if are more frequent violent than previously thought. Meanwhile, frost direct condensation reaches 0.64±0.18 winter quasi-linearly towards summer solstice. Combined, total cover 1.63±0.22 continuously 0.45±0.06 42.8° middle spring 0.06±0.05 69.6° spring. These estimates up 0.8 lower existing MOLA results during spring, can be mainly attributed MOLA-related biases. In terms interannual variations, observe very early 36 0.36±0.13 deeper 31.

Language: Английский

Citations

0
The fault in our TARs: A critical review of research paradigms for intermediate‐scale bedforms on Mars DOI
Tyler Gough, Thomas E. Barchyn,

Chris H. Hugenholtz

et al.

Earth Surface Processes and Landforms, Journal Year: 2023, Volume and Issue: 49(1), P. 236 - 255

Published: Dec. 21, 2023

Abstract We provide a critical review of research paradigms for classifying intermediate‐scale aeolian bedforms on Mars and the new terminology that has emerged. The systematic classification always been challenging debated, no paradigmatic knowledge organization system exists beyond general agreement importance distinction between ripples dunes. diverse landscapes have introduced further topics challenges to these debates. argue Martian geomorphology's is preparadigmatic consensus over their definitions not established in literature. A science can be functional only if scientists operating discipline precise, falsifiable or use abductive logic. Drawing evidence examples from literature, we replacement conventional paradigm used bedform with inductive logic created an emerging disciplinary based scientific hesitancy dependence complex structures, epitomized by concepts ‘transverse ridges’ (TARs) ‘large ripples’ (LMRs). show TAR and, increasingly, LMR are constructs popularized despite them causing significant confusion. Notably, highlight how terms irreconcilably as both class non‐genetic placeholder term bedforms. Suggestions moving need provided, focusing return more direct local hypothesis‐driven inspired W.M. Davis's notion outrageous geological hypotheses. Recent debate surrounding Gale crater presented example productivity such approach, it recommended longer used.

Language: Английский

Citations

0