Billion-year trends in the aridity of river-forming climates on Mars

Kite, Edwin S.

doi:10.5194/epsc2021-345

2024

DOI: 10.5194/epsc2021-345

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Billion-year trends in the aridity of river-forming climates on Mars

Edwin S. Kite

Abstract: Summary. We analyzed a global database of constraints on Mars paleolake size relative to topographic catchment area (aridity index) and found evidence for climate zonation during the late-stage river-forming climates. Aridity increased over time in southern midlatitudes, but wetter climates (semiarid to arid) persisted near the equator and in the northern midlatitudes.&#160; <p&am… Show more

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The Timing of Alluvial Fan Formation on Mars

Holo¹,

Kite²,

Wilson³

et al. 2021

Planet. Sci. J.

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The history of rivers on Mars is an important constraint on Martian climate evolution. The timing of relatively young, alluvial fan-forming rivers is especially important, as Mars’s Amazonian atmosphere is thought to have been too thin to consistently support surface liquid water. Previous regional studies suggested that alluvial fans formed primarily between the Early Hesperian and the Early Amazonian. In this study, we describe how a combination of a global impact crater database, a global geologic map, a global alluvial fan database, and statistical models can be used to estimate the timing of alluvial fan formation across Mars. Using our global approach and improved statistical modeling, we find that alluvial fan formation likely persisted into the last ∼2.5 Gyr, well into the Amazonian period. However, the data we analyzed were insufficient to place constraints on the duration of alluvial fan formation. Going forward, more crater data will enable tighter constraints on the parameters estimated in our models and thus further inform our understanding of Mars’s climate evolution.

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The Timing of Alluvial Fan Formation on Mars

Holo¹,

Kite²,

Wilson³

et al. 2021

Planet. Sci. J.

View full text Add to dashboard Cite

show abstract

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Billion-year trends in the aridity of river-forming climates on Mars

Cited by 1 publication

References 38 publications

The Timing of Alluvial Fan Formation on Mars

The Timing of Alluvial Fan Formation on Mars

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