The formation of araneiforms by carbon dioxide venting and vigorous sublimation dynamics under martian atmospheric pressure

Abstract The local redistribution of granular material by sublimation of the southern seasonal $${\hbox {CO}}_2$$ CO 2 ice deposit is one of the most active surface shaping processes on Mars today. This unique geomorphic mechanism is hypothesised to be the cause of the dendritic, branching, spider-l...

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Autores principales:	Lauren Mc Keown, J. N. McElwaine, M. C. Bourke, M. E. Sylvest, M. R. Patel
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c192524f799d4aaeb4b51cf408a1a89e
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spelling	oai:doaj.org-article:c192524f799d4aaeb4b51cf408a1a89e2021-12-02T11:39:47ZThe formation of araneiforms by carbon dioxide venting and vigorous sublimation dynamics under martian atmospheric pressure10.1038/s41598-021-82763-72045-2322https://doaj.org/article/c192524f799d4aaeb4b51cf408a1a89e2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-82763-7https://doaj.org/toc/2045-2322Abstract The local redistribution of granular material by sublimation of the southern seasonal $${\hbox {CO}}_2$$ CO 2 ice deposit is one of the most active surface shaping processes on Mars today. This unique geomorphic mechanism is hypothesised to be the cause of the dendritic, branching, spider-like araneiform terrain and associated fans and spots—features which are native to Mars and have no Earth analogues. However, there is a paucity of empirical data to test the validity of this hypothesis. Additionally, it is unclear whether some araneiform patterns began as radial and then grew outward, or whether troughs connected at mutual centres over time. Here we present the results of a suite of laboratory experiments undertaken to investigate if the interaction between a sublimating $${\hbox {CO}}_2$$ CO 2 ice overburden containing central vents and a porous, mobile regolith will mobilise grains from beneath the ice in the form of a plume to generate araneiform patterns. We quantify the branching and area of the dendritic features that form. We provide the first observations of plume activity via $${\hbox {CO}}_2$$ CO 2 sublimation and consequent erosion to form araneiform features. We show that $${\hbox {CO}}_2$$ CO 2 sublimation can be a highly efficient agent of sediment transport under present day Martian atmospheric pressure and that morphometry is governed by the Shields parameter.Lauren Mc KeownJ. N. McElwaineM. C. BourkeM. E. SylvestM. R. PatelNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Lauren Mc Keown J. N. McElwaine M. C. Bourke M. E. Sylvest M. R. Patel The formation of araneiforms by carbon dioxide venting and vigorous sublimation dynamics under martian atmospheric pressure
description	Abstract The local redistribution of granular material by sublimation of the southern seasonal $${\hbox {CO}}_2$$ CO 2 ice deposit is one of the most active surface shaping processes on Mars today. This unique geomorphic mechanism is hypothesised to be the cause of the dendritic, branching, spider-like araneiform terrain and associated fans and spots—features which are native to Mars and have no Earth analogues. However, there is a paucity of empirical data to test the validity of this hypothesis. Additionally, it is unclear whether some araneiform patterns began as radial and then grew outward, or whether troughs connected at mutual centres over time. Here we present the results of a suite of laboratory experiments undertaken to investigate if the interaction between a sublimating $${\hbox {CO}}_2$$ CO 2 ice overburden containing central vents and a porous, mobile regolith will mobilise grains from beneath the ice in the form of a plume to generate araneiform patterns. We quantify the branching and area of the dendritic features that form. We provide the first observations of plume activity via $${\hbox {CO}}_2$$ CO 2 sublimation and consequent erosion to form araneiform features. We show that $${\hbox {CO}}_2$$ CO 2 sublimation can be a highly efficient agent of sediment transport under present day Martian atmospheric pressure and that morphometry is governed by the Shields parameter.
format	article
author	Lauren Mc Keown J. N. McElwaine M. C. Bourke M. E. Sylvest M. R. Patel
author_facet	Lauren Mc Keown J. N. McElwaine M. C. Bourke M. E. Sylvest M. R. Patel
author_sort	Lauren Mc Keown
title	The formation of araneiforms by carbon dioxide venting and vigorous sublimation dynamics under martian atmospheric pressure
title_short	The formation of araneiforms by carbon dioxide venting and vigorous sublimation dynamics under martian atmospheric pressure
title_full	The formation of araneiforms by carbon dioxide venting and vigorous sublimation dynamics under martian atmospheric pressure
title_fullStr	The formation of araneiforms by carbon dioxide venting and vigorous sublimation dynamics under martian atmospheric pressure
title_full_unstemmed	The formation of araneiforms by carbon dioxide venting and vigorous sublimation dynamics under martian atmospheric pressure
title_sort	formation of araneiforms by carbon dioxide venting and vigorous sublimation dynamics under martian atmospheric pressure
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c192524f799d4aaeb4b51cf408a1a89e
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The formation of araneiforms by carbon dioxide venting and vigorous sublimation dynamics under martian atmospheric pressure

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