Analysis of wind-induced dynamic pressure fluctuations during one and a half Martian years at Gale Crater

Ullán, Aurora; Zorzano, María Paz; Martín-Torres, F. J.; Valentín-Serrano, P.; Kahanpää, Henrik; Harri, A. M.; Navarro, Sara

doi:10.1016/j.icarus.2017.01.020

Cited by 17 publications

(18 citation statements)

References 29 publications

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“…I can share the view that wind could be periodical (i.e. Ullán et al, 2017), even assuming preferential zones over pyroclastic deposits in which excavation may initiate, but I do not see why these same zones cannot be refilled with material transported by the wind from elsewhere. Global observation of dunes on Mars has indeed shown that 75% of the dunes are located between 70 and 85°N of latitude, but common sediment transport is towards the east and the west thus suggesting sediment source in local layered deposits (Hayward et al, 2013).…”

Section: Dike Intrusionmentioning

confidence: 93%

Mangala Valles, Mars: A reassessment of formation processes based on a new geomorphological and stratigraphic analysis of the geological units

Leone¹

2017

Journal of Volcanology and Geothermal Research

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Mangala Valles has always been viewed as the typical outflow channel formed by catastrophic floods of water. A new analysis has shown that the geomorphological traces of fluvial or lacustrine processes within Mangala Valles can be better explained by fluid lava flooding the channels and filling pre-existing impact craters. As for the circum-Chryse outflow channels, where no clear source of water or mechanism able to replenish water at its hydraulic head is observed, there is no geologic trace of a sudden removal of a volume of water (ice) necessary to carve Mangala Valles. Neither maars nor rootless cones, typical volcanic features indicative of interaction between lava and ground ice, were found. Past works suggested that the formation of Mangala Valles occurred in late Amazonian age when the climate of Mars was similar to that seen today, that is absolutely not liquid water friendly. The present work shows how the origin of Mangala Valles may go back to Noachian or even Pre-Noachian when other studies have concluded that the climate was not liquid water friendly. Even assuming limited periods of obliquity favourable to liquid water in the history of Mars, which is at odds with the widespread presence of unaltered olivine and jarosite, it is very difficult to find plausible mechanisms of aquifer recharge or signs of catastrophic water release at the Notch of Mangala Valles that could feed the multiple episodes, or even a single episode, of fluvial flooding suggested in the literature. This evidence and other analysis will show that the presence of water and, eventually, ground ice is not incontrovertible in the equatorial regions and should not be given for granted as commonly done so far in the literature. The geomorphological analysis of the Mars Reconnaissance Orbiter (MRO) images provided in this paper, combined with THEMIS and MOLA data, show how Mangala Fossa, from which Mangala Valles originated as a breakout, is an erosional channel formed by the flow of lava in a original tube coming from Daedalia Planum rather than a tectonic graben or the sign of a dike rupturing to the surface.

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Section: Dike Intrusionmentioning

confidence: 93%

Mangala Valles, Mars: A reassessment of formation processes based on a new geomorphological and stratigraphic analysis of the geological units

Leone¹

2017

Journal of Volcanology and Geothermal Research

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“…Simultaneous atmospheric measurements on board Curiosity (REMS) and InSight (TWINS) with similar instruments will be useful to broaden the knowledge of the Martian atmosphere. In particular, joint REMS / TWINS measurements could help to better interpret the meteorological phenomena recently attributed to the specific location of Curiosity within a crater and the influence of topography-induced circulations Ullán et al 2017;. For instance, it will be interesting to compare the turbulent convective activity in daytime between the InSight landing site in Elysium Planitia and the Curiosity site in Gale Crater, where the growth and activity in the daytime PBL is adversely affected by slope circulations (Tyler and Barnes 2015).…”

Section: Coordinated Campaigns With Roversmentioning

confidence: 99%

Atmospheric Science with InSight

et al. 2018

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“…Mesoscale prediction models of the meteorological conditions at Gale crater (e.g., Rafkin et al, 2016) help understand the observed weather patterns. Analyses of short timescale drops (e.g., Ordoñez-Etxeberria et al, 2018) and fluctuations in pressure (Kahanpää et al, 2016), as well as air and ground temperatures (Ullán et al, 2017) have been attributed to the likely effect of convection near noon and slope downflows at night, coinciding with weaker ground temperature fluctuations. This manuscript quantifies the temporal properties of these oscillations and their response to the Bagnold dunes.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Bagnold Dunes Slopes on the Short Timescale Air Temperature Fluctuations at Gale Crater on Mars

Miller

Juárez

Tamppari

2018

Geophysical Research Letters

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In situ measurements of how air temperature near the surface responds to changing topography on other planets are rare. The Bagnold dunes were investigated by Mars Science Laboratory's Curiosity rover during its second winter in Gale crater on Mars. The effect of Bagnold dune slopes on the local microclimate air temperature, potential temperature, near‐surface lapse rate, and how they change the variability of short‐lived air temperature fluctuations is described. The oscillations with periods under 24 min are characterized using Fourier analysis. Comparing the sols during the Bagnold dunes exploration to a typical southern winter sol, we characterize the changes in temperature oscillations near the east facing High dune, the west facing Namib dune, as well as in the area between the dunes. Each of the regions had distinct signatures, with the west and east orientation of the dunes affecting the data.

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Analysis of wind-induced dynamic pressure fluctuations during one and a half Martian years at Gale Crater

Cited by 17 publications

References 29 publications

Mangala Valles, Mars: A reassessment of formation processes based on a new geomorphological and stratigraphic analysis of the geological units

Mangala Valles, Mars: A reassessment of formation processes based on a new geomorphological and stratigraphic analysis of the geological units

Atmospheric Science with InSight

The Effect of Bagnold Dunes Slopes on the Short Timescale Air Temperature Fluctuations at Gale Crater on Mars

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