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Authors: Nardi, Adriano* 
Piersanti, Antonio* 
Title: Geomorphologic observations and physical hypothesis on Martian gullies
Other Titles: Osservazioni geomorfologiche e ipotesi fisiche sulla natura dei calanchi marziani
Journal: Italian Journal of Geosciences 
Series/Report no.: 2/141 (2022)
Publisher: SGI
Issue Date: Jun-2022
DOI: 10.3301/IJG.2022.12
Keywords: Mars
liquid water
Subject Classification05.07. Space and Planetary sciences
03.02. Hydrology
Abstract: We propose a hypothesis to explain the erosive phenomenon of Martian gullies under current climatic conditions. This model is consistent with the morphology and finds support in the characteristic geographic diffusion of the gullies, which seem to avoid exposure to the sun and the hottest latitudes. We hypothesize a transient flow of spring water fed by melting permafrost which can occur only in certain latitudes and altitudes, with seasonal variability and for a very short time. Furthermore, this phenomenon can only occur in certain ranges of temperature and pressure, therefore when particular and sporadic weather conditions allow it. For this reason, we propose to call it weather-springing water (WSW).
Description: Hypothesis on the presence of liquid water on the Martian surface under current climatic conditions. --- Ipotesi sulla presenza di acqua liquida sulla superficie di Marte alle attuali condizioni climatiche.
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