Recurring Slope Lineae on the Northern Hemisphere of Mars: an investigation into the new candidate sites

Detta är en Master-uppsats från Göteborgs universitet/Institutionen för geovetenskaper

Sammanfattning: Recurring Slope Lineae (RSL), are dark markings found on slopes with a steepness of 25°-45°. Their width is between 0.5-5 m but they can become hundreds of meters long. They growincrementally during warm seasons; fade during cold seasons and appear again the followingMars year. They occur mainly in the equatorial and southern mid-latitudes and appear lessabundant in the northern hemisphere. After the first confirmed observations of RSL, researchabout them accelerated quickly. This is mainly because of their possible origin as water flowsat the modern day martian surface. The main scope of this thesis is to find new RSL candidatesites in the less investigated northern hemisphere. Furthermore, the thesis investigates ifpotential candidate sites are wet- or dry flows since the processes behind RSL are stilldebated. By using a GIS ArcMap model, data from the High Resolution Imaging ScienceExperiment (HiRISE) instrument and parameters based on previous literature, new optimalsites for RSL were found with 27 of those areas having features being classified as newcandidate RSL. Analyses of interesting candidate sites with modelled temperaturemeasurements, grain size approximations, modelled water vapour data and parameters derivedfrom previous studies suggests that a combination of wet flows and dry flows may beresponsible for the creation of RSL. The reason for the scarcity in the northern region is dueto less favourable RSL forming areas, less HiRISE coverage and less favourable temperatureparameters on the northern hemisphere. For future studies it is suggested that more HiRISEimages are gathered for the candidate sites and more research is done on a combined model ofRSL creation.

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