Quantifying the Latitudinal Distribution of Landforms on Mars' Southern Hemisphere, Terra Sirenum

As a part of a global study, we apply the gridmapping method to quantify the geographical distribution of selected (climate-related) landforms on Mars' southern hemisphere. The study areas comprise Noachis Terra, Terra Cimmeria, as well as Terra Sirenum (TS, presented here). Like in NT and TC, the low latitudes can be classified as a dry zone, lacking surface volatiles. Morphologies suggesting volatile-rich deposits are found at ≥33°S (gullies and craters filled with viscous-flow flow features). South of this latitude, the volatile-related landforms increase continuously. At 71°S a cover of polar deposits begins to extend towards the pole.