Any chance they could be small dust storm that are caused by just the air being at different temps during that period of the year, wind that had tow temps that vary from almost +27c (noonday high on a slope that is close to 90deg to the sun) and in the deep shadows where it would be close to -100c.
If it was really salty water would the salt not be left on the surface rather than sinking into the ground with the water (or evaporating), that would leave a spot that was lighter in color.
Cool! Looking at the planet at the beginning of the vid, it sure looks like
some kind of ice cap at the southern(?) pole. Is it too much of a stretch
to picture some form of live (even at the microbial level) eaking out an
existance with flowing water for even some parts of the year?
CO2 condenses int dry ice at those extreme temps, Water could never get there as it would condense long before those temps could be reached.
Carbon dioxide - Wikipedia, the free encyclopedia
Above −78.51 °C (−109.32 °F), carbon dioxide changes directly from a solid phase to a gaseous phase through
sublimation, or from gaseous to solid through
deposition. Solid carbon dioxide is commonly called "
dry ice", a
generic trademark.
Climate of Mars - Wikipedia, the free encyclopedia
Temperature
Differing values have been reported for the average temperature on Mars,
[15] with a common value being −55 °C (−67 °F).
[16] Surface temperatures have been estimated from the Viking Orbiter Infrared Thermal Mapper data; this gives extremes from a warmest of 27 °C (81 °F) to −143 °C (−225 °F) at the winter polar caps.
[17] Actual temperature measurements from the Viking landers range from −17.2 °C (1.0 °F) to −107 °C (−161 °F).