universetoday.com
Mystery of Martian Icecaps Explained - Universe Today
Mars' southern polar ice cap is completely off-centre. Researchers working with NASA think they have an answer to this lopsided mystery: the weather. Mars' southern hemisphere seems to be much colder and stormier than its northern hemisphere, and the southern icecap is only 1/10 the size of its northern counterpart. The researchers have discovered that Mars has two regional climates on either side of the pole, which are caused by two large craters that create a low-pressure system that sits over the southern ice cap and keeps it in one location.