Are there any places featuring permanent dry ice (carbon dioxide ice) on Mars?
Is there dry ice at the poles?
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$\begingroup$ Also related: astronomy.stackexchange.com/q/32484/16685 That question is mostly about Martian water, but I do briefly mention CO2 ice in my answer. $\endgroup$– PM 2RingCommented Aug 3, 2020 at 9:35
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Yes.
The Southern polar ice cap has a covering of $\mathrm{CO_2}$ about 8 m thick that doesn't completely disappear in summer. It remains in "pits" of up to about 1km in diameter. The thinner dry ice layer in the North sublimes completely into the atmosphere in summer. [source]
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$\begingroup$ Nice answer, thank you! How thick is the covering in the summer? I guess its 8m in the winter so its thinner in the summer $\endgroup$– Joe JobsCommented Aug 2, 2020 at 19:57
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$\begingroup$ Does it mean South pole don't have water ice? $\endgroup$– VikasCommented Apr 20, 2021 at 5:37