The ice cap could be thinner and still protect water if it were topped with a layer of frozen atmospheric gas, such as dry ice, which is solid carbon dioxide.
若冰层上方还存在一层固态气体层，如干冰——二氧化碳的固态形式，维持液态水存在的冰层厚度要求就能相对降低。
Spring has sprung on Mars, bring with itthe disappearance of carbon dioxide ice (dry ice) that covers the northpolar sand dunes.
春天在火星上跃动，覆盖在北极沙丘上的二氧化碳干冰消失了。
Spring has sprung on Mars, bring with itthe disappearance of carbon dioxide ice (dry ice) that covers the northpolar sand dunes.
春天在火星上跃动，覆盖在北极沙丘上的二氧化碳干冰消失了。
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