MadSci Network: Physics

Re: Naturally occurring 'dry ice': Mars-yes; Earth-?

Date: Fri Mar 9 07:34:28 2007
Posted By: Leslie Allen, Staff, Laboratory Chemist, Valero Refining Company
Area of science: Physics
ID: 1173383323.Ph

Hi Frank,
Frozen CO2 has been observed on other planets and that would indicate that 
CO2 would freeze on our planet when the temperature dropped below the 
freezing point of gaseous CO2. Although I've not read any references to 
observations of frozen CO2 at our poles, I would believe the possibility. 
Since the concentration of CO2 in our atmosphere runs around 0.03 to 
0.06%, it would have to remain very cold for a very long period to 
accumulate frozen CO2.

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