Tuesday, November 13, 2018

Not 2 Green | Another Planet ?

According to data in my books CO2 sublimes at -78.5 °C at 1 atmosphere pressure. The liquid phase is only possible at a minimum pressure of 5 atmospheres, where the solid melts at -56.7 °C.
Given that the partial pressure of CO2 in the atmosphere is about 0.0004 atmospheres, at -80 °C ( ~ -113 °F) freezing it out of the atmosphere would not be possible – or am I missing something ?

The lowest measured air temperature on Earth is −89.2 °C ( −129 F ) on 23 July 1983, observed at Vostok Station in Antarctica ( Turner et al., 2009, https://doi.org/10.1029/2009JD012104 ).  However, satellite data collected during the Antarctic polar night during 2004 – 2016 reveal a broad region of the high East Antarctic Plateau above Vostok that regularly reaches snow surface temperatures of −90 °C and below.



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