File:SnowballSimulations.jpg

"a, Ice extent at equilibrium (Mollweide projection) for a 'snowball Earth' simulation. b, Annually averaged temperature for a GCM Neoproterozoic simulation using the above ice sheets as a lower boundary condition. A considerable area of open water exists in the tropics, though the ice sheets are almost everywhere below the melting point. c, Annually averaged precipitation in the GCM experiment. The cold temperatures and restricted area of open water result in a precipitation field which is less than 0.06 mm d -1 over the ice-sheet accumulation zone."

From the following article:

Neoproterozoic 'snowball Earth' simulations with a coupled climate/ice-sheet model

William T. Hyde, Thomas J. Crowley, Steven K. Baum and W. Richard Peltier

Nature 405, 425-429(25 May 2000)

doi:10.1038/35013005

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Hyde, W. T.; Crowley, T. J.; Baum, S. K.; Peltier, W. R. (2000). "Neoproterozoic 'snowball Earth' simulations with a coupled climate/ice-sheet model". Nature. 405 (6785): 425–9. doi:10.1038/35013005. PMID 10839531.