Through thick and thin: Marine and meteoric ice in a ``Snowball Earth'' climate

Mathematics – Logic

Scientific paper

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Atmospheric Processes: Climatology (1616, 1620, 3305, 4215, 8408), Atmospheric Processes: Paleoclimatology (0473, 4900), Oceanography: Physical: Ice Mechanics And Air/Sea/Ice Exchange Processes (0700, 0750, 0752, 0754), Planetary Sciences: Solid Surface Planets: Glaciation, Information Related To Geologic Time: Proterozoic

Scientific paper

Marine ice cover in the frigid Neoproterozoic climate system tends to isolate the ocean: the thickness of this ice, and thus the degree of isolation, is an important unknown in geochemical and biological arguments regarding the fully-glaciated ``Snowball Earth'' hypothesis. The Pollard and Kasting (2005) coupled atmosphere/ice model has been modified to track ice of marine and atmospheric origin separately, and model their different optical properties. In contrast to Pollard and Kasting's results, a tropical region of thin ice is not stable in this model: ice is hundreds of meters thick everywhere. The overall pattern of the hydrological cycle in a Snowball climate is also discussed.

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