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Journal Articles Geophysical Research Letters Year : 2012

Clouds and Snowball Earth deglaciation

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Dorian S. Abbot
  • Function : Author
Aiko Voigt
  • Function : Author
Mark Branson
  • Function : Author
Raymond T. Pierrehumbert
  • Function : Author
David Pollard
Guillaume Le Hir
Daniel D. B. Koll
  • Function : Author

Abstract

Neoproterozoic, and possibly Paleoproterozoic, glaciations represent the most extreme climate events in post-Hadean Earth, and may link closely with the evolution of the atmosphere and life. According to the Snowball Earth hypothesis, the entire ocean was covered with ice during these events for a few million years, during which time volcanic CO2 increased enough to cause deglaciation. Geochemical proxy data and model calculations suggest that the maximum CO2 was 0.01-0.1 by volume, but early climate modeling suggested that deglaciation was not possible at CO2 = 0.2. We use results from six different general circulation models (GCMs) to show that clouds could warm a Snowball enough to reduce the CO2 required for deglaciation by a factor of 10-100. Although more work is required to rigorously validate cloud schemes in Snowball-like conditions, our results suggest that Snowball deglaciation is consistent with observations.
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insu-03583017 , version 1 (22-02-2022)

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Dorian S. Abbot, Aiko Voigt, Mark Branson, Raymond T. Pierrehumbert, David Pollard, et al.. Clouds and Snowball Earth deglaciation. Geophysical Research Letters, 2012, 39, p. 39-48. ⟨10.1029/2012GL052861⟩. ⟨insu-03583017⟩
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