Abstract
Recent coupled energy balance/ice sheet modeling studies indicate that ice‐covered continents can be simulated for the Late Precambrian with 6% solar constant reduction. We examine the ocean mixed layer response to such an ice sheet with the GENESIS 2 general circulation model and CO2 levels varying from 0.5–2.5 times present. The ocean ices over completely at 0.5–1.0X present levels, with the final phase of sea ice growth occurring within a single model year. A qualitatively different 2.5X CO2 solution is close to equilibrium and yields open water between ∼25 °N and ∼25 °S paleolatitude. The prevailing wind patterns suggest that an equatorial Pacific‐type circulation may have developed in part of the Neoproterozoic ocean.
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