Results 21 to 30 of about 2,147 (148)
Climate and ocean circulation in the aftermath of a Marinoan snowball Earth [PDF]
Climate of the Past, 2022 When a snowball Earth deglaciates through a very high atmospheric CO2 concentration, the resulting inflow of freshwater leads to a stably stratified ocean, and the strong greenhouse conditions drive the climate into a very warm state.
L. Ramme +3 more
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Dynamics of a Snowball Earth ocean [PDF]
Nature, 2013 Geological evidence suggests that marine ice extended to the Equator at least twice during the Neoproterozoic era (about 750 to 635 million years ago), inspiring the Snowball Earth hypothesis that the Earth was globally ice-covered. In a possible Snowball Earth climate, ocean circulation and mixing processes would have set the melting and freezing ...
Ashkenazy, Yosef +5 more
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Simple Stochastic Modeling of Snowball Probability Throughout Earth History
Geochemistry, Geophysics, Geosystems, 2022 Over its multibillion‐year history, Earth has exhibited a wide range of climates. Its history ranges from snowball episodes where the surface was mostly or entirely covered by ice to periods much warmer than today, where the cryosphere was virtually ...
Mark Baum, Minmin Fu
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Frontiers in Earth Science, 2022 The history of the nitrogen cycle on Earth is linked to the redox evolution of the surface environment. Many nitrogen cycle fluxes are microbially mediated, and the particular fluxes operating at any given time in an ecosystem depend on the presence ...
Benjamin W. Johnson +2 more
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Amplified cooling of Snowball Earth from a salt-albedo feedback [PDF]
Climate of the PastIt is believed that the atmospheric circulation on Snowball Earth produced a net ablation zone exposing bare sea ice. Under sufficiently low temperatures, salt begins to precipitate out of sea ice, forming a lag deposit of crystals with high albedo as ...
A. Samuelsberg +2 more
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Sensitivity of Neoproterozoic snowball-Earth inceptions to continental configuration, orbital geometry, and volcanism [PDF]
Climate of the Past, 2023 The Cryogenian period (720–635 million years ago) in the Neoproterozoic era featured two phases of global or near-global ice cover termed “snowball Earth”.
J. Eberhard +6 more
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Sea-ice dynamics strongly promote Snowball Earth initiation and destabilize tropical sea-ice margins [PDF]
Climate of the Past, 2012 The Snowball Earth bifurcation, or runaway ice-albedo feedback, is defined for particular boundary conditions by a critical CO<sub>2</sub> and a critical sea-ice cover (SI), both of which are essential for evaluating hypotheses related to ...
A. Voigt, D. S. Abbot
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Carbon cycling and snowball Earth [PDF]
Nature, 2008 The possibility that Earth witnessed episodes of global glaciation during the latest Precambrian challenges our understanding of the physical processes controlling the Earth's climate. Peltier et al. suggest that a 'hard snowball Earth' state may have been prevented owing to the release of CO(2) from the oxidation of dissolved organic carbon (DOC) in ...
Goddéris, Yves, Donnadieu, Yannick
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Geosciences, 2012 Evidence based on molecular clocks, together with molecular evidence/biomarkers and putative body fossils, points to major evolutionary events prior to and during the intense Cryogenian and Ediacaran glaciations. The glaciations themselves were of global
Daniel Paul Le Heron
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