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Between ∼750 to 635 million years ago, during the Neoproterozoic era, the Earth experienced at least two significant, possibly global, glaciations, termed “Snowball Earth”. While many studies have focused on the dynamics and the role of the atmosphere and ice flow over the ocean in these events, onl...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.399.9855 2023-05-15T18:17:46+02:00 3 Yosef Ashkenazy Hezi Gildor Martin Losch Eli Tziperman The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.399.9855 http://www.seas.harvard.edu/climate/eli/reprints/Ashkenazy-Gildor-Losch-Tziperman-2013-preprint.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.399.9855 http://www.seas.harvard.edu/climate/eli/reprints/Ashkenazy-Gildor-Losch-Tziperman-2013-preprint.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.seas.harvard.edu/climate/eli/reprints/Ashkenazy-Gildor-Losch-Tziperman-2013-preprint.pdf text ftciteseerx 2016-09-25T00:13:59Z Between ∼750 to 635 million years ago, during the Neoproterozoic era, the Earth experienced at least two significant, possibly global, glaciations, termed “Snowball Earth”. While many studies have focused on the dynamics and the role of the atmosphere and ice flow over the ocean in these events, only a few have investigated the related associated ocean circulation, and no study has examined the ocean circulation under a thick (∼1 km deep) sea-ice cover, driven by geothermal heat flux. Here, we use a thick sea-ice flow model coupled to an ocean general circulation model to study the ocean circulation under Snowball Earth conditions. We first investigate the ocean circulation under simplified zonal symmetry assumption and find (i) strong equatorial zonal jets, and (ii) a strong meridional overturning cell, limited to an area very close to the equator. We derive an analytic approximation for the latitudedepth ocean dynamics and find that the extent of the meridional overturning circulation cell only depends on the horizontal eddy viscosity and β (the change of the Coriolis parameter with latitude). The analytic approximation closely reproduces the numerical results. Threedimensional ocean simulations, with reconstructed Neoproterozoic continents configuration Text Sea ice Unknown |
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Between ∼750 to 635 million years ago, during the Neoproterozoic era, the Earth experienced at least two significant, possibly global, glaciations, termed “Snowball Earth”. While many studies have focused on the dynamics and the role of the atmosphere and ice flow over the ocean in these events, only a few have investigated the related associated ocean circulation, and no study has examined the ocean circulation under a thick (∼1 km deep) sea-ice cover, driven by geothermal heat flux. Here, we use a thick sea-ice flow model coupled to an ocean general circulation model to study the ocean circulation under Snowball Earth conditions. We first investigate the ocean circulation under simplified zonal symmetry assumption and find (i) strong equatorial zonal jets, and (ii) a strong meridional overturning cell, limited to an area very close to the equator. We derive an analytic approximation for the latitudedepth ocean dynamics and find that the extent of the meridional overturning circulation cell only depends on the horizontal eddy viscosity and β (the change of the Coriolis parameter with latitude). The analytic approximation closely reproduces the numerical results. Threedimensional ocean simulations, with reconstructed Neoproterozoic continents configuration |
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The Pennsylvania State University CiteSeerX Archives |
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Yosef Ashkenazy Hezi Gildor Martin Losch Eli Tziperman |
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Yosef Ashkenazy Hezi Gildor Martin Losch Eli Tziperman 3 |
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Yosef Ashkenazy Hezi Gildor Martin Losch Eli Tziperman |
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Yosef Ashkenazy |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.399.9855 http://www.seas.harvard.edu/climate/eli/reprints/Ashkenazy-Gildor-Losch-Tziperman-2013-preprint.pdf |
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Sea ice |
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Sea ice |
op_source |
http://www.seas.harvard.edu/climate/eli/reprints/Ashkenazy-Gildor-Losch-Tziperman-2013-preprint.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.399.9855 http://www.seas.harvard.edu/climate/eli/reprints/Ashkenazy-Gildor-Losch-Tziperman-2013-preprint.pdf |
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