Ocean Circulation under Globally Glaciated Snowball Earth Conditions: Steady-State Solutions
Between;750 and 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,...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.644.1238 2023-05-15T18:17:52+02:00 Ocean Circulation under Globally Glaciated Snowball Earth Conditions: Steady-State Solutions Yosef Ashkenazy Martin Losch Eli Tziperman The Pennsylvania State University CiteSeerX Archives 2013 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.644.1238 http://www.seas.harvard.edu/climate/eli/reprints/Ashkenazy-Gildor-Losch-Tziperman-2014.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.644.1238 http://www.seas.harvard.edu/climate/eli/reprints/Ashkenazy-Gildor-Losch-Tziperman-2014.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-2014.pdf text 2013 ftciteseerx 2016-01-08T16:05:37Z Between;750 and 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, a thick sea ice–flow model coupled to an ocean general circulation model is used to study the ocean circulation under Snowball Earth conditions. The ocean circulation is first investigated under a simplified zonal symmetry assumption, and (i) strong equatorial zonal jets and (ii) a strongmeridional overturning cell are found, limited to an area very close to the equator. The authors derive an analytic approximation for the latitude–depth ocean dynamics and find that the extent of the meridional overturning circulation cell only depends on the horizontal eddy viscosity and b (the change of the Coriolis parameter with latitude). The analytic approximation closely reproduces the numerical results. Three-dimensional ocean simulations, with reconstructed Neoproterozoic continental configuration, confirm the zonally symmetric dynamics and show additional boundary currents and strong upwelling and downwelling near the continents. 1. Text Sea ice Unknown |
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English |
description |
Between;750 and 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, a thick sea ice–flow model coupled to an ocean general circulation model is used to study the ocean circulation under Snowball Earth conditions. The ocean circulation is first investigated under a simplified zonal symmetry assumption, and (i) strong equatorial zonal jets and (ii) a strongmeridional overturning cell are found, limited to an area very close to the equator. The authors derive an analytic approximation for the latitude–depth ocean dynamics and find that the extent of the meridional overturning circulation cell only depends on the horizontal eddy viscosity and b (the change of the Coriolis parameter with latitude). The analytic approximation closely reproduces the numerical results. Three-dimensional ocean simulations, with reconstructed Neoproterozoic continental configuration, confirm the zonally symmetric dynamics and show additional boundary currents and strong upwelling and downwelling near the continents. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Yosef Ashkenazy Martin Losch Eli Tziperman |
spellingShingle |
Yosef Ashkenazy Martin Losch Eli Tziperman Ocean Circulation under Globally Glaciated Snowball Earth Conditions: Steady-State Solutions |
author_facet |
Yosef Ashkenazy Martin Losch Eli Tziperman |
author_sort |
Yosef Ashkenazy |
title |
Ocean Circulation under Globally Glaciated Snowball Earth Conditions: Steady-State Solutions |
title_short |
Ocean Circulation under Globally Glaciated Snowball Earth Conditions: Steady-State Solutions |
title_full |
Ocean Circulation under Globally Glaciated Snowball Earth Conditions: Steady-State Solutions |
title_fullStr |
Ocean Circulation under Globally Glaciated Snowball Earth Conditions: Steady-State Solutions |
title_full_unstemmed |
Ocean Circulation under Globally Glaciated Snowball Earth Conditions: Steady-State Solutions |
title_sort |
ocean circulation under globally glaciated snowball earth conditions: steady-state solutions |
publishDate |
2013 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.644.1238 http://www.seas.harvard.edu/climate/eli/reprints/Ashkenazy-Gildor-Losch-Tziperman-2014.pdf |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
http://www.seas.harvard.edu/climate/eli/reprints/Ashkenazy-Gildor-Losch-Tziperman-2014.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.644.1238 http://www.seas.harvard.edu/climate/eli/reprints/Ashkenazy-Gildor-Losch-Tziperman-2014.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766193289271181312 |