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dc.contributor.authorAshkenazy, Yosef
dc.contributor.authorGildor, Hezi
dc.contributor.authorLosch, Martin
dc.contributor.authorTziperman, Eli
dc.date.accessioned2019-09-22T15:33:33Z
dc.date.issued2014
dc.identifier.citationAshkenazy, Yosef, Hezi Gildor, Martin Losch, and Eli Tziperman. 2014. “Ocean Circulation under Globally Glaciated Snowball Earth Conditions: Steady-State Solutions.” Journal of Physical Oceanography 44 (1): 24–43. https://doi.org/10.1175/jpo-d-13-086.1.
dc.identifier.issn0022-3670
dc.identifier.issn1520-0485
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41384980*
dc.description.abstractBetween similar to 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 (similar to 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 strong meridional 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 (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.
dc.language.isoen_US
dc.publisherAmerican Meteorological Society
dash.licenseOAP
dc.titleOcean Circulation under Globally Glaciated Snowball Earth Conditions: Steady-State Solutions
dc.typeJournal Article
dc.description.versionAccepted Manuscript
dc.relation.journalJournal of Physical Oceanography
dash.depositing.authorTziperman, Eli::12292aa29638efa321fd11538b8c7466::600
dc.date.available2019-09-22T15:33:33Z
dash.workflow.comments1Science Serial ID 53886
dc.identifier.doi10.1175/JPO-D-13-086.1
dash.source.volume44;1
dash.source.page24-43


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