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Snowball Earth climate dynamics and Cryogenian geology-geobiology

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dc.contributor.author Hoffman, Paul F. en
dc.contributor.author Abbot, Dorian S. en
dc.contributor.author Ashkenazy, Yosef en
dc.contributor.author Benn, Douglas I. en
dc.contributor.author Brocks, Jochen J. en
dc.contributor.author Cohen, Phoebe A. en
dc.contributor.author Cox, Grant M. en
dc.contributor.author Creveling, Jessica R. en
dc.contributor.author Donnadieu, Yannick en
dc.contributor.author Erwin, Douglas H. en
dc.contributor.author Fairchild, Ian J. en
dc.contributor.author Ferreira, David en
dc.contributor.author Goodman, Jason C. en
dc.contributor.author Halverson, Galen P. en
dc.contributor.author Jansen, Malte F. en
dc.contributor.author Le Hir, Guillaume en
dc.contributor.author Love, Gordon D. en
dc.contributor.author Macdonald, Francis A. en
dc.contributor.author Maloof, Adam C. en
dc.contributor.author Partin, Camille A. en
dc.contributor.author Ramstein, Gilles en
dc.contributor.author Rose, Brian E. J. en
dc.contributor.author Rose, Catherine V. en
dc.contributor.author Sadler, Peter M. en
dc.contributor.author Tziperman, Eli en
dc.contributor.author Voigt, Aiko en
dc.contributor.author Warren, Stephen G. en
dc.date.accessioned 2017-11-16T17:22:54Z
dc.date.available 2017-11-16T17:22:54Z
dc.date.issued 2017
dc.identifier.citation Hoffman, Paul F., Abbot, Dorian S., Ashkenazy, Yosef, Benn, Douglas I., Brocks, Jochen J., Cohen, Phoebe A., Cox, Grant M., Creveling, Jessica R., Donnadieu, Yannick, Erwin, Douglas H., Fairchild, Ian J., Ferreira, David, Goodman, Jason C., Halverson, Galen P., Jansen, Malte F., Le Hir, Guillaume, Love, Gordon D., Macdonald, Francis A., Maloof, Adam C., Partin, Camille A., Ramstein, Gilles, Rose, Brian E. J., Rose, Catherine V., Sadler, Peter M., Tziperman, Eli et al. 2017. "<a href="https://repository.si.edu/handle/10088/33978">Snowball Earth climate dynamics and Cryogenian geology-geobiology</a>." <em>Science Advances</em>. 3 (11):<a href="https://doi.org/10.1126/sciadv.1600983">https://doi.org/10.1126/sciadv.1600983</a> en
dc.identifier.issn 2375-2548
dc.description.abstract Geological evidence indicates that grounded ice sheets reached sea level at all latitudes during two long-lived Cryogenian (58 and =5 My) glaciations. Combined uranium-lead and rhenium-osmium dating suggests that the older (Sturtian) glacial onset and both terminations were globally synchronous. Geochemical data imply that CO2 was 10(2) PAL (present atmospheric level) at the younger termination, consistent with a global ice cover. Sturtian glaciation followed breakup of a tropical supercontinent, and its onset coincided with the equatorial emplacement of a large igneous province. Modeling shows that the small thermal inertia of a globally frozen surface reverses the annual mean tropical atmospheric circulation, producing an equatorial desert and net snow and frost accumulation elsewhere. Oceanic ice thickens, forming a sea glacier that flows gravitationally toward the equator, sustained by the hydrologic cycle and by basal freezing and melting. Tropical ice sheets flow faster as CO2 rises but lose mass and become sensitive to orbital changes. Equatorial dust accumulation engenders supraglacial oligotrophic meltwater ecosystems, favorable for cyanobacteria and certain eukaryotes. Meltwater flushing through cracks enables organic burial and submarine deposition of airborne volcanic ash. The subglacial ocean is turbulent and well mixed, in response to geothermal heating and heat loss through the ice cover, increasing with latitude. Terminal carbonate deposits, unique to Cryogenian glaciations, are products of intense weathering and ocean stratification. Whole-ocean warming and collapsing peripheral bulges allow marine coastal flooding to continue long after ice-sheet disappearance. The evolutionary legacy of Snowball Earth is perceptible in fossils and living organisms. en
dc.relation.ispartof Science Advances en
dc.title Snowball Earth climate dynamics and Cryogenian geology-geobiology en
dc.type Journal Article en
dc.identifier.srbnumber 144492
dc.identifier.doi 10.1126/sciadv.1600983
rft.jtitle Science Advances
rft.volume 3
rft.issue 11
dc.description.SIUnit NH-Paleobiology en
dc.description.SIUnit NMNH en
dc.description.SIUnit Peer-reviewed en

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