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dc.contributor.authorHoffman, Paul F.
dc.contributor.authorAbbot, Dorian S.
dc.contributor.authorAshkenazy, Yosef
dc.contributor.authorBenn, Douglas I.
dc.contributor.authorBrocks, Jochen J.
dc.contributor.authorCohen, Phoebe A.
dc.contributor.authorCox, Grant M.
dc.contributor.authorCreveling, Jessica R.
dc.contributor.authorDonnadieu, Yannick
dc.contributor.authorErwin, Douglas H.
dc.contributor.authorFairchild, Ian J.
dc.contributor.authorFerreira, David
dc.contributor.authorGoodman, Jason C.
dc.contributor.authorHalverson, Galen P.
dc.contributor.authorJansen, Malte F.
dc.contributor.authorLe Hir, Guillaume
dc.contributor.authorLove, Gordon D.
dc.contributor.authorMacdonald, Francis A.
dc.contributor.authorMaloof, Adam C.
dc.contributor.authorPartin, Camille A.
dc.contributor.authorRamstein, Gilles
dc.contributor.authorRose, Brian E. J.
dc.contributor.authorRose, Catherine V.
dc.contributor.authorSadler, Peter M.
dc.contributor.authorTziperman, Eli
dc.contributor.authorVoigt, Aiko
dc.contributor.authorWarren, Stephen G.
dc.date.accessioned2017-11-29T11:30:11Z
dc.date.available2017-11-29T11:30:11Z
dc.date.issued2017-11-08
dc.identifier.citationHoffman , P F , Abbot , D S , Ashkenazy , Y , Benn , D I , Brocks , J J , Cohen , P A , Cox , G M , Creveling , J R , Donnadieu , Y , Erwin , D H , Fairchild , I J , Ferreira , D , Goodman , J C , Halverson , G P , Jansen , M F , Le Hir , G , Love , G D , Macdonald , F A , Maloof , A C , Partin , C A , Ramstein , G , Rose , B E J , Rose , C V , Sadler , P M , Tziperman , E , Voigt , A & Warren , S G 2017 , ' Snowball Earth climate dynamics and Cryogenian geology-geobiology ' , Science Advances , vol. 3 , no. 11 , e1600983 . https://doi.org/10.1126/sciadv.1600983en
dc.identifier.issn2375-2548
dc.identifier.otherPURE: 250641115
dc.identifier.otherPURE UUID: 8881bdb9-02ea-433e-999c-689c29b5d051
dc.identifier.otherBibtex: urn:b23f40752d81a3b6043ba17e225716bb
dc.identifier.otherScopus: 85041915320
dc.identifier.otherORCID: /0000-0001-8149-0977/work/44097011
dc.identifier.otherWOS: 000418002000002
dc.identifier.otherORCID: /0000-0002-3604-0886/work/64697397
dc.identifier.urihttp://hdl.handle.net/10023/12187
dc.descriptionG.R. was supported by CNRS funding through the ECLIPSE program. B.E.J.R. was supported by NSF grant AGS-1455071. A.V. was supported by the German Federal Ministry of Education and Research (BMBF) and Research for Sustainable Development (FONA) (www.fona.de) under grant 01LK1509A. S.G.W. was supported by NSF grant ANT-1142963.en
dc.description.abstractGeological 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 102 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.
dc.format.extent43
dc.language.isoeng
dc.relation.ispartofScience Advancesen
dc.rightsCopyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.en
dc.subjectGE Environmental Sciencesen
dc.subjectQE Geologyen
dc.subjectT-DASen
dc.subjectBDCen
dc.subject.lccGEen
dc.subject.lccQEen
dc.titleSnowball Earth climate dynamics and Cryogenian geology-geobiologyen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Geography & Sustainable Developmenten
dc.contributor.institutionUniversity of St Andrews. School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews. Bell-Edwards Geographic Data Instituteen
dc.identifier.doihttps://doi.org/10.1126/sciadv.1600983
dc.description.statusPeer revieweden


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