Snowball Earth climate dynamics and Cryogenian geology-geobiology
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. Geo...
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Online Access: | https://doi.org/10.1126/sciadv.1600983 |
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ftsmithonian:oai:repository.si.edu:10088/33978 2023-05-15T16:41:15+02:00 Snowball Earth climate dynamics and Cryogenian geology-geobiology 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 Voigt, Aiko Warren, Stephen G. 2017 application/pdf https://doi.org/10.1126/sciadv.1600983 unknown Science Advances 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. " Snowball Earth climate dynamics and Cryogenian geology-geobiology ." Science Advances . 3 (11): https://doi.org/10.1126/sciadv.1600983 2375-2548 144492 doi:10.1126/sciadv.1600983 Journal Article 2017 ftsmithonian https://doi.org/10.1126/sciadv.1600983 2020-09-09T18:36:00Z 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. NH-Paleobiology NMNH Peer-reviewed Article in Journal/Newspaper Ice Sheet Unknown Science Advances 3 11 e1600983 |
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Open Polar |
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ftsmithonian |
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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. NH-Paleobiology NMNH Peer-reviewed |
format |
Article in Journal/Newspaper |
author |
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 Voigt, Aiko Warren, Stephen G. |
spellingShingle |
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 Voigt, Aiko Warren, Stephen G. Snowball Earth climate dynamics and Cryogenian geology-geobiology |
author_facet |
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 Voigt, Aiko Warren, Stephen G. |
author_sort |
Hoffman, Paul F. |
title |
Snowball Earth climate dynamics and Cryogenian geology-geobiology |
title_short |
Snowball Earth climate dynamics and Cryogenian geology-geobiology |
title_full |
Snowball Earth climate dynamics and Cryogenian geology-geobiology |
title_fullStr |
Snowball Earth climate dynamics and Cryogenian geology-geobiology |
title_full_unstemmed |
Snowball Earth climate dynamics and Cryogenian geology-geobiology |
title_sort |
snowball earth climate dynamics and cryogenian geology-geobiology |
publishDate |
2017 |
url |
https://doi.org/10.1126/sciadv.1600983 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Science Advances 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. " Snowball Earth climate dynamics and Cryogenian geology-geobiology ." Science Advances . 3 (11): https://doi.org/10.1126/sciadv.1600983 2375-2548 144492 doi:10.1126/sciadv.1600983 |
op_doi |
https://doi.org/10.1126/sciadv.1600983 |
container_title |
Science Advances |
container_volume |
3 |
container_issue |
11 |
container_start_page |
e1600983 |
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