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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ftharvardudash:oai:dash.harvard.edu:1/34493357 2023-05-15T16:41:14+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 http://nrs.harvard.edu/urn-3:HUL.InstRepos:34493357 https://doi.org/10.1126/sciadv.1600983 en_US eng American Association for the Advancement of Science doi:10.1126/sciadv.1600983 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5677351/pdf/ Science Advances Hoffman, P. F., D. S. Abbot, Y. Ashkenazy, D. I. Benn, J. J. Brocks, P. A. Cohen, G. M. Cox, et al. 2017. “Snowball Earth climate dynamics and Cryogenian geology-geobiology.” Science Advances 3 (11): e1600983. doi:10.1126/sciadv.1600983. http://dx.doi.org/10.1126/sciadv.1600983. http://nrs.harvard.edu/urn-3:HUL.InstRepos:34493357 SciAdv r-articles Physical Sciences Climatology Journal Article 2017 ftharvardudash https://doi.org/10.1126/sciadv.1600983 2022-04-05T18:38:58Z 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 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. Version of Record Article in Journal/Newspaper Ice Sheet Harvard University: DASH - Digital Access to Scholarship at Harvard Science Advances 3 11 e1600983 |
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Harvard University: DASH - Digital Access to Scholarship at Harvard |
op_collection_id |
ftharvardudash |
language |
English |
topic |
SciAdv r-articles Physical Sciences Climatology |
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SciAdv r-articles Physical Sciences Climatology 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 |
topic_facet |
SciAdv r-articles Physical Sciences Climatology |
description |
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 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. Version of Record |
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. |
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 |
publisher |
American Association for the Advancement of Science |
publishDate |
2017 |
url |
http://nrs.harvard.edu/urn-3:HUL.InstRepos:34493357 https://doi.org/10.1126/sciadv.1600983 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
doi:10.1126/sciadv.1600983 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5677351/pdf/ Science Advances Hoffman, P. F., D. S. Abbot, Y. Ashkenazy, D. I. Benn, J. J. Brocks, P. A. Cohen, G. M. Cox, et al. 2017. “Snowball Earth climate dynamics and Cryogenian geology-geobiology.” Science Advances 3 (11): e1600983. doi:10.1126/sciadv.1600983. http://dx.doi.org/10.1126/sciadv.1600983. http://nrs.harvard.edu/urn-3:HUL.InstRepos:34493357 |
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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1766031662247837696 |