Sea level and deep-sea temperature reconstructions suggest quasi-stable states and critical transitions over the past 40 million years
Sea level and deep-sea temperature variations are key indicators of global climate changes. For continuous records over millions of years, deep-sea carbonate microfossil-based 18O (c) records are indispensable because they reflect changes in both deep-sea temperature and seawater 18O (w); the latter...
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ftsouthampton:oai:eprints.soton.ac.uk:490646 2024-06-23T07:53:48+00:00 Sea level and deep-sea temperature reconstructions suggest quasi-stable states and critical transitions over the past 40 million years Rohling, Eelco J. Yu, Jimin Heslop, David Foster, Gavin L. Opdyke, Bradley Roberts, Andrew P. 2021-06-25 text https://eprints.soton.ac.uk/490646/ https://eprints.soton.ac.uk/490646/1/sciadv.abf5326.pdf en English eng https://eprints.soton.ac.uk/490646/1/sciadv.abf5326.pdf Rohling, Eelco J., Yu, Jimin, Heslop, David, Foster, Gavin L., Opdyke, Bradley and Roberts, Andrew P. (2021) Sea level and deep-sea temperature reconstructions suggest quasi-stable states and critical transitions over the past 40 million years. Science Advances, 7 (26), [eabf5326]. (doi:10.1126/sciadv.abf5326 <http://dx.doi.org/10.1126/sciadv.abf5326>). cc_by_nc_4 Article PeerReviewed 2021 ftsouthampton https://doi.org/10.1126/sciadv.abf5326 2024-06-05T00:10:48Z Sea level and deep-sea temperature variations are key indicators of global climate changes. For continuous records over millions of years, deep-sea carbonate microfossil-based 18O (c) records are indispensable because they reflect changes in both deep-sea temperature and seawater 18O (w); the latter are related to ice volume and, thus, to sea level changes. Deep-sea temperature is usually resolved using elemental ratios in the same benthic microfossil shells used for c, with linear scaling of residual w to sea level changes. Uncertainties are large and the linear-scaling assumption remains untested. Here, we present a new process-based approach to assess relationships between changes in sea level, mean ice sheet 18O, and both deep-sea w and temperature and find distinct nonlinearity between sea level and w changes. Application to c records over the past 40 million years suggests that Earth's climate system has complex dynamical behavior, with threshold-like adjustments (critical transitions) that separate quasi-stable deep-sea temperature and ice-volume states. Article in Journal/Newspaper Ice Sheet University of Southampton: e-Prints Soton Science Advances 7 26 |
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Open Polar |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
English |
description |
Sea level and deep-sea temperature variations are key indicators of global climate changes. For continuous records over millions of years, deep-sea carbonate microfossil-based 18O (c) records are indispensable because they reflect changes in both deep-sea temperature and seawater 18O (w); the latter are related to ice volume and, thus, to sea level changes. Deep-sea temperature is usually resolved using elemental ratios in the same benthic microfossil shells used for c, with linear scaling of residual w to sea level changes. Uncertainties are large and the linear-scaling assumption remains untested. Here, we present a new process-based approach to assess relationships between changes in sea level, mean ice sheet 18O, and both deep-sea w and temperature and find distinct nonlinearity between sea level and w changes. Application to c records over the past 40 million years suggests that Earth's climate system has complex dynamical behavior, with threshold-like adjustments (critical transitions) that separate quasi-stable deep-sea temperature and ice-volume states. |
format |
Article in Journal/Newspaper |
author |
Rohling, Eelco J. Yu, Jimin Heslop, David Foster, Gavin L. Opdyke, Bradley Roberts, Andrew P. |
spellingShingle |
Rohling, Eelco J. Yu, Jimin Heslop, David Foster, Gavin L. Opdyke, Bradley Roberts, Andrew P. Sea level and deep-sea temperature reconstructions suggest quasi-stable states and critical transitions over the past 40 million years |
author_facet |
Rohling, Eelco J. Yu, Jimin Heslop, David Foster, Gavin L. Opdyke, Bradley Roberts, Andrew P. |
author_sort |
Rohling, Eelco J. |
title |
Sea level and deep-sea temperature reconstructions suggest quasi-stable states and critical transitions over the past 40 million years |
title_short |
Sea level and deep-sea temperature reconstructions suggest quasi-stable states and critical transitions over the past 40 million years |
title_full |
Sea level and deep-sea temperature reconstructions suggest quasi-stable states and critical transitions over the past 40 million years |
title_fullStr |
Sea level and deep-sea temperature reconstructions suggest quasi-stable states and critical transitions over the past 40 million years |
title_full_unstemmed |
Sea level and deep-sea temperature reconstructions suggest quasi-stable states and critical transitions over the past 40 million years |
title_sort |
sea level and deep-sea temperature reconstructions suggest quasi-stable states and critical transitions over the past 40 million years |
publishDate |
2021 |
url |
https://eprints.soton.ac.uk/490646/ https://eprints.soton.ac.uk/490646/1/sciadv.abf5326.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://eprints.soton.ac.uk/490646/1/sciadv.abf5326.pdf Rohling, Eelco J., Yu, Jimin, Heslop, David, Foster, Gavin L., Opdyke, Bradley and Roberts, Andrew P. (2021) Sea level and deep-sea temperature reconstructions suggest quasi-stable states and critical transitions over the past 40 million years. Science Advances, 7 (26), [eabf5326]. (doi:10.1126/sciadv.abf5326 <http://dx.doi.org/10.1126/sciadv.abf5326>). |
op_rights |
cc_by_nc_4 |
op_doi |
https://doi.org/10.1126/sciadv.abf5326 |
container_title |
Science Advances |
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7 |
container_issue |
26 |
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1802645634462777344 |