Exploring uncertainties in the relationship between temperature, ice volume, and sea level over the past 50 million years
Over the past decade, efforts to estimate temperature and sea level for the past 50 Ma have increased. In parallel, efforts to model ice sheet changes during this period have been ongoing. We review published paleodata and modeling work to provide insights into how sea level responds to changing tem...
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2012
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:19781 2023-05-15T13:39:53+02:00 Exploring uncertainties in the relationship between temperature, ice volume, and sea level over the past 50 million years Gasson, Edward Siddall, Mark Lunt, Daniel J. Rackham, Owen J. L. Lear, Caroline Helen Pollard, David 2012-03 application/pdf https://orca.cardiff.ac.uk/id/eprint/19781/ https://doi.org/10.1029/2011RG000358 https://orca.cardiff.ac.uk/id/eprint/19781/1/Gasson%202012.pdf en eng American Geophysical Union https://orca.cardiff.ac.uk/id/eprint/19781/1/Gasson%202012.pdf Gasson, Edward, Siddall, Mark, Lunt, Daniel J., Rackham, Owen J. L., Lear, Caroline Helen https://orca.cardiff.ac.uk/view/cardiffauthors/A048848V.html orcid:0000-0002-7533-4430 orcid:0000-0002-7533-4430 and Pollard, David 2012. Exploring uncertainties in the relationship between temperature, ice volume, and sea level over the past 50 million years. Reviews of Geophysics 50 (1) , RG1005. 10.1029/2011RG000358 https://doi.org/10.1029/2011RG000358 file https://orca.cardiff.ac.uk/19781/1/Gasson%202012.pdf doi:10.1029/2011RG000358 GC Oceanography QE Geology Article PeerReviewed 2012 ftunivcardiff https://doi.org/10.1029/2011RG000358 2022-10-20T22:37:03Z Over the past decade, efforts to estimate temperature and sea level for the past 50 Ma have increased. In parallel, efforts to model ice sheet changes during this period have been ongoing. We review published paleodata and modeling work to provide insights into how sea level responds to changing temperature through changes in ice volume and thermal expansion. To date, the temperature to sea level relationship has been explored for the transition from glacial to interglacial states. Attempts to synthesize the temperature to sea level relationship in deeper time, when temperatures were significantly warmer than present, have been tentative. We first review the existing temperature and sea level data and model simulations, with a discussion of uncertainty in each of these approaches. We then synthesize the sea level and temperature data and modeling results we have reviewed to test plausible forms for the sea level versus temperature relationship. On this very long timescale there are no globally representative temperature proxies, and so we investigate this relationship using deep-sea temperature records and surface temperature records from high and low latitudes. It is difficult to distinguish between the different plausible forms of the temperature to sea level relationship given the wide errors associated with the proxy estimates. We argue that for surface high-latitude Southern Hemisphere temperature and deep-sea temperature, the rate of change of sea level to temperature has not remained constant, i.e., linear, over the past 50 Ma, although the relationship remains ambiguous for the available low-latitude surface temperature data. A nonlinear form between temperature and sea level is consistent with ice sheet modeling studies. This relationship can be attributed to (1) the different glacial thresholds for Southern Hemisphere glaciation compared to Northern Hemisphere glaciation and (2) the ice sheet carrying capacity of the Antarctic continent. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Cardiff University: ORCA (Online Research @ Cardiff) Antarctic The Antarctic Reviews of Geophysics 50 1 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
topic |
GC Oceanography QE Geology |
spellingShingle |
GC Oceanography QE Geology Gasson, Edward Siddall, Mark Lunt, Daniel J. Rackham, Owen J. L. Lear, Caroline Helen Pollard, David Exploring uncertainties in the relationship between temperature, ice volume, and sea level over the past 50 million years |
topic_facet |
GC Oceanography QE Geology |
description |
Over the past decade, efforts to estimate temperature and sea level for the past 50 Ma have increased. In parallel, efforts to model ice sheet changes during this period have been ongoing. We review published paleodata and modeling work to provide insights into how sea level responds to changing temperature through changes in ice volume and thermal expansion. To date, the temperature to sea level relationship has been explored for the transition from glacial to interglacial states. Attempts to synthesize the temperature to sea level relationship in deeper time, when temperatures were significantly warmer than present, have been tentative. We first review the existing temperature and sea level data and model simulations, with a discussion of uncertainty in each of these approaches. We then synthesize the sea level and temperature data and modeling results we have reviewed to test plausible forms for the sea level versus temperature relationship. On this very long timescale there are no globally representative temperature proxies, and so we investigate this relationship using deep-sea temperature records and surface temperature records from high and low latitudes. It is difficult to distinguish between the different plausible forms of the temperature to sea level relationship given the wide errors associated with the proxy estimates. We argue that for surface high-latitude Southern Hemisphere temperature and deep-sea temperature, the rate of change of sea level to temperature has not remained constant, i.e., linear, over the past 50 Ma, although the relationship remains ambiguous for the available low-latitude surface temperature data. A nonlinear form between temperature and sea level is consistent with ice sheet modeling studies. This relationship can be attributed to (1) the different glacial thresholds for Southern Hemisphere glaciation compared to Northern Hemisphere glaciation and (2) the ice sheet carrying capacity of the Antarctic continent. |
format |
Article in Journal/Newspaper |
author |
Gasson, Edward Siddall, Mark Lunt, Daniel J. Rackham, Owen J. L. Lear, Caroline Helen Pollard, David |
author_facet |
Gasson, Edward Siddall, Mark Lunt, Daniel J. Rackham, Owen J. L. Lear, Caroline Helen Pollard, David |
author_sort |
Gasson, Edward |
title |
Exploring uncertainties in the relationship between temperature, ice volume, and sea level over the past 50 million years |
title_short |
Exploring uncertainties in the relationship between temperature, ice volume, and sea level over the past 50 million years |
title_full |
Exploring uncertainties in the relationship between temperature, ice volume, and sea level over the past 50 million years |
title_fullStr |
Exploring uncertainties in the relationship between temperature, ice volume, and sea level over the past 50 million years |
title_full_unstemmed |
Exploring uncertainties in the relationship between temperature, ice volume, and sea level over the past 50 million years |
title_sort |
exploring uncertainties in the relationship between temperature, ice volume, and sea level over the past 50 million years |
publisher |
American Geophysical Union |
publishDate |
2012 |
url |
https://orca.cardiff.ac.uk/id/eprint/19781/ https://doi.org/10.1029/2011RG000358 https://orca.cardiff.ac.uk/id/eprint/19781/1/Gasson%202012.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/19781/1/Gasson%202012.pdf Gasson, Edward, Siddall, Mark, Lunt, Daniel J., Rackham, Owen J. L., Lear, Caroline Helen https://orca.cardiff.ac.uk/view/cardiffauthors/A048848V.html orcid:0000-0002-7533-4430 orcid:0000-0002-7533-4430 and Pollard, David 2012. Exploring uncertainties in the relationship between temperature, ice volume, and sea level over the past 50 million years. Reviews of Geophysics 50 (1) , RG1005. 10.1029/2011RG000358 https://doi.org/10.1029/2011RG000358 file https://orca.cardiff.ac.uk/19781/1/Gasson%202012.pdf doi:10.1029/2011RG000358 |
op_doi |
https://doi.org/10.1029/2011RG000358 |
container_title |
Reviews of Geophysics |
container_volume |
50 |
container_issue |
1 |
_version_ |
1766125850688749568 |