A continuous simulation of global ice volume over the past 1 million years with 3-D ice-sheet models
Sea-level records show large glacial-interglacial changes over the past million years, which on these time scales are related to changes of ice volume on land. During the Pleistocene, sea-level changes induced by ice volume are largely caused by the waxing and waning of the large ice sheets in the N...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/278462 2023-07-23T04:15:48+02:00 A continuous simulation of global ice volume over the past 1 million years with 3-D ice-sheet models de Boer, B. van de Wal, R.S.W. Lourens, L.J. Bintanja, R. Reerink, T.J. Marine and Atmospheric Research Stratigraphy & paleontology Sub Dynamics Meteorology Dep Natuurkunde Stratigraphy and paleontology 2013 application/pdf https://dspace.library.uu.nl/handle/1874/278462 en eng 0930-7575 https://dspace.library.uu.nl/handle/1874/278462 info:eu-repo/semantics/EmbargoedAccess Article 2013 ftunivutrecht 2023-07-02T00:43:36Z Sea-level records show large glacial-interglacial changes over the past million years, which on these time scales are related to changes of ice volume on land. During the Pleistocene, sea-level changes induced by ice volume are largely caused by the waxing and waning of the large ice sheets in the Northern Hemisphere. However, the individual contributions of ice in the Northern and Southern Hemisphere are poorly constrained. In this study, for the first time a fully coupled system of four 3-D ice-sheet models is used, simulating glaciations on Eurasia, North America, Greenland and Antarctica. The ice-sheet models use a combination of the shallow ice and shelf approximations to determine sheet, shelf and sliding velocities. The framework consists of an inverse forward modelling approach to derive a self-consistent record of temperature and ice volume from deep-sea benthic d18O data over the past 1 million years, a proxy for ice volume and temperature. It is shown that for both eustatic sea level and sea water d18O changes, the Eurasian and North American ice sheets are responsible for the largest part of the variability. The combined contribution of the Antarctic and Greenland ice sheets is about 10 % for sea level and about 20 % for sea water d18O during glacial maxima. However, changes in interglacials are mainly caused by melt of the Greenland and Antarctic ice sheets, with an average time lag of 4 kyr between melt and temperature. Furthermore, we have tested the separate response to changes in temperature and sea level for each ice sheet, indicating that ice volume can be significantly influenced by changes in eustatic sea level alone. Hence, showing the importance of a simultaneous simulation of all four ice sheets. This paper describes the first complete simulation of global ice-volume variations over the late Pleistocene with the possibility to model changes above and below present-day ice volume, constrained by observations of benthic d18O proxy data. Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland Ice Sheet Utrecht University Repository Antarctic Greenland The Antarctic |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
description |
Sea-level records show large glacial-interglacial changes over the past million years, which on these time scales are related to changes of ice volume on land. During the Pleistocene, sea-level changes induced by ice volume are largely caused by the waxing and waning of the large ice sheets in the Northern Hemisphere. However, the individual contributions of ice in the Northern and Southern Hemisphere are poorly constrained. In this study, for the first time a fully coupled system of four 3-D ice-sheet models is used, simulating glaciations on Eurasia, North America, Greenland and Antarctica. The ice-sheet models use a combination of the shallow ice and shelf approximations to determine sheet, shelf and sliding velocities. The framework consists of an inverse forward modelling approach to derive a self-consistent record of temperature and ice volume from deep-sea benthic d18O data over the past 1 million years, a proxy for ice volume and temperature. It is shown that for both eustatic sea level and sea water d18O changes, the Eurasian and North American ice sheets are responsible for the largest part of the variability. The combined contribution of the Antarctic and Greenland ice sheets is about 10 % for sea level and about 20 % for sea water d18O during glacial maxima. However, changes in interglacials are mainly caused by melt of the Greenland and Antarctic ice sheets, with an average time lag of 4 kyr between melt and temperature. Furthermore, we have tested the separate response to changes in temperature and sea level for each ice sheet, indicating that ice volume can be significantly influenced by changes in eustatic sea level alone. Hence, showing the importance of a simultaneous simulation of all four ice sheets. This paper describes the first complete simulation of global ice-volume variations over the late Pleistocene with the possibility to model changes above and below present-day ice volume, constrained by observations of benthic d18O proxy data. |
author2 |
Marine and Atmospheric Research Stratigraphy & paleontology Sub Dynamics Meteorology Dep Natuurkunde Stratigraphy and paleontology |
format |
Article in Journal/Newspaper |
author |
de Boer, B. van de Wal, R.S.W. Lourens, L.J. Bintanja, R. Reerink, T.J. |
spellingShingle |
de Boer, B. van de Wal, R.S.W. Lourens, L.J. Bintanja, R. Reerink, T.J. A continuous simulation of global ice volume over the past 1 million years with 3-D ice-sheet models |
author_facet |
de Boer, B. van de Wal, R.S.W. Lourens, L.J. Bintanja, R. Reerink, T.J. |
author_sort |
de Boer, B. |
title |
A continuous simulation of global ice volume over the past 1 million years with 3-D ice-sheet models |
title_short |
A continuous simulation of global ice volume over the past 1 million years with 3-D ice-sheet models |
title_full |
A continuous simulation of global ice volume over the past 1 million years with 3-D ice-sheet models |
title_fullStr |
A continuous simulation of global ice volume over the past 1 million years with 3-D ice-sheet models |
title_full_unstemmed |
A continuous simulation of global ice volume over the past 1 million years with 3-D ice-sheet models |
title_sort |
continuous simulation of global ice volume over the past 1 million years with 3-d ice-sheet models |
publishDate |
2013 |
url |
https://dspace.library.uu.nl/handle/1874/278462 |
geographic |
Antarctic Greenland The Antarctic |
geographic_facet |
Antarctic Greenland The Antarctic |
genre |
Antarc* Antarctic Antarctica Greenland Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Greenland Ice Sheet |
op_relation |
0930-7575 https://dspace.library.uu.nl/handle/1874/278462 |
op_rights |
info:eu-repo/semantics/EmbargoedAccess |
_version_ |
1772176835040247808 |