Modelling ice sheet evolution and atmospheric CO 2 during the Late Pliocene
In order to investigate the relation between ice sheets and climate in a warmer-than-present world, recent research has focussed on the Late Pliocene, 3.6 to 2.58 million years ago. It is the most recent period in Earth's history when such a warm climate state existed for a significant duration...
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ftdoajarticles:oai:doaj.org/article:c8707378aeb64464bf43520f8a2de81b 2023-05-15T16:39:19+02:00 Modelling ice sheet evolution and atmospheric CO 2 during the Late Pliocene C. J. Berends B. de Boer A. M. Dolan D. J. Hill R. S. W. van de Wal 2019-08-01T00:00:00Z https://doi.org/10.5194/cp-15-1603-2019 https://doaj.org/article/c8707378aeb64464bf43520f8a2de81b EN eng Copernicus Publications https://www.clim-past.net/15/1603/2019/cp-15-1603-2019.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-15-1603-2019 1814-9324 1814-9332 https://doaj.org/article/c8707378aeb64464bf43520f8a2de81b Climate of the Past, Vol 15, Pp 1603-1619 (2019) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2019 ftdoajarticles https://doi.org/10.5194/cp-15-1603-2019 2022-12-31T05:35:58Z In order to investigate the relation between ice sheets and climate in a warmer-than-present world, recent research has focussed on the Late Pliocene, 3.6 to 2.58 million years ago. It is the most recent period in Earth's history when such a warm climate state existed for a significant duration of time. Marine Isotope Stage (MIS) M2 ( ∼3.3 Myr ago) is a strong positive excursion in benthic oxygen records in the middle of the otherwise warm and relatively stable Late Pliocene. However, the relative contributions to the benthic δ 18 O signal from deep ocean cooling and growing ice sheets are still uncertain. Here, we present results from simulations of the Late Pliocene with a hybrid ice-sheet–climate model, showing a reconstruction of ice sheet geometry, sea level and atmospheric CO 2 . Initial experiments simulating the last four glacial cycles indicate that this model yields results which are in good agreement with proxy records in terms of global mean sea level, benthic oxygen isotope abundance, ice-core-derived surface temperature and atmospheric CO 2 concentration. For the Late Pliocene, our results show an atmospheric CO 2 concentration during MIS M2 of 233–249 ppmv and a drop in global mean sea level of 10 to 25 m. Uncertainties are larger during the warmer periods leading up to and following MIS M2. CO 2 concentrations during the warm intervals in the Pliocene, with sea-level high stands of 8–14 m above the present day, varied between 320 and 400 ppmv, lower than indicated by some proxy records but in line with earlier model reconstructions. Article in Journal/Newspaper ice core Ice Sheet Directory of Open Access Journals: DOAJ Articles Climate of the Past 15 4 1603 1619 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 C. J. Berends B. de Boer A. M. Dolan D. J. Hill R. S. W. van de Wal Modelling ice sheet evolution and atmospheric CO 2 during the Late Pliocene |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
In order to investigate the relation between ice sheets and climate in a warmer-than-present world, recent research has focussed on the Late Pliocene, 3.6 to 2.58 million years ago. It is the most recent period in Earth's history when such a warm climate state existed for a significant duration of time. Marine Isotope Stage (MIS) M2 ( ∼3.3 Myr ago) is a strong positive excursion in benthic oxygen records in the middle of the otherwise warm and relatively stable Late Pliocene. However, the relative contributions to the benthic δ 18 O signal from deep ocean cooling and growing ice sheets are still uncertain. Here, we present results from simulations of the Late Pliocene with a hybrid ice-sheet–climate model, showing a reconstruction of ice sheet geometry, sea level and atmospheric CO 2 . Initial experiments simulating the last four glacial cycles indicate that this model yields results which are in good agreement with proxy records in terms of global mean sea level, benthic oxygen isotope abundance, ice-core-derived surface temperature and atmospheric CO 2 concentration. For the Late Pliocene, our results show an atmospheric CO 2 concentration during MIS M2 of 233–249 ppmv and a drop in global mean sea level of 10 to 25 m. Uncertainties are larger during the warmer periods leading up to and following MIS M2. CO 2 concentrations during the warm intervals in the Pliocene, with sea-level high stands of 8–14 m above the present day, varied between 320 and 400 ppmv, lower than indicated by some proxy records but in line with earlier model reconstructions. |
format |
Article in Journal/Newspaper |
author |
C. J. Berends B. de Boer A. M. Dolan D. J. Hill R. S. W. van de Wal |
author_facet |
C. J. Berends B. de Boer A. M. Dolan D. J. Hill R. S. W. van de Wal |
author_sort |
C. J. Berends |
title |
Modelling ice sheet evolution and atmospheric CO 2 during the Late Pliocene |
title_short |
Modelling ice sheet evolution and atmospheric CO 2 during the Late Pliocene |
title_full |
Modelling ice sheet evolution and atmospheric CO 2 during the Late Pliocene |
title_fullStr |
Modelling ice sheet evolution and atmospheric CO 2 during the Late Pliocene |
title_full_unstemmed |
Modelling ice sheet evolution and atmospheric CO 2 during the Late Pliocene |
title_sort |
modelling ice sheet evolution and atmospheric co 2 during the late pliocene |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/cp-15-1603-2019 https://doaj.org/article/c8707378aeb64464bf43520f8a2de81b |
genre |
ice core Ice Sheet |
genre_facet |
ice core Ice Sheet |
op_source |
Climate of the Past, Vol 15, Pp 1603-1619 (2019) |
op_relation |
https://www.clim-past.net/15/1603/2019/cp-15-1603-2019.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-15-1603-2019 1814-9324 1814-9332 https://doaj.org/article/c8707378aeb64464bf43520f8a2de81b |
op_doi |
https://doi.org/10.5194/cp-15-1603-2019 |
container_title |
Climate of the Past |
container_volume |
15 |
container_issue |
4 |
container_start_page |
1603 |
op_container_end_page |
1619 |
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