Modelling ice sheet evolution and atmospheric CO2 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...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
European Geosciences Union
2019
|
Subjects: | |
Online Access: | https://eprints.whiterose.ac.uk/150795/ https://eprints.whiterose.ac.uk/150795/3/cp-15-1603-2019.pdf |
id |
ftleedsuniv:oai:eprints.whiterose.ac.uk:150795 |
---|---|
record_format |
openpolar |
spelling |
ftleedsuniv:oai:eprints.whiterose.ac.uk:150795 2023-05-15T16:39:17+02:00 Modelling ice sheet evolution and atmospheric CO2 during the Late Pliocene Berends, CJ de Boer, B Dolan, AM Hill, DJ van de Wal, RSW 2019-08-15 text https://eprints.whiterose.ac.uk/150795/ https://eprints.whiterose.ac.uk/150795/3/cp-15-1603-2019.pdf en eng European Geosciences Union https://eprints.whiterose.ac.uk/150795/3/cp-15-1603-2019.pdf Berends, CJ, de Boer, B, Dolan, AM orcid.org/0000-0002-9585-9648 et al. (2 more authors) (2019) Modelling ice sheet evolution and atmospheric CO2 during the Late Pliocene. Climate of the Past, 15 (4). pp. 1603-1619. ISSN 1814-9324 cc_by_4 CC-BY Article NonPeerReviewed 2019 ftleedsuniv 2023-01-30T22:22:20Z 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 δ18O 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 CO2. 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 CO2 concentration. For the Late Pliocene, our results show an atmospheric CO2 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. CO2 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 White Rose Research Online (Universities of Leeds, Sheffield & York) |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
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 δ18O 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 CO2. 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 CO2 concentration. For the Late Pliocene, our results show an atmospheric CO2 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. CO2 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 |
Berends, CJ de Boer, B Dolan, AM Hill, DJ van de Wal, RSW |
spellingShingle |
Berends, CJ de Boer, B Dolan, AM Hill, DJ van de Wal, RSW Modelling ice sheet evolution and atmospheric CO2 during the Late Pliocene |
author_facet |
Berends, CJ de Boer, B Dolan, AM Hill, DJ van de Wal, RSW |
author_sort |
Berends, CJ |
title |
Modelling ice sheet evolution and atmospheric CO2 during the Late Pliocene |
title_short |
Modelling ice sheet evolution and atmospheric CO2 during the Late Pliocene |
title_full |
Modelling ice sheet evolution and atmospheric CO2 during the Late Pliocene |
title_fullStr |
Modelling ice sheet evolution and atmospheric CO2 during the Late Pliocene |
title_full_unstemmed |
Modelling ice sheet evolution and atmospheric CO2 during the Late Pliocene |
title_sort |
modelling ice sheet evolution and atmospheric co2 during the late pliocene |
publisher |
European Geosciences Union |
publishDate |
2019 |
url |
https://eprints.whiterose.ac.uk/150795/ https://eprints.whiterose.ac.uk/150795/3/cp-15-1603-2019.pdf |
genre |
ice core Ice Sheet |
genre_facet |
ice core Ice Sheet |
op_relation |
https://eprints.whiterose.ac.uk/150795/3/cp-15-1603-2019.pdf Berends, CJ, de Boer, B, Dolan, AM orcid.org/0000-0002-9585-9648 et al. (2 more authors) (2019) Modelling ice sheet evolution and atmospheric CO2 during the Late Pliocene. Climate of the Past, 15 (4). pp. 1603-1619. ISSN 1814-9324 |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
_version_ |
1766029611168169984 |