The MMCO-EOT conundrum:Same benthic δ 18 O, different CO 2
Knowledge on climate change during the Cenozoic largely stems from benthic δ 18 O records, which document combined effects of deep-sea temperature and ice volume. Information on CO 2 is expanding but remains uncertain and intermittent. Attempts to reconcile δ 18 O, sea level, and CO 2 by studying pr...
Published in: | Paleoceanography |
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Language: | English |
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2016
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Online Access: | https://research.vu.nl/en/publications/5c2e6dff-cbbd-4dc4-8c6a-42b458acd544 https://doi.org/10.1002/2016PA002958 https://hdl.handle.net/1871.1/5c2e6dff-cbbd-4dc4-8c6a-42b458acd544 http://www.scopus.com/inward/record.url?scp=84988628736&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=84988628736&partnerID=8YFLogxK |
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ftvuamstcris:oai:research.vu.nl:publications/5c2e6dff-cbbd-4dc4-8c6a-42b458acd544 2024-06-23T07:47:38+00:00 The MMCO-EOT conundrum:Same benthic δ 18 O, different CO 2 Stap, Lennert B. van de Wal, Roderik S.W. De Boer, Bas Bintanja, Richard Lourens, Lucas J. 2016-09-01 https://research.vu.nl/en/publications/5c2e6dff-cbbd-4dc4-8c6a-42b458acd544 https://doi.org/10.1002/2016PA002958 https://hdl.handle.net/1871.1/5c2e6dff-cbbd-4dc4-8c6a-42b458acd544 http://www.scopus.com/inward/record.url?scp=84988628736&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=84988628736&partnerID=8YFLogxK eng eng https://research.vu.nl/en/publications/5c2e6dff-cbbd-4dc4-8c6a-42b458acd544 info:eu-repo/semantics/restrictedAccess Stap , L B , van de Wal , R S W , De Boer , B , Bintanja , R & Lourens , L J 2016 , ' The MMCO-EOT conundrum : Same benthic δ 18 O, different CO 2 ' , Paleoceanography , vol. 31 , no. 9 , pp. 1270-1282 . https://doi.org/10.1002/2016PA002958 benthic oxygen isotopes carbon dioxide global climate global ice volume paleoclimate sea level /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2016 ftvuamstcris https://doi.org/10.1002/2016PA002958 2024-06-06T00:14:55Z Knowledge on climate change during the Cenozoic largely stems from benthic δ 18 O records, which document combined effects of deep-sea temperature and ice volume. Information on CO 2 is expanding but remains uncertain and intermittent. Attempts to reconcile δ 18 O, sea level, and CO 2 by studying proxy data suffer from paucity of data and apparent inconsistencies among different records. One outstanding issue is the difference suggested by proxy CO 2 data between the Eocene-Oligocene boundary (EOT) and the Middle-Miocene Climatic Optimum (MMCO), while similar levels of δ 18 O are shown during these times. This conundrum implies changing relations between δ 18 O, CO 2 , and temperature over time. Here we use a coupled climate-ice sheet model, forced by two different benthic δ 18 O records, to obtain continuous and mutually consistent records of δ 18 O, CO 2 , temperature, and sea level over the period 38 to 10 Myr ago. We show that the different CO 2 levels between the EOT and MMCO can be explained neither by the standard configuration of our model nor by altering the uncertain ablation parametrization on the East Antarctic Ice Sheet. However, we offer an explanation for the MMCO-EOT conundrum by considering erosion and/or tectonic movement of Antarctica, letting the topography evolve over time. A decreasing height of the Antarctic continent leads to higher surface temperatures, reducing the CO 2 needed to maintain the same ice volume. This also leads to an increasing contribution of ice volume to the δ 18 O signal. This result is, however, dependent on how the topographic changes are implemented in our ice sheet model. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Vrije Universiteit Amsterdam (VU): Research Portal Antarctic East Antarctic Ice Sheet The Antarctic Paleoceanography 31 9 1270 1282 |
institution |
Open Polar |
collection |
Vrije Universiteit Amsterdam (VU): Research Portal |
op_collection_id |
ftvuamstcris |
language |
English |
topic |
benthic oxygen isotopes carbon dioxide global climate global ice volume paleoclimate sea level /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
spellingShingle |
benthic oxygen isotopes carbon dioxide global climate global ice volume paleoclimate sea level /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Stap, Lennert B. van de Wal, Roderik S.W. De Boer, Bas Bintanja, Richard Lourens, Lucas J. The MMCO-EOT conundrum:Same benthic δ 18 O, different CO 2 |
topic_facet |
benthic oxygen isotopes carbon dioxide global climate global ice volume paleoclimate sea level /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
Knowledge on climate change during the Cenozoic largely stems from benthic δ 18 O records, which document combined effects of deep-sea temperature and ice volume. Information on CO 2 is expanding but remains uncertain and intermittent. Attempts to reconcile δ 18 O, sea level, and CO 2 by studying proxy data suffer from paucity of data and apparent inconsistencies among different records. One outstanding issue is the difference suggested by proxy CO 2 data between the Eocene-Oligocene boundary (EOT) and the Middle-Miocene Climatic Optimum (MMCO), while similar levels of δ 18 O are shown during these times. This conundrum implies changing relations between δ 18 O, CO 2 , and temperature over time. Here we use a coupled climate-ice sheet model, forced by two different benthic δ 18 O records, to obtain continuous and mutually consistent records of δ 18 O, CO 2 , temperature, and sea level over the period 38 to 10 Myr ago. We show that the different CO 2 levels between the EOT and MMCO can be explained neither by the standard configuration of our model nor by altering the uncertain ablation parametrization on the East Antarctic Ice Sheet. However, we offer an explanation for the MMCO-EOT conundrum by considering erosion and/or tectonic movement of Antarctica, letting the topography evolve over time. A decreasing height of the Antarctic continent leads to higher surface temperatures, reducing the CO 2 needed to maintain the same ice volume. This also leads to an increasing contribution of ice volume to the δ 18 O signal. This result is, however, dependent on how the topographic changes are implemented in our ice sheet model. |
format |
Article in Journal/Newspaper |
author |
Stap, Lennert B. van de Wal, Roderik S.W. De Boer, Bas Bintanja, Richard Lourens, Lucas J. |
author_facet |
Stap, Lennert B. van de Wal, Roderik S.W. De Boer, Bas Bintanja, Richard Lourens, Lucas J. |
author_sort |
Stap, Lennert B. |
title |
The MMCO-EOT conundrum:Same benthic δ 18 O, different CO 2 |
title_short |
The MMCO-EOT conundrum:Same benthic δ 18 O, different CO 2 |
title_full |
The MMCO-EOT conundrum:Same benthic δ 18 O, different CO 2 |
title_fullStr |
The MMCO-EOT conundrum:Same benthic δ 18 O, different CO 2 |
title_full_unstemmed |
The MMCO-EOT conundrum:Same benthic δ 18 O, different CO 2 |
title_sort |
mmco-eot conundrum:same benthic δ 18 o, different co 2 |
publishDate |
2016 |
url |
https://research.vu.nl/en/publications/5c2e6dff-cbbd-4dc4-8c6a-42b458acd544 https://doi.org/10.1002/2016PA002958 https://hdl.handle.net/1871.1/5c2e6dff-cbbd-4dc4-8c6a-42b458acd544 http://www.scopus.com/inward/record.url?scp=84988628736&partnerID=8YFLogxK http://www.scopus.com/inward/citedby.url?scp=84988628736&partnerID=8YFLogxK |
geographic |
Antarctic East Antarctic Ice Sheet The Antarctic |
geographic_facet |
Antarctic East Antarctic Ice Sheet The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_source |
Stap , L B , van de Wal , R S W , De Boer , B , Bintanja , R & Lourens , L J 2016 , ' The MMCO-EOT conundrum : Same benthic δ 18 O, different CO 2 ' , Paleoceanography , vol. 31 , no. 9 , pp. 1270-1282 . https://doi.org/10.1002/2016PA002958 |
op_relation |
https://research.vu.nl/en/publications/5c2e6dff-cbbd-4dc4-8c6a-42b458acd544 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1002/2016PA002958 |
container_title |
Paleoceanography |
container_volume |
31 |
container_issue |
9 |
container_start_page |
1270 |
op_container_end_page |
1282 |
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1802651772407250944 |