The role of ocean gateways on cooling climate on long time scales
We examine ocean changes in response to changes in paleogeography from the Cretaceous to present in an intermediate complexity model and in the fully coupled CCSM3 model. Greenhouse gas concentrations are kept constant to allow a focus on effects arising from changing continental configurations. We...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/306096 2023-11-12T04:06:18+01:00 The role of ocean gateways on cooling climate on long time scales Sijp, Willem P. von der Heydt, Anna S. Dijkstra, Henk A. Floegel, Sascha Douglas, Peter M. J. Bijl, Peter K. Sub Physical Oceanography Marine palynology and palaeoceanography Marine and Atmospheric Research Marine Palynology 2014-08 application/pdf https://dspace.library.uu.nl/handle/1874/306096 en eng 0921-8181 https://dspace.library.uu.nl/handle/1874/306096 info:eu-repo/semantics/OpenAccess Eocene Cenozoic cooling trend deep ocean cooling ocean gateways thermal isolation ocean circulation Eocene/Oligocene transition Deep time climate model Polar amplification Cloud feedbacks overturning circulation AMOC THC greenhouse climate icehouse climate polar warmth ANTARCTIC CIRCUMPOLAR CURRENT ATMOSPHERIC CARBON-DIOXIDE SEA-SURFACE TEMPERATURES BENTHIC FORAMINIFERAL MG/CA SOUTHWEST PACIFIC-OCEAN NORTHERN HIGH-LATITUDES STABLE-ISOTOPE RECORDS DRAKE PASSAGE GATEWAY DEEP-WATER PRODUCTION EARLY EOCENE Article 2014 ftunivutrecht 2023-11-01T23:12:40Z We examine ocean changes in response to changes in paleogeography from the Cretaceous to present in an intermediate complexity model and in the fully coupled CCSM3 model. Greenhouse gas concentrations are kept constant to allow a focus on effects arising from changing continental configurations. We find consistent and significant geography-related Cenozoic cooling arising from the opening of Southern Ocean (SO) gateways. Both models show significant deep ocean cooling arising from tectonic evolution alone. Simulations employing continental configurations associated with greenhouse climates, namely the Turonian and the Eocene simulations, systematically exhibit warm deep ocean temperatures at elevated pCO(2) close to 10 degrees C. In contrast, continental configurations associated with (later) icehouse climates are associated with cooler deep ocean temperatures at identical pCO(2), arising from a progressive strengthening of the Antarctic Circumpolar Current. This suggests that a component of the Cenozoic benthic cooling trend recorded in oxygen isotopes could arise directly from changes in continental configuration, and so be partially decoupled from the Cenozoic greenhouse gas history. In this paper we will present our model results against the background of an extensive review of previous work on ocean gateways and additional modelling results from several other global climate models. (C) 2014 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic Drake Passage Southern Ocean Utrecht University Repository Antarctic Drake Passage Pacific Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Eocene Cenozoic cooling trend deep ocean cooling ocean gateways thermal isolation ocean circulation Eocene/Oligocene transition Deep time climate model Polar amplification Cloud feedbacks overturning circulation AMOC THC greenhouse climate icehouse climate polar warmth ANTARCTIC CIRCUMPOLAR CURRENT ATMOSPHERIC CARBON-DIOXIDE SEA-SURFACE TEMPERATURES BENTHIC FORAMINIFERAL MG/CA SOUTHWEST PACIFIC-OCEAN NORTHERN HIGH-LATITUDES STABLE-ISOTOPE RECORDS DRAKE PASSAGE GATEWAY DEEP-WATER PRODUCTION EARLY EOCENE |
spellingShingle |
Eocene Cenozoic cooling trend deep ocean cooling ocean gateways thermal isolation ocean circulation Eocene/Oligocene transition Deep time climate model Polar amplification Cloud feedbacks overturning circulation AMOC THC greenhouse climate icehouse climate polar warmth ANTARCTIC CIRCUMPOLAR CURRENT ATMOSPHERIC CARBON-DIOXIDE SEA-SURFACE TEMPERATURES BENTHIC FORAMINIFERAL MG/CA SOUTHWEST PACIFIC-OCEAN NORTHERN HIGH-LATITUDES STABLE-ISOTOPE RECORDS DRAKE PASSAGE GATEWAY DEEP-WATER PRODUCTION EARLY EOCENE Sijp, Willem P. von der Heydt, Anna S. Dijkstra, Henk A. Floegel, Sascha Douglas, Peter M. J. Bijl, Peter K. The role of ocean gateways on cooling climate on long time scales |
topic_facet |
Eocene Cenozoic cooling trend deep ocean cooling ocean gateways thermal isolation ocean circulation Eocene/Oligocene transition Deep time climate model Polar amplification Cloud feedbacks overturning circulation AMOC THC greenhouse climate icehouse climate polar warmth ANTARCTIC CIRCUMPOLAR CURRENT ATMOSPHERIC CARBON-DIOXIDE SEA-SURFACE TEMPERATURES BENTHIC FORAMINIFERAL MG/CA SOUTHWEST PACIFIC-OCEAN NORTHERN HIGH-LATITUDES STABLE-ISOTOPE RECORDS DRAKE PASSAGE GATEWAY DEEP-WATER PRODUCTION EARLY EOCENE |
description |
We examine ocean changes in response to changes in paleogeography from the Cretaceous to present in an intermediate complexity model and in the fully coupled CCSM3 model. Greenhouse gas concentrations are kept constant to allow a focus on effects arising from changing continental configurations. We find consistent and significant geography-related Cenozoic cooling arising from the opening of Southern Ocean (SO) gateways. Both models show significant deep ocean cooling arising from tectonic evolution alone. Simulations employing continental configurations associated with greenhouse climates, namely the Turonian and the Eocene simulations, systematically exhibit warm deep ocean temperatures at elevated pCO(2) close to 10 degrees C. In contrast, continental configurations associated with (later) icehouse climates are associated with cooler deep ocean temperatures at identical pCO(2), arising from a progressive strengthening of the Antarctic Circumpolar Current. This suggests that a component of the Cenozoic benthic cooling trend recorded in oxygen isotopes could arise directly from changes in continental configuration, and so be partially decoupled from the Cenozoic greenhouse gas history. In this paper we will present our model results against the background of an extensive review of previous work on ocean gateways and additional modelling results from several other global climate models. (C) 2014 Elsevier B.V. All rights reserved. |
author2 |
Sub Physical Oceanography Marine palynology and palaeoceanography Marine and Atmospheric Research Marine Palynology |
format |
Article in Journal/Newspaper |
author |
Sijp, Willem P. von der Heydt, Anna S. Dijkstra, Henk A. Floegel, Sascha Douglas, Peter M. J. Bijl, Peter K. |
author_facet |
Sijp, Willem P. von der Heydt, Anna S. Dijkstra, Henk A. Floegel, Sascha Douglas, Peter M. J. Bijl, Peter K. |
author_sort |
Sijp, Willem P. |
title |
The role of ocean gateways on cooling climate on long time scales |
title_short |
The role of ocean gateways on cooling climate on long time scales |
title_full |
The role of ocean gateways on cooling climate on long time scales |
title_fullStr |
The role of ocean gateways on cooling climate on long time scales |
title_full_unstemmed |
The role of ocean gateways on cooling climate on long time scales |
title_sort |
role of ocean gateways on cooling climate on long time scales |
publishDate |
2014 |
url |
https://dspace.library.uu.nl/handle/1874/306096 |
geographic |
Antarctic Drake Passage Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Drake Passage Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_relation |
0921-8181 https://dspace.library.uu.nl/handle/1874/306096 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782327401615720448 |