Comparing the impacts of Miocene–Pliocene changes in inter-ocean gateways on climate: Central American Seaway, Bering Strait, and Indonesia
Changes in inter-ocean gateways caused by tectonic processes have been long considered an important factor in climate evolution on geological timescales. Three major gateway changes that occurred during the Late Miocene and Pliocene epochs are the closing of the Central American Seaway (CAS) by the...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:1500958 2023-12-24T10:15:33+01:00 Comparing the impacts of Miocene–Pliocene changes in inter-ocean gateways on climate: Central American Seaway, Bering Strait, and Indonesia Brierley, CM Fedorov, AV 2016-06-15 text https://discovery.ucl.ac.uk/id/eprint/1500958/1/Gateways_Rev2_avf.accptd.pdf https://discovery.ucl.ac.uk/id/eprint/1500958/ eng eng https://discovery.ucl.ac.uk/id/eprint/1500958/1/Gateways_Rev2_avf.accptd.pdf https://discovery.ucl.ac.uk/id/eprint/1500958/ open Earth and Planetary Science Letters , 444 pp. 116-130. (2016) gateways Bering Panama onset glaciation paleoclimate Article 2016 ftucl 2023-11-27T13:07:39Z Changes in inter-ocean gateways caused by tectonic processes have been long considered an important factor in climate evolution on geological timescales. Three major gateway changes that occurred during the Late Miocene and Pliocene epochs are the closing of the Central American Seaway (CAS) by the uplift of the Isthmus of Panama, the opening of the Bering Strait, and the closing of a deep channel between New Guinea and the Equator. This study compares the global climatic effects of these changes within the same climate model framework. We find that the closure of the CAS and the opening of the Bering Strait induce the strongest effects on the Atlantic meridional overturning circulation (AMOC). However, these effects potentially compensate, as the closure of the CAS and the opening of the Bering Strait cause similar AMOC changes of around 2 Sv (strengthening and weakening respectively). Previous simulations with an open CAS consistently simulated colder oceanic conditions in the Northern Hemisphere – contrasting with the evidence for warmer sea surface temperatures 10–3 million years ago. Here we argue that this cooling is overestimated because (a) the models typically simulated too strong an AMOC change not yet in equilibrium, (b) used a channel too deep and (c) lacked the compensating effect of the closed Bering Strait – a factor frequently ignored despite its potential influence on northern high latitudes and ice-sheet growth. Further, we discuss how these gateway changes affect various climatic variables from surface temperature and precipitation to ENSO characteristics. Article in Journal/Newspaper Bering Strait Ice Sheet University College London: UCL Discovery Bering Strait |
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Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
topic |
gateways Bering Panama onset glaciation paleoclimate |
spellingShingle |
gateways Bering Panama onset glaciation paleoclimate Brierley, CM Fedorov, AV Comparing the impacts of Miocene–Pliocene changes in inter-ocean gateways on climate: Central American Seaway, Bering Strait, and Indonesia |
topic_facet |
gateways Bering Panama onset glaciation paleoclimate |
description |
Changes in inter-ocean gateways caused by tectonic processes have been long considered an important factor in climate evolution on geological timescales. Three major gateway changes that occurred during the Late Miocene and Pliocene epochs are the closing of the Central American Seaway (CAS) by the uplift of the Isthmus of Panama, the opening of the Bering Strait, and the closing of a deep channel between New Guinea and the Equator. This study compares the global climatic effects of these changes within the same climate model framework. We find that the closure of the CAS and the opening of the Bering Strait induce the strongest effects on the Atlantic meridional overturning circulation (AMOC). However, these effects potentially compensate, as the closure of the CAS and the opening of the Bering Strait cause similar AMOC changes of around 2 Sv (strengthening and weakening respectively). Previous simulations with an open CAS consistently simulated colder oceanic conditions in the Northern Hemisphere – contrasting with the evidence for warmer sea surface temperatures 10–3 million years ago. Here we argue that this cooling is overestimated because (a) the models typically simulated too strong an AMOC change not yet in equilibrium, (b) used a channel too deep and (c) lacked the compensating effect of the closed Bering Strait – a factor frequently ignored despite its potential influence on northern high latitudes and ice-sheet growth. Further, we discuss how these gateway changes affect various climatic variables from surface temperature and precipitation to ENSO characteristics. |
format |
Article in Journal/Newspaper |
author |
Brierley, CM Fedorov, AV |
author_facet |
Brierley, CM Fedorov, AV |
author_sort |
Brierley, CM |
title |
Comparing the impacts of Miocene–Pliocene changes in inter-ocean gateways on climate: Central American Seaway, Bering Strait, and Indonesia |
title_short |
Comparing the impacts of Miocene–Pliocene changes in inter-ocean gateways on climate: Central American Seaway, Bering Strait, and Indonesia |
title_full |
Comparing the impacts of Miocene–Pliocene changes in inter-ocean gateways on climate: Central American Seaway, Bering Strait, and Indonesia |
title_fullStr |
Comparing the impacts of Miocene–Pliocene changes in inter-ocean gateways on climate: Central American Seaway, Bering Strait, and Indonesia |
title_full_unstemmed |
Comparing the impacts of Miocene–Pliocene changes in inter-ocean gateways on climate: Central American Seaway, Bering Strait, and Indonesia |
title_sort |
comparing the impacts of miocene–pliocene changes in inter-ocean gateways on climate: central american seaway, bering strait, and indonesia |
publishDate |
2016 |
url |
https://discovery.ucl.ac.uk/id/eprint/1500958/1/Gateways_Rev2_avf.accptd.pdf https://discovery.ucl.ac.uk/id/eprint/1500958/ |
geographic |
Bering Strait |
geographic_facet |
Bering Strait |
genre |
Bering Strait Ice Sheet |
genre_facet |
Bering Strait Ice Sheet |
op_source |
Earth and Planetary Science Letters , 444 pp. 116-130. (2016) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/1500958/1/Gateways_Rev2_avf.accptd.pdf https://discovery.ucl.ac.uk/id/eprint/1500958/ |
op_rights |
open |
_version_ |
1786202484869431296 |