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Improved Model‐Data Agreement With Strongly Eddying Ocean Simulations in the Middle‐Late Eocene

Model simulations of past climates are increasingly found to compare well with proxy data at a global scale, but regional discrepancies remain. A persistent issue in modeling past greenhouse climates has been the temperature difference between equatorial and (sub‐)polar regions, which is typically m...

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Autores principales: Nooteboom, Peter D., Baatsen, Michiel, Bijl, Peter K., Kliphuis, Michael A., van Sebille, Erik, Sluijs, Appy, Dijkstra, Henk A., von der Heydt, Anna S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9540656/
https://www.ncbi.nlm.nih.gov/pubmed/36248180
http://dx.doi.org/10.1029/2021PA004405
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author Nooteboom, Peter D.
Baatsen, Michiel
Bijl, Peter K.
Kliphuis, Michael A.
van Sebille, Erik
Sluijs, Appy
Dijkstra, Henk A.
von der Heydt, Anna S.
author_facet Nooteboom, Peter D.
Baatsen, Michiel
Bijl, Peter K.
Kliphuis, Michael A.
van Sebille, Erik
Sluijs, Appy
Dijkstra, Henk A.
von der Heydt, Anna S.
author_sort Nooteboom, Peter D.
collection PubMed
description Model simulations of past climates are increasingly found to compare well with proxy data at a global scale, but regional discrepancies remain. A persistent issue in modeling past greenhouse climates has been the temperature difference between equatorial and (sub‐)polar regions, which is typically much larger in simulations than proxy data suggest. Particularly in the Eocene, multiple temperature proxies suggest extreme warmth in the southwest Pacific Ocean, where model simulations consistently suggest temperate conditions. Here, we present new global ocean model simulations at 0.1° horizontal resolution for the middle‐late Eocene. The eddies in the high‐resolution model affect poleward heat transport and local time‐mean flow in critical regions compared to the noneddying flow in the standard low‐resolution simulations. As a result, the high‐resolution simulations produce higher surface temperatures near Antarctica and lower surface temperatures near the equator compared to the low‐resolution simulations, leading to better correspondence with proxy reconstructions. Crucially, the high‐resolution simulations are also much more consistent with biogeographic patterns in endemic‐Antarctic and low‐latitude‐derived plankton, and thus resolve the long‐standing discrepancy of warm subpolar ocean temperatures and isolating polar gyre circulation. The results imply that strongly eddying model simulations are required to reconcile discrepancies between regional proxy data and models, and demonstrate the importance of accurate regional paleobathymetry for proxy‐model comparisons.
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spelling pubmed-95406562022-10-14 Improved Model‐Data Agreement With Strongly Eddying Ocean Simulations in the Middle‐Late Eocene Nooteboom, Peter D. Baatsen, Michiel Bijl, Peter K. Kliphuis, Michael A. van Sebille, Erik Sluijs, Appy Dijkstra, Henk A. von der Heydt, Anna S. Paleoceanogr Paleoclimatol Research Article Model simulations of past climates are increasingly found to compare well with proxy data at a global scale, but regional discrepancies remain. A persistent issue in modeling past greenhouse climates has been the temperature difference between equatorial and (sub‐)polar regions, which is typically much larger in simulations than proxy data suggest. Particularly in the Eocene, multiple temperature proxies suggest extreme warmth in the southwest Pacific Ocean, where model simulations consistently suggest temperate conditions. Here, we present new global ocean model simulations at 0.1° horizontal resolution for the middle‐late Eocene. The eddies in the high‐resolution model affect poleward heat transport and local time‐mean flow in critical regions compared to the noneddying flow in the standard low‐resolution simulations. As a result, the high‐resolution simulations produce higher surface temperatures near Antarctica and lower surface temperatures near the equator compared to the low‐resolution simulations, leading to better correspondence with proxy reconstructions. Crucially, the high‐resolution simulations are also much more consistent with biogeographic patterns in endemic‐Antarctic and low‐latitude‐derived plankton, and thus resolve the long‐standing discrepancy of warm subpolar ocean temperatures and isolating polar gyre circulation. The results imply that strongly eddying model simulations are required to reconcile discrepancies between regional proxy data and models, and demonstrate the importance of accurate regional paleobathymetry for proxy‐model comparisons. John Wiley and Sons Inc. 2022-08-17 2022-08 /pmc/articles/PMC9540656/ /pubmed/36248180 http://dx.doi.org/10.1029/2021PA004405 Text en © 2022. The Authors. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Nooteboom, Peter D.
Baatsen, Michiel
Bijl, Peter K.
Kliphuis, Michael A.
van Sebille, Erik
Sluijs, Appy
Dijkstra, Henk A.
von der Heydt, Anna S.
Improved Model‐Data Agreement With Strongly Eddying Ocean Simulations in the Middle‐Late Eocene
title Improved Model‐Data Agreement With Strongly Eddying Ocean Simulations in the Middle‐Late Eocene
title_full Improved Model‐Data Agreement With Strongly Eddying Ocean Simulations in the Middle‐Late Eocene
title_fullStr Improved Model‐Data Agreement With Strongly Eddying Ocean Simulations in the Middle‐Late Eocene
title_full_unstemmed Improved Model‐Data Agreement With Strongly Eddying Ocean Simulations in the Middle‐Late Eocene
title_short Improved Model‐Data Agreement With Strongly Eddying Ocean Simulations in the Middle‐Late Eocene
title_sort improved model‐data agreement with strongly eddying ocean simulations in the middle‐late eocene
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9540656/
https://www.ncbi.nlm.nih.gov/pubmed/36248180
http://dx.doi.org/10.1029/2021PA004405
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