Modeling the Miocene Climatic Optimum: Ocean Circulation
Ocean circulation is investigated using the Community Climate System Model 3 (CCSM3) forced with early to middle Miocene (∼20–14 Ma) topography, bathymetry, vegetation and modern CO2. Significant bottom water formation is modeled in the Weddell Sea along with intermediate North Component Water forma...
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ftpurdueuniv:oai:docs.lib.purdue.edu:easpubs-1179 2023-07-02T03:30:55+02:00 Modeling the Miocene Climatic Optimum: Ocean Circulation Herold, Nicholas Huber, Matthew Müller, R. D. Seton, M. 2012-02-21T08:00:00Z application/pdf https://docs.lib.purdue.edu/easpubs/180 https://docs.lib.purdue.edu/context/easpubs/article/1179/viewcontent/Herold_et_al_2012_Paleoceanography_ModelingMioceneClimatic.pdf unknown Purdue University https://docs.lib.purdue.edu/easpubs/180 https://docs.lib.purdue.edu/context/easpubs/article/1179/viewcontent/Herold_et_al_2012_Paleoceanography_ModelingMioceneClimatic.pdf Department of Earth, Atmospheric, and Planetary Sciences Faculty Publications CCSM Miocene ocean circulation text 2012 ftpurdueuniv 2023-06-12T21:03:50Z Ocean circulation is investigated using the Community Climate System Model 3 (CCSM3) forced with early to middle Miocene (∼20–14 Ma) topography, bathymetry, vegetation and modern CO2. Significant bottom water formation is modeled in the Weddell Sea along with intermediate North Component Water formation in the North Atlantic. This is attributed primarily to stronger- and weaker-than-modern convective preconditioning in the Weddell and Labrador Seas, respectively. Global meridional overturning and gyre circulation is weaker in the Miocene due to weaker midlatitude westerlies in the southern hemisphere, caused by lowering of the meridional surface temperature gradient, in addition to regional influences on convection. Subsurface temperatures in the Miocene are significantly higher in the far North Atlantic, Greenland-Norwegian Seas and Arctic basin compared to the present. Ocean heat transport is symmetrical about the equator and resembles that simulated for late Cretaceous and early Cenozoic climates, suggesting the northern hemisphere dominated ocean heat transport active today developed after the middle Miocene. Simulated deep water warming in the Miocene is more than an order of magnitude lower than indicated by proxies. This discrepancy is not reconciled by higher CO2 due to the persistence of sea-ice at sites of deep water formation. This suggests that either the CCSM3 is insufficiently sensitive to Miocene boundary conditions, greater greenhouse forcing existed than is currently reconstructed, or that proxy records of warming are exaggerated. Given the diversity of global Miocene proxy records and their near-unanimous estimate of a significantly warmer Earth, the first two options are more likely. Text Arctic Basin Arctic Greenland North Atlantic Sea ice Weddell Sea Purdue University: e-Pubs Arctic Greenland Weddell Weddell Sea |
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CCSM Miocene ocean circulation |
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CCSM Miocene ocean circulation Herold, Nicholas Huber, Matthew Müller, R. D. Seton, M. Modeling the Miocene Climatic Optimum: Ocean Circulation |
topic_facet |
CCSM Miocene ocean circulation |
description |
Ocean circulation is investigated using the Community Climate System Model 3 (CCSM3) forced with early to middle Miocene (∼20–14 Ma) topography, bathymetry, vegetation and modern CO2. Significant bottom water formation is modeled in the Weddell Sea along with intermediate North Component Water formation in the North Atlantic. This is attributed primarily to stronger- and weaker-than-modern convective preconditioning in the Weddell and Labrador Seas, respectively. Global meridional overturning and gyre circulation is weaker in the Miocene due to weaker midlatitude westerlies in the southern hemisphere, caused by lowering of the meridional surface temperature gradient, in addition to regional influences on convection. Subsurface temperatures in the Miocene are significantly higher in the far North Atlantic, Greenland-Norwegian Seas and Arctic basin compared to the present. Ocean heat transport is symmetrical about the equator and resembles that simulated for late Cretaceous and early Cenozoic climates, suggesting the northern hemisphere dominated ocean heat transport active today developed after the middle Miocene. Simulated deep water warming in the Miocene is more than an order of magnitude lower than indicated by proxies. This discrepancy is not reconciled by higher CO2 due to the persistence of sea-ice at sites of deep water formation. This suggests that either the CCSM3 is insufficiently sensitive to Miocene boundary conditions, greater greenhouse forcing existed than is currently reconstructed, or that proxy records of warming are exaggerated. Given the diversity of global Miocene proxy records and their near-unanimous estimate of a significantly warmer Earth, the first two options are more likely. |
format |
Text |
author |
Herold, Nicholas Huber, Matthew Müller, R. D. Seton, M. |
author_facet |
Herold, Nicholas Huber, Matthew Müller, R. D. Seton, M. |
author_sort |
Herold, Nicholas |
title |
Modeling the Miocene Climatic Optimum: Ocean Circulation |
title_short |
Modeling the Miocene Climatic Optimum: Ocean Circulation |
title_full |
Modeling the Miocene Climatic Optimum: Ocean Circulation |
title_fullStr |
Modeling the Miocene Climatic Optimum: Ocean Circulation |
title_full_unstemmed |
Modeling the Miocene Climatic Optimum: Ocean Circulation |
title_sort |
modeling the miocene climatic optimum: ocean circulation |
publisher |
Purdue University |
publishDate |
2012 |
url |
https://docs.lib.purdue.edu/easpubs/180 https://docs.lib.purdue.edu/context/easpubs/article/1179/viewcontent/Herold_et_al_2012_Paleoceanography_ModelingMioceneClimatic.pdf |
geographic |
Arctic Greenland Weddell Weddell Sea |
geographic_facet |
Arctic Greenland Weddell Weddell Sea |
genre |
Arctic Basin Arctic Greenland North Atlantic Sea ice Weddell Sea |
genre_facet |
Arctic Basin Arctic Greenland North Atlantic Sea ice Weddell Sea |
op_source |
Department of Earth, Atmospheric, and Planetary Sciences Faculty Publications |
op_relation |
https://docs.lib.purdue.edu/easpubs/180 https://docs.lib.purdue.edu/context/easpubs/article/1179/viewcontent/Herold_et_al_2012_Paleoceanography_ModelingMioceneClimatic.pdf |
_version_ |
1770275188005404672 |