Fates of paleo Antarctic Bottom Water during the early Eocene ― based on a Lagrangian analysis of IPSL‐CM5A2 climate model simulations
International audience Both deepwater formation and the obduction processes converting dense deepwater to lighter surface water are the engine for the global meridional overturning circulation (MOC). Their spatio‐temporal variations effectively modify the ocean circulation and related carbon cycle,...
Published in: | Paleoceanography and Paleoclimatology |
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Online Access: | https://doi.org/10.1029/2019PA003845 https://hal.archives-ouvertes.fr/hal-03079059/file/870257_2_merged_1602519769_small.pdf https://hal.archives-ouvertes.fr/hal-03079059 |
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fttriple:oai:gotriple.eu:10670/1.s5rlvg 2023-05-15T13:54:44+02:00 Fates of paleo Antarctic Bottom Water during the early Eocene ― based on a Lagrangian analysis of IPSL‐CM5A2 climate model simulations Zhang, Yurui Grima, Nicolas Huck, Thierry Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Interdisciplinary Graduate School for the Blue planet ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) 2020-12-14 https://doi.org/10.1029/2019PA003845 https://hal.archives-ouvertes.fr/hal-03079059/file/870257_2_merged_1602519769_small.pdf https://hal.archives-ouvertes.fr/hal-03079059 en eng HAL CCSD American Geophysical Union hal-03079059 doi:10.1029/2019PA003845 10670/1.s5rlvg https://hal.archives-ouvertes.fr/hal-03079059/file/870257_2_merged_1602519769_small.pdf https://hal.archives-ouvertes.fr/hal-03079059 Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 2572-4525 EISSN: 1944-9186 Paleoceanography and Paleoclimatology Paleoceanography and Paleoclimatology, American Geophysical Union, 2020, ⟨10.1029/2019PA003845⟩ geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2020 fttriple https://doi.org/10.1029/2019PA003845 2023-01-22T17:00:04Z International audience Both deepwater formation and the obduction processes converting dense deepwater to lighter surface water are the engine for the global meridional overturning circulation (MOC). Their spatio‐temporal variations effectively modify the ocean circulation and related carbon cycle, which affects climate evolution throughout geological time. Using early‐Eocene bathymetry and enhanced atmospheric CO2 concentration, the IPSL‐CM5A2 climate model has simulated a well‐ventilated Southern Ocean associated with a strong anticlockwise MOC.To trace the fates of these paleo Antarctic Bottom Water (paleo‐AABW), we conducted Lagrangian analyses using these IPSL‐CM5A2 model results and tracking virtual particles released at the lower limb of the MOC, defined as an initial section at 60°S below 1900m depth. Diagnostic analysis of these particles trajectories reveals that most paleo‐AABW circulates back to the Southern Ocean through either the initial section (43%) or the section above (31%); the remaining (>25%) crossing the base of the mixed layer mostly in tropical regions (up to half). The majority of water parcels ending in the mixed layer experience negative density transformations, intensified in the upper 500m and mostly occurring in tropical upwelling regions, with a spatial pattern consistent with the wind‐driven Ekman pumping, largely determined by the Eocene wind stress and continental geometry.In the same way as present‐day North Atlantic Deep Water upwells in the Southern Ocean, our results suggest that the strong tropical and equatorial upwelling during the Eocene provides an efficient pathway from the abyss to the surface, but at much higher temperature, with potential implications for the oceanic carbon cycle. Article in Journal/Newspaper Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean Unknown Antarctic Southern Ocean Paleoceanography and Paleoclimatology 36 1 |
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English |
topic |
geo envir |
spellingShingle |
geo envir Zhang, Yurui Grima, Nicolas Huck, Thierry Fates of paleo Antarctic Bottom Water during the early Eocene ― based on a Lagrangian analysis of IPSL‐CM5A2 climate model simulations |
topic_facet |
geo envir |
description |
International audience Both deepwater formation and the obduction processes converting dense deepwater to lighter surface water are the engine for the global meridional overturning circulation (MOC). Their spatio‐temporal variations effectively modify the ocean circulation and related carbon cycle, which affects climate evolution throughout geological time. Using early‐Eocene bathymetry and enhanced atmospheric CO2 concentration, the IPSL‐CM5A2 climate model has simulated a well‐ventilated Southern Ocean associated with a strong anticlockwise MOC.To trace the fates of these paleo Antarctic Bottom Water (paleo‐AABW), we conducted Lagrangian analyses using these IPSL‐CM5A2 model results and tracking virtual particles released at the lower limb of the MOC, defined as an initial section at 60°S below 1900m depth. Diagnostic analysis of these particles trajectories reveals that most paleo‐AABW circulates back to the Southern Ocean through either the initial section (43%) or the section above (31%); the remaining (>25%) crossing the base of the mixed layer mostly in tropical regions (up to half). The majority of water parcels ending in the mixed layer experience negative density transformations, intensified in the upper 500m and mostly occurring in tropical upwelling regions, with a spatial pattern consistent with the wind‐driven Ekman pumping, largely determined by the Eocene wind stress and continental geometry.In the same way as present‐day North Atlantic Deep Water upwells in the Southern Ocean, our results suggest that the strong tropical and equatorial upwelling during the Eocene provides an efficient pathway from the abyss to the surface, but at much higher temperature, with potential implications for the oceanic carbon cycle. |
author2 |
Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Interdisciplinary Graduate School for the Blue planet ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) |
format |
Article in Journal/Newspaper |
author |
Zhang, Yurui Grima, Nicolas Huck, Thierry |
author_facet |
Zhang, Yurui Grima, Nicolas Huck, Thierry |
author_sort |
Zhang, Yurui |
title |
Fates of paleo Antarctic Bottom Water during the early Eocene ― based on a Lagrangian analysis of IPSL‐CM5A2 climate model simulations |
title_short |
Fates of paleo Antarctic Bottom Water during the early Eocene ― based on a Lagrangian analysis of IPSL‐CM5A2 climate model simulations |
title_full |
Fates of paleo Antarctic Bottom Water during the early Eocene ― based on a Lagrangian analysis of IPSL‐CM5A2 climate model simulations |
title_fullStr |
Fates of paleo Antarctic Bottom Water during the early Eocene ― based on a Lagrangian analysis of IPSL‐CM5A2 climate model simulations |
title_full_unstemmed |
Fates of paleo Antarctic Bottom Water during the early Eocene ― based on a Lagrangian analysis of IPSL‐CM5A2 climate model simulations |
title_sort |
fates of paleo antarctic bottom water during the early eocene ― based on a lagrangian analysis of ipsl‐cm5a2 climate model simulations |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://doi.org/10.1029/2019PA003845 https://hal.archives-ouvertes.fr/hal-03079059/file/870257_2_merged_1602519769_small.pdf https://hal.archives-ouvertes.fr/hal-03079059 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic Southern Ocean |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 2572-4525 EISSN: 1944-9186 Paleoceanography and Paleoclimatology Paleoceanography and Paleoclimatology, American Geophysical Union, 2020, ⟨10.1029/2019PA003845⟩ |
op_relation |
hal-03079059 doi:10.1029/2019PA003845 10670/1.s5rlvg https://hal.archives-ouvertes.fr/hal-03079059/file/870257_2_merged_1602519769_small.pdf https://hal.archives-ouvertes.fr/hal-03079059 |
op_doi |
https://doi.org/10.1029/2019PA003845 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
36 |
container_issue |
1 |
_version_ |
1766260824175804416 |