Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic
Antarctic Intermediate Water (AAIW) plays important roles in the global climate system and the global ocean nutrient and carbon cycles. However, it is unclear how AAIW responds to global climate changes. In particular, neodymium isotopic composition (epsilon(Nd)) reconstructions from different locat...
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fttriple:oai:gotriple.eu:10670/1.dagg99 2023-05-15T13:44:51+02:00 Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic Gu, Sifan Liu, Zhengyu Zhang, Jiaxu Rempfer, Johannes Joos, Fortunat Oppo, Delia W. https://doi.org/10.1002/2017PA003092 https://archimer.ifremer.fr/doc/00495/60709/65334.pdf https://archimer.ifremer.fr/doc/00495/60709/65335.pdf https://archimer.ifremer.fr/doc/00495/60709/ en eng Amer Geophysical Union doi:10.1002/2017PA003092 10670/1.dagg99 https://archimer.ifremer.fr/doc/00495/60709/65334.pdf https://archimer.ifremer.fr/doc/00495/60709/65335.pdf https://archimer.ifremer.fr/doc/00495/60709/ other Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2017-10 , Vol. 32 , N. 10 , P. 1036-1053 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1002/2017PA003092 2023-01-22T17:05:30Z Antarctic Intermediate Water (AAIW) plays important roles in the global climate system and the global ocean nutrient and carbon cycles. However, it is unclear how AAIW responds to global climate changes. In particular, neodymium isotopic composition (epsilon(Nd)) reconstructions from different locations from the tropical Atlantic have led to a debate on the relationship between northward penetration of AAIW into the tropical Atlantic and the Atlantic meridional overturning circulation (AMOC) variability during the last deglaciation. We resolve this controversy by studying the transient oceanic evolution during the last deglaciation using a neodymium-enabled ocean model. Our results suggest a coherent response of AAIW and AMOC: when AMOC weakens, the northward penetration and transport of AAIW decrease while its depth and thickness increase. Our study highlights that as part of the return flow of the North Atlantic Deep Water, the northward penetration of AAIW in the Atlantic is determined predominately by AMOC intensity. Moreover, the inconsistency among different tropical Atlantic epsilon(Nd) reconstructions is reconciled by considering their corresponding core locations and depths, which were influenced by different water masses in the past. The very radiogenic water from the bottom of the Gulf of Mexico and the Caribbean Sea, which was previously overlooked in the interpretations of deglacial epsilon(Nd) variability, can be transported to shallow layers during active AMOC and modulates epsilon(Nd) in the tropical Atlantic. Changes in the AAIW core depth must also be considered. Thus, interpretation of epsilon(Nd) reconstructions from the tropical Atlantic is more complicated than suggested in previous studies. Text Antarc* Antarctic North Atlantic Deep Water North Atlantic Unknown Antarctic Paleoceanography 32 10 1036 1053 |
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geo envir Gu, Sifan Liu, Zhengyu Zhang, Jiaxu Rempfer, Johannes Joos, Fortunat Oppo, Delia W. Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic |
topic_facet |
geo envir |
description |
Antarctic Intermediate Water (AAIW) plays important roles in the global climate system and the global ocean nutrient and carbon cycles. However, it is unclear how AAIW responds to global climate changes. In particular, neodymium isotopic composition (epsilon(Nd)) reconstructions from different locations from the tropical Atlantic have led to a debate on the relationship between northward penetration of AAIW into the tropical Atlantic and the Atlantic meridional overturning circulation (AMOC) variability during the last deglaciation. We resolve this controversy by studying the transient oceanic evolution during the last deglaciation using a neodymium-enabled ocean model. Our results suggest a coherent response of AAIW and AMOC: when AMOC weakens, the northward penetration and transport of AAIW decrease while its depth and thickness increase. Our study highlights that as part of the return flow of the North Atlantic Deep Water, the northward penetration of AAIW in the Atlantic is determined predominately by AMOC intensity. Moreover, the inconsistency among different tropical Atlantic epsilon(Nd) reconstructions is reconciled by considering their corresponding core locations and depths, which were influenced by different water masses in the past. The very radiogenic water from the bottom of the Gulf of Mexico and the Caribbean Sea, which was previously overlooked in the interpretations of deglacial epsilon(Nd) variability, can be transported to shallow layers during active AMOC and modulates epsilon(Nd) in the tropical Atlantic. Changes in the AAIW core depth must also be considered. Thus, interpretation of epsilon(Nd) reconstructions from the tropical Atlantic is more complicated than suggested in previous studies. |
format |
Text |
author |
Gu, Sifan Liu, Zhengyu Zhang, Jiaxu Rempfer, Johannes Joos, Fortunat Oppo, Delia W. |
author_facet |
Gu, Sifan Liu, Zhengyu Zhang, Jiaxu Rempfer, Johannes Joos, Fortunat Oppo, Delia W. |
author_sort |
Gu, Sifan |
title |
Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic |
title_short |
Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic |
title_full |
Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic |
title_fullStr |
Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic |
title_full_unstemmed |
Coherent Response of Antarctic Intermediate Water and Atlantic Meridional Overturning Circulation During the Last Deglaciation: Reconciling Contrasting Neodymium Isotope Reconstructions From the Tropical Atlantic |
title_sort |
coherent response of antarctic intermediate water and atlantic meridional overturning circulation during the last deglaciation: reconciling contrasting neodymium isotope reconstructions from the tropical atlantic |
publisher |
Amer Geophysical Union |
url |
https://doi.org/10.1002/2017PA003092 https://archimer.ifremer.fr/doc/00495/60709/65334.pdf https://archimer.ifremer.fr/doc/00495/60709/65335.pdf https://archimer.ifremer.fr/doc/00495/60709/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic Deep Water North Atlantic |
op_source |
Archimer, archive institutionnelle de l'Ifremer Paleoceanography (0883-8305) (Amer Geophysical Union), 2017-10 , Vol. 32 , N. 10 , P. 1036-1053 |
op_relation |
doi:10.1002/2017PA003092 10670/1.dagg99 https://archimer.ifremer.fr/doc/00495/60709/65334.pdf https://archimer.ifremer.fr/doc/00495/60709/65335.pdf https://archimer.ifremer.fr/doc/00495/60709/ |
op_rights |
other |
op_doi |
https://doi.org/10.1002/2017PA003092 |
container_title |
Paleoceanography |
container_volume |
32 |
container_issue |
10 |
container_start_page |
1036 |
op_container_end_page |
1053 |
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1766207670389309440 |