On the relationship between Nd isotopic composition and ocean overturning circulation in idealized freshwater discharge events

• Published in: Paleoceanography
• Main Authors: Rempfer, Johannes, Stocker, Thomas, Joos, Fortunat, Dutay, Jean-Claude
• Other Authors: Oeschger Centre for Climate Change Research (OCCR), University of Bern, Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Modélisation du climat (CLIM), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2012
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; Antarctic; Pacific; Southern Ocean; Antarc*; NADW; North Atlantic Deep Water; North Atlantic
• Online Access: https://hal.archives-ouvertes.fr/hal-03096624; https://hal.archives-ouvertes.fr/hal-03096624/document; https://hal.archives-ouvertes.fr/hal-03096624/file/2012PA002312.pdf; https://doi.org/10.1029/2012PA002312

International audience Using a cost-efficient climate model, the effect of changes in overturning circulation on neodymium isotopic composition, Nd , is systematically examined for the first time. Idealized sequences of abrupt climate changes are induced by the application of periodic freshwater fluxes to the North Atlantic (NA) and the Southern Ocean (SO), thus mainly affecting either the formation of North Atlantic Deep Water (NADW) or Antarctic Bottom Water (AABW). Variations in Nd reflect weakening and strengthening of the formation of NADW and AABW, changes in Nd of end-members are relatively small. Relationships between Nd and the strength of NADW or AABW are more pronounced for AABW than for NADW. Atlantic patterns of variations in Nd systematically differ between NA and SO experiments. Additionally, the signature of changes in Nd in the Atlantic and the Pacific is alike in NA but opposite in SO experiments. Discrimination between NA and SO experiments is therefore possible based on the Atlantic pattern of variations in Nd and the contrariwise behavior of Nd in the Atlantic and the Pacific. In further experiments we examined the effect of variations in magnitudes of particle export fluxes. Within the examined range, and although settling particles represent the only sink of Nd, their effects on Nd are relatively small. Our results confirm the large potential of Nd as a paleocirculation tracer but also indicate its limitations of quantitative reconstructions of changes in the Atlantic Meridional Ocean Circulation.