Modeling Neodymium Isotopes in the Ocean Component of the Community Earth System Model (CESM1)

TitleModeling Neodymium Isotopes in the Ocean Component of the Community Earth System Model (CESM1)
Publication TypeJournal Article
Year of Publication2019
AuthorsGu, Sifan, Liu Zhengyu, Jahn Alexandra, Rempfer Johannes, Zhang jiaxu, and Joos Fortunat
JournalJournal of Advances in Modeling Earth Systems
Volume11
Number3
Pages624 - 640
Date Published02/2019
Abstract / Summary

Neodymium (Nd) isotopic composition (εNd) is an important tracer for water mass mixing and the reconstruction of past ocean circulation. To allow for a direct model‐data comparison, we have implemented Nd isotopes in the ocean component of the Community Earth System Model (CESM1.3). The model is able to capture the major features of the observed modern distribution of both εNd and Nd concentrations. Our model provides a useful tool for the interpretation of εNd reconstructions. For example, we show that in an idealized North Atlantic freshwater hosing experiment, εNd changes in the Atlantic are documenting primarily the changes in water mass mixing and are hardly affected by the concomitant and large changes in the marine biological productivity and organic matter fluxes. However, the hosing experiment also shows that the end‐member changes due to the change of ocean circulation can influence the interpretation of εNd in the Atlantic, depending on the location. The implementation of Nd, together with other existing tracers, such as δ18O, 231Pa/230Th, δ13C, and radiocarbon in the same model, can improve our understanding of past ocean circulation significantly

URLhttps://onlinelibrary.wiley.com/doi/abs/10.1029/2018MS001538
DOI10.1029/2018MS001538
Journal: Journal of Advances in Modeling Earth Systems
Year of Publication: 2019
Volume: 11
Number: 3
Pages: 624 - 640
Date Published: 02/2019

Neodymium (Nd) isotopic composition (εNd) is an important tracer for water mass mixing and the reconstruction of past ocean circulation. To allow for a direct model‐data comparison, we have implemented Nd isotopes in the ocean component of the Community Earth System Model (CESM1.3). The model is able to capture the major features of the observed modern distribution of both εNd and Nd concentrations. Our model provides a useful tool for the interpretation of εNd reconstructions. For example, we show that in an idealized North Atlantic freshwater hosing experiment, εNd changes in the Atlantic are documenting primarily the changes in water mass mixing and are hardly affected by the concomitant and large changes in the marine biological productivity and organic matter fluxes. However, the hosing experiment also shows that the end‐member changes due to the change of ocean circulation can influence the interpretation of εNd in the Atlantic, depending on the location. The implementation of Nd, together with other existing tracers, such as δ18O, 231Pa/230Th, δ13C, and radiocarbon in the same model, can improve our understanding of past ocean circulation significantly

DOI: 10.1029/2018MS001538
Citation:
Gu, S, Z Liu, A Jahn, J Rempfer, J Zhang, and F Joos.  2019.  "Modeling Neodymium Isotopes in the Ocean Component of the Community Earth System Model (CESM1)."  Journal of Advances in Modeling Earth Systems 11(3): 624 - 640.  https://doi.org/10.1029/2018MS001538.