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

Abstract

Neodymium (Nd) isotopic composition (ε Nd) 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 ε Nd and Nd concentrations. Our model provides a useful tool for the interpretation of ε Nd reconstructions. For example, we show that in an idealized North Atlantic freshwater hosing experiment, ε Nd 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 ε Nd in the Atlantic, depending on the location. The implementation of Nd, together with other existing tracers, such as δ 18O, 231Pa/ 230Th, δ 13C, and radiocarbon in the same model, can improve our understanding of past ocean circulation significantly.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [4]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. The Ohio State Univ., Columbus, OH (United States)
  3. Univ. of Colorado, Boulder, CO (United States)
  4. University of Bern (Switzerland)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1497749
Alternate Identifier(s):
OSTI ID: 1497750; OSTI ID: 1499368
Report Number(s):
LA-UR-19-21453
Journal ID: ISSN 1942-2466
Grant/Contract Number:  
89233218CNA000001; SC0006744
Resource Type:
Published Article
Journal Name:
Journal of Advances in Modeling Earth Systems
Additional Journal Information:
Journal Name: Journal of Advances in Modeling Earth Systems; Journal ID: ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Nd isotopes; isotope modelling; CESM

Citation Formats

Gu, Sifan, Liu, Zhengyu, Jahn, Alexandra, Rempfer, Johannes, Zhang, Jiaxu, and Joos, Fortunat. Modeling Neodymium Isotopes in the Ocean Component of the Community Earth System Model (CESM1). United States: N. p., 2019. Web. doi:10.1029/2018MS001538.
Gu, Sifan, Liu, Zhengyu, Jahn, Alexandra, Rempfer, Johannes, Zhang, Jiaxu, & Joos, Fortunat. Modeling Neodymium Isotopes in the Ocean Component of the Community Earth System Model (CESM1). United States. doi:10.1029/2018MS001538.
Gu, Sifan, Liu, Zhengyu, Jahn, Alexandra, Rempfer, Johannes, Zhang, Jiaxu, and Joos, Fortunat. Mon . "Modeling Neodymium Isotopes in the Ocean Component of the Community Earth System Model (CESM1)". United States. doi:10.1029/2018MS001538.
@article{osti_1497749,
title = {Modeling Neodymium Isotopes in the Ocean Component of the Community Earth System Model (CESM1)},
author = {Gu, Sifan and Liu, Zhengyu and Jahn, Alexandra and Rempfer, Johannes and Zhang, Jiaxu and Joos, Fortunat},
abstractNote = {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},
journal = {Journal of Advances in Modeling Earth Systems},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {3}
}

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DOI: 10.1029/2018MS001538

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