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

Gu, Sifan; Liu, Zhengyu; Jahn, Alexandra; Rempfer, Johannes; Zhang, Jiaxu; Joos, Fortunat

doi:10.1029/2018MS001538

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

Journal Article · Mon Mar 04 00:00:00 EST 2019 · Journal of Advances in Modeling Earth Systems

DOI:https://doi.org/10.1029/2018MS001538· OSTI ID:1497749

^[1]; Liu, Zhengyu ^[2];

^[3]; Rempfer, Johannes ^[4];

^[5];

^[4]

Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, Madison WI USA, Now at Physical Oceanography Laboratory, Ocean University of China, Qingdao China
Atmospheric Science Program, Department of Geography, The Ohio State University, Columbus OH USA
Department for Atmospheric and Oceanic Sciences and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder CO USA
Climate and Environmental Physics, Physics Institute and Oeschger Center for Climate Change Research, University of Bern, Bern Switzerland
Computational Physics and Methods (CCS-2) and Center for Nonlinear Studies (CNLS), Los Alamos National Laboratory, Los Alamos NM USA

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 δ¹⁸O, ²³¹Pa/²³⁰Th, δ¹³C, and radiocarbon in the same model, can improve our understanding of past ocean circulation significantly.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: SC0006744; 89233218CNA000001

OSTI ID:: 1497749

Alternate ID(s):: OSTI ID: 1497750; OSTI ID: 1499368

Report Number(s):: LA-UR-19-21453

Journal Information:: Journal of Advances in Modeling Earth Systems, Journal Name: Journal of Advances in Modeling Earth Systems; ISSN 1942-2466

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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