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Oceanic Radiocarbon and Tritium On A Transect Between Australia and Bali (Eastern Indian Ocean)

Published online by Cambridge University Press:  18 July 2016

Viviane Leboucher
Affiliation:
Laboratoire des Sciences du Climat et de l'Environnement, IPSL, CEA-CNRS, CEA/Saclay, F91191-Gif/Yvette cedex, France
Philippe Jean-Baptiste*
Affiliation:
Laboratoire des Sciences du Climat et de l'Environnement, IPSL, CEA-CNRS, CEA/Saclay, F91191-Gif/Yvette cedex, France
Elise Fourré
Affiliation:
Laboratoire des Sciences du Climat et de l'Environnement, IPSL, CEA-CNRS, CEA/Saclay, F91191-Gif/Yvette cedex, France
Maurice Arnold
Affiliation:
Laboratoire des Sciences du Climat et de l'Environnement, IPSL, CEA-CNRS, CEA/Saclay, F91191-Gif/Yvette cedex, France
Michèle Fieux
Affiliation:
Laboratoire d'Océanographie Dynamique et de Climatologie, Université Paris VI, F75252 - Paris cedex 05, France
*
Corresponding author. Email: pjb@lsce.saclay.cea.fr.
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Abstract

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Results are presented of radiocarbon and tritium measurements along a transect between the Australian continental shelf and the Indonesian coast of Bali. The stations lie in the easternmost part of the Indian Ocean, close to the sills over which the Indonesian throughflow (ITF) makes its way to the Indian Ocean. The present data, obtained as part of the Java-Australia Dynamics Experiment (JADE) in August 1989, complement the WOCE 14C and tritium data set on both sides of the Indonesian archipelago and give us the opportunity to discuss the origin of the water masses and timescale of the throughflow. Both tracers point to a north equatorial Pacific origin of the waters. The comparison of the tritium inventories in the Pacific North Equatorial Current and along the JADE transect suggests a minimum transit time of the waters across the Indonesian seaways of the order of 5 to 6 yr, corresponding to a throughflow <18 × 106 m3/s.

Type
Part II
Copyright
Copyright © The Arizona Board of Regents on behalf of the University of Arizona 

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