Neodymium isotope evidence for glacial-interglacial variability of deepwater transit time in the Pacific Ocean

Hu, Rong and Piotrowski, Alexander M. (2018) Neodymium isotope evidence for glacial-interglacial variability of deepwater transit time in the Pacific Ocean. Nature Communications, 9 (1). ISSN 2041-1723 DOI https://doi.org/10.1038/s41467-018-07079-z

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Official URL: https://doi.org/10.1038/s41467-018-07079-z

Abstract

There is evidence for greater carbon storage in the glacial deep Pacific, but it is uncertain whether it was caused by changes in ventilation, circulation, and biological productivity. The spatial εNd evolution in the deep Pacific provides information on the deepwater transit time. Seven new foraminiferal εNd records are presented to systematically constrain glacial to interglacial changes in deep Pacific overturning and two different εNd evolution regimes occur spatially in the Pacific with reduced meridional εNd gradients in glacials, suggesting a faster deep Pacific overturning circulation. This implies that greater glacial carbon storage due to sluggish circulation, that is believed to have occurred in the deep Atlantic, did not operate in a similar manner in the Pacific Ocean. Other mechanisms such as increased biological pump efficiency and poor high latitude air-sea exchange could be responsible for increased carbon storage in the glacial Pacific.

Item Type: Article
Uncontrolled Keywords: 2018AREP; IA74
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
12 - PhD
Journal or Publication Title: Nature Communications
Volume: 9
Identification Number: https://doi.org/10.1038/s41467-018-07079-z
Depositing User: Sarah Humbert
Date Deposited: 05 Dec 2018 11:47
Last Modified: 05 Dec 2018 11:47
URI: http://eprints.esc.cam.ac.uk/id/eprint/4368

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