Dissolved inorganic radiocarbon in the North Pacific Ocean and Sargasso Sea

We present radiocarbon measurements of dissolved inorganic carbon (DIC) in depth profiles from reoccupations of our central North Pacific Ocean and Sargasso Sea (SS) sites. From 1985 to 1999, an increase in Δ14C values of 6–17‰ was measured between 1150 and 2400 m depth in the North Central Pacific....

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Bibliographic Details
Published in:Deep Sea Research Part I: Oceanographic Research Papers
Main Authors: Druffel, Ellen R.M., Bauer, James E, Griffin, Sheila, Beaupré , Steven R, Hwang, Jeomshik
Format: Article in Journal/Newspaper
Language:English
Published: eScholarship, University of California 2008
Subjects:
Physical Sciences and Mathematics
dissolved inorganic carbon
radiocarbon
bomb radiocarbon
deep circulation
Pacific
NADW
North Atlantic Deep Water
North Atlantic
Online Access:http://www.escholarship.org/uc/item/13400376
Description
Summary:We present radiocarbon measurements of dissolved inorganic carbon (DIC) in depth profiles from reoccupations of our central North Pacific Ocean and Sargasso Sea (SS) sites. From 1985 to 1999, an increase in Δ14C values of 6–17‰ was measured between 1150 and 2400 m depth in the North Central Pacific. Natural changes in deep circulation are likely responsible for variability of Δ14C signatures in the deep ocean, though we cannot rule out the presence of bomb 14C at this depth range. Bomb 14C had increased in the deep SS from 1989 to 2000; this is the result of southward transport of North Atlantic Deep Water (NADW) to this site.

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