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Variability of Dissolved Inorganic Radiocarbon at a Surface Site in the Northeast Pacific Ocean

Published online by Cambridge University Press:  18 July 2016

Ellen R M Druffel ,
Steven Beaupré ,
Sheila Griffin  and
Jeomshik Hwang
Ellen R M Druffel*
Affiliation:
Department of Earth System Science, University of California, Irvine, California 92697-3100, USA
Steven Beaupré
Affiliation:
Department of Earth System Science, University of California, Irvine, California 92697-3100, USA
Sheila Griffin
Affiliation:
Department of Earth System Science, University of California, Irvine, California 92697-3100, USA
Jeomshik Hwang
Affiliation:
School of Environmental Science and Engineering, POSTECH, Pohang 790-784, Korea
*
Corresponding author. Email: [email protected].
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Abstract

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We report radiocarbon measurements of dissolved inorganic carbon (DIC) in surface water samples collected daily during 12 cruises to Station M in the northeast Pacific off central California. Individual surface Δ14C values ranged from 22‰ to 70‰ over 10 yr. Variability of average cruise values is highest during winter likely due to increased mixing. A general decrease of Δ14C values was observed at a rate of about 3‰ per year between 1994 and 2004, about half of that in atmospheric CO2 during this period (Levin and Kromer 2004). The Δ14C results ranged from 2–18‰ during individual cruises and were often significantly larger than the total uncertainty for individual measurements (±3.9‰). This indicates that a single Δ14C result from a surface site is not sufficient to capture the true variability of Δ14C in the surface ocean.

Type
Marine
Information
Radiocarbon , Volume 52 , Issue 3: 20th Int. Radiocarbon Conference Proceedings , 2010 , pp. 1150 - 1157
Copyright
Copyright © 2010 by the Arizona Board of Regents on behalf of the University of Arizona 

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