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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: edruffel@uci.edu.
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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 

References

Beaupré, S, Druffel, E. 2009. Constraining the propagation of bomb-radiocarbon through the dissolved organic carbon (DOC) pool in the northeast Pacific Ocean. Deep-Sea Research I 56(10):1717–26.Google Scholar
Bradshaw, AL, Brewer, PG, Shafer, DK, Williams, RT. 1981. Measurements of total carbon dioxide and alkalinity by potentiometric titration in the GEOSECS program. Earth and Planetary Science Letters 55(1):99–115.Google Scholar
Brewer, P, Bradshaw, A, Williams, R. 1986. Measurements of total carbon dioxide and alkalinity in the North Atlantic Ocean in 1981. In: Trabalka, JR, Reichle, D, editors. The Changing Carbon Cycle: A Global Analysis. New York: Springer-Verlag. p 358–81.Google Scholar
Brown, T, Farwell, G, Grootes, P, Schimidt, F, Stuiver, M. 1993. Intra-annual variability of the radiocarbon content of corals from the Galapagos Islands. Radiocarbon 35(2):245–51.Google Scholar
DOE. 1994. Handbook of Method for the Analysis of the Various Parameters of the Carbon Dioxide System in Seawater. Version 2. Dickson, AG, Goyet, C, editors. ORNL/CDIAC-74.Google Scholar
Druffel, E, Griffin, S. 2008. Daily variability of dissolved inorganic radiocarbon at three sites in the surface ocean. Marine Chemistry 110(3–4):185–9.CrossRefGoogle Scholar
Guilderson, T, Schrag, DP, Goddard, E, Kashgarian, M, Wellington, GM, Linsley, BK. 2000. Southwest subtropical Pacific surface water radiocarbon in a high-resolution coral record. Radiocarbon 42(2):249–56.Google Scholar
Key, RM, Quay, PD, Jones, GA, McNichol, AP, von Reden, KF, Schneider, RJ. 1996. WOCE AMS radiocarbon I: Pacific Ocean results (P6, P16 and P17). Radiocarbon 38(3):425–518.CrossRefGoogle Scholar
Levin, I, Kromer, B. 2004. The tropospheric 14CO2 level in mid-latitudes of the Northern Hemisphere (1959–2003). Radiocarbon 46(3):1261–72.Google Scholar
Masiello, C, Druffel, E, Bauer, J. 1998. Physical influences on dissolved inorganic radiocarbon variability in the California Current. Deep-Sea Research II 45(4–5):617–42.Google Scholar
McDuffee, K, Druffel, E. 2007. Daily variability of dissolved inorganic radiocarbon in Sargasso Sea surface waters. Marine Chemistry 106(3–4):510–5.Google Scholar
McNichol, AP, Jones, G, Hutton, D, Gagnon, A. 1994. The rapid preparation of seawater σCO2 for radiocarbon analysis at the National Ocean Sciences AMS Facility. Radiocarbon 36(2):237–46.Google Scholar
Morimoto, M, Kitagawa, H, Shibata, Y, Kayane, H. 2004. Seasonal radiocarbon variation of surface seawater recorded in a coral from Kikai Island, subtropical northwestern Pacific. Radiocarbon 46(2):643–8.Google Scholar
Southon, J, Santos, G, Druffel-Rodriguez, K, Druffel, E, Trumbore, S, Xu, X, Griffin, S, Ali, S, Mazon, M. 2004. The Keck Carbon Cycle AMS Laboratory, University of California, Irvine: initial operation and a background surprise. Radiocarbon 46(1):41–50.Google Scholar
Stuiver, M, Polach, HA. 1977. Discussion: reporting of 14C data. Radiocarbon 19(3):355–63.Google Scholar
Wolter, K. 2007. Multivariate ENSO Index (MEI) [WWW document]. URL: http://www.esrl.noaa.gov/psd/people/klaus.wolter/MEI/.Google Scholar