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    Δ14C and δ13C of Seawater DIC as Tracers of Coastal Upwelling: A 5-Year Time Series from Southern California

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    Author
    Santos, Guaciara M.
    Ferguson, Julie
    Acaylar, Kayla
    Johnson, Kathleen R.
    Griffin, Sheila
    Druffel, Ellen
    Issue Date
    2011-12-16
    
    Metadata
    Show full item record
    Citation
    Santos, G. M., Ferguson, J., Acaylar, K., Johnson, K. R., Griffin, S., & Druffel, E. (2011). Δ14C and δ13C of seawater DIC as tracers of coastal upwelling: A 5-year time series from Southern California. Radiocarbon, 53(4), 669-677.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/654988
    DOI
    10.1017/S0033822200039126
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    Marine radiocarbon (14C) is a widely used tracer of past ocean circulation, but very few high-resolution records have been obtained. Here, we report a time series of carbon isotope abundances of dissolved inorganic carbon (DIC) in surface seawater collected from the Newport Beach pier in Orange County, within the Southern California Bight, from 2005 to 2010. Surface seawater was collected bimonthly and analyzed for 14C, 13C, and salinity. Results from May 2005 to November 2010 show no long-term changes in 13C DIC values and no consistent variability that can be attributed to upwelling. 14C DIC values have lowered from ~34 to about ~16, an 18 decrease from the beginning of this project in 2005, and is consistent with the overall 14C depletion from the atmospheric thermonuclear bomb pulse at the end of the 1950s. 14C DIC values, paired with salinity, do appear to be suitable indicators of upwelling strength with periods of upwelling characterized by more saline and lower DIC 14C values. However, a similar signal was not observed during the strong upwelling event of 2010. These results were obtained in the Southern California Bight where upwelling is fairly weak and there is a complex oceanographic circulation in comparison with the remaining western USA coastline. It is therefore likely that the link between DIC 14C, salinity, and upwelling would be even stronger at other sites. These data represent the longest time series of 14C data from a coastal Southern California site performed to date.
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200039126
    Scopus Count
    Collections
    Radiocarbon, Volume 53, Number 4 (2011)

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