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Variability of Monthly Radiocarbon During the 1760S in Corals from the Galapagos Islands

  • Ellen R M Druffel, Sheila Griffin (a1), Jeomshik Hwang (a1), Tomoko Komada (a1), Steven R Beaupre (a1), Kevin C Druffel-Rodriguez (a1), Guaciara M Santos (a1) and John Southon (a1)...

Abstract

Radiocarbon (Δ14C) measurements of monthly samples from a Galapagos surface coral are among the first data sets from the new Keck Carbon Cycle Accelerator Mass Spectrometry laboratory at the University of California, Irvine. An average Δ14C value of −62 is obtained for 144 measurements of samples from monthly coral bands that lived from about AD 1760–1771 (±6 yr). High Δ14C values were found during January through March, when upwelling was weak or absent at the Galapagos Islands. Low Δ14C values were obtained mid-year during strong upwelling. The average seasonal variability of Δ14C was 15–25, which is greater than that at other tropical and subtropical locations in the Pacific Ocean because of intense seasonal upwelling at this site. Periods of sustained high Δ14C values were found during 1762–1763 and 1766. A spectral analysis revealed that the spectral density for the Δ14C data displays most of its variance at the 5-yr cycle, which is reflective of El Niño periodicity during the 20th century.

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Copyright

Corresponding author

Corresponding author. Email: edruffel@uci.edu.

References

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Bjerknes, J. 1969. Atmospheric teleconnections from the equatorial Pacific. Monthly Weather Review 97:163–72.
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.
Druffel, EM. 1981. Radiocarbon in annual coral rings from the eastern tropical Pacific Ocean. Geophysical Research Letters 8:5962.
Druffel, ERM. 1987. Bomb radiocarbon in the Pacific: annual and seasonal timescale variations. Journal of Marine Research 45:667–98.
Druffel, ERM, Griffin, S, Guilderson, T, Kashgarian, M, Schrag, D. 2001. Changes of subtropical North Pacific radiocarbon and correlation with climate variability. Radiocarbon 43(1):1525.
Dunbar, R, Wellington, G, Colgan, M, Glynn, P. 1991. Eastern tropical Pacific corals monitor low latitude climate of the past 400 years. In: Betancourt, J, Tharp, V, editors. Seventh Annual Pacific Climate (PACLIM) Workshop. California Department of Water Resources. Interagency Ecological Studies Program. p 183–98.
Grottoli, A, Gille, S, Druffel, ERM, Dunbar, R. 2003. Decadal timescale shift in the radiocarbon record of a central equatorial Pacific coral. Radiocarbon 45(1):91–9.
Guilderson, T, Schrag, D. 1998. Abrupt shift in subsurface temperatures in the tropical Pacific associated with changes in El Niño. Science 281:240–3.
Guilderson, T, Schrag, D, Goddard, E, Kashgarian, M, Wellington, G, Linsley, B. 2000. Southwest subtropical Pacific surface water radiocarbon in a high-resolution coral record. Radiocarbon 42(2):249–56.
Guilderson, T, Schrag, D, Kashgarian, M, Southon, J. 1998. Radiocarbon variability in the Western Equatorial Pacific inferred from a high-resolution coral record from Nauru Island. Journal of Geophysical Research 103(C11):24,64151.
Richards, AF. 1957. Volcanism in eastern Pacific Ocean basin, 1954–1955. International Geological Congress, Mexico, Proceedings X 1:1931.
Stuiver, M, Polach, HA. 1977. Discussion: reporting of 14C data. Radiocarbon 19(3):355–63.
Toggweiler, JR, Dixon, K, Broecker, WS. 1991. The Peru upwelling and the ventilation of the South Pacific thermocline. Journal Geophysical Research 96: 20,46797.
Vogel, JS, Southon, JR, Nelson, DE. 1987. Catalyst and binder effects in the use of filamentous graphite for AMS. Nuclear Instruments and Methods in Physics Research B 29:50–6.
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Radiocarbon
  • ISSN: 0033-8222
  • EISSN: 1945-5755
  • URL: /core/journals/radiocarbon
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