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| CORALS AND SCLEROSPONGES | ||||||||||
Fanning Island - Coral Radiocarbon Data |
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Grottoli, A.G., S.T. Gille, E.R.M. Druffel, and R.B. Dunbar. 2003. Decadal timescale shift in the 14C record of a central equatorial Pacific coral. Radiocarbon 45(1):91-99.
Start Year: 1922 AD End Year: 1956 AD Data: Please Cite Data Contributors! east_pacific/fanning_2003.txt |
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Summary:Coral skeletal radiocarbon records reflect seawater d14C and are useful for reconstructing the history of water mass movement and ventilation in the tropical oceans. Here, we reconstructed the inter-annual variability in central equatorial Pacific surface water d14C from 1922-1956 using near-monthly radiocarbon measurements in a Porites sp. coral skeleton (FI5A) from the windward side of Fanning Island (3 deg 54'32"N, 159 deg 18'88"W). The most pronounced feature in this record is a large positive shift in d14C between 1947 and 1956 that coincides with the switch of the Pacific Decadal Oscillation (PDO) from a positive to a negative phase in the mid-1940s. Although the absolute d14C values from 1950 - 1955 in FI5A differ from the d14C values of another coral core collected from the opposite side of the island, both records show a large positive shift in their d14C records at that time. The relative increase in d14C of each record is consistent with the premise that a common mechanism is controlling the d14C records within each coral record. Overall, the Fanning d14C data support the notion that a significant amount of subtropical seawater is arriving at the equator but does not allow us to determine the mechanism for its transport.More Info on Corals and Sclerosponges |
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Parameters:del14C |
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Complete XML Record:noaa-coral-1879 (Last Revised: 2007-09-05 ) |
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