Fanning Island - Coral Radiocarbon Data Grottoli, A.G.; Gille, S.T.; Druffel, E.R.M.; Dunbar, R.B. Grottoli, A.G. Gille, S.T. Druffel, E.R.M. Dunbar, R.B. earth science/paleoclimate/corals and sclerosponges (age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,null) earth science/paleoclimate/corals and sclerosponges (Delta 14C,Porites sp.,null,per mil NBS oxalic acid,null,corals and sclerosponges,raw,accelerator mass spectrometry,N,null) earth science/paleoclimate/corals and sclerosponges (Fanning Island>LATITUDE 3.9>LONGITUDE -159.2) 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. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Grottoli, A.G. Investigator : Gille, S.T. Investigator : Druffel, E.R.M. Investigator : Dunbar, R.B. 2003-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/1879 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/east_pacific/fanning_2003.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/east_pacific/fanning_2003.txt English https://www.ncdc.noaa.gov/paleo/study/1879 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/east_pacific/fanning_2003.txt 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 -159.2 3.9 -159.2 3.9