T. Guilderson D. Schrag E. Goddard M. Kashgarian G. Wellington B. Linsley 2000/10 World Data Center for Paleoclimatology Data Contribution Series 2000-062 Boulder World Data Center for Paleoclimatology, Boulder Rarotonga coral radiocarbon (14C) timeseries. Coral radiocarbon (Delta-14C) on untreated, low-speed drilled samples. Precision is ±4 per mil as documented by an in-house homogenized coral standard, and presented as AGE CORRECTED DELTA-14C [see Stuiver Polach, 1977]. The sample cores were made on a Porites lutea coral located in open marine conditions off Rarotonga. Cores were split and cleaned with distilled water. After identifying the major vertical growth axis, the coral was sequentially sampled at 1 mm increments with a low-speed drill. Splits (~1 mg) were reacted in vacuo in a modified autocarbonate device at 90°C and the purified CO2 analyzed on a gas source stable isotope ratio mass spectrometer. Additional splits were analyzed by ICP-AES for Sr, and Ca. The delta-18O and [Sr/Ca] results were individually mapped to the Kaplan OI and IGOSS sea surface temperature time-series for the grid box containing Rarotonga. The resulting age model indicates an average linear extension rate on the order of 16mm/yr with an estimated age-model error of ±1 month. For the interval 1959-1997, approximately every other sample was analyzed for 14C (~8samples/yr), and for the interval 1950-1959 every sample was analyzed. Splits (~10mg) were placed in individual reaction chambers, evacuated, heated, and then acidified with orthophosphoric acid at 90°C. The evolved CO2 was purified, trapped, and converted to graphite in the presence of cobalt catalyst in individual reactors [Vogel et al., 1987]. Graphite targets were measured at the Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory [Davis et al., 1990]. Radiocarbon results are reported as Delta-14C (”) as defined by Stuiver and Polach [1977] and include the d13C correction obtained from the stable isotope results and are "age corrected". Analytical precision and accuracy of the radiocarbon measurements is ±4” (1s) based on repeated analyses of an in-house homogenized near-modern coral and accepted secondary and tertiary radiocarbon standards. In keeping with the definition of "high-precision radiocarbon" (<3 per mil, 1-sigma) data have been rounded to zero significant figures. Paleoclimatic Research G2082 National Geophysical Data Center http://www.ngdc.noaa.gov/paleo/corals.html 1 1950 1997 Publication Date Complete None Planned -159.82 -159.82 -21.23 -21.23 CoRIS Theme Keywords Version 1.0 EARTH SCIENCE > Paleoclimate > Coral Records > radiocarbon EARTH SCIENCE > Paleoclimate > Coral Records > Sr/Ca EARTH SCIENCE > Paleoclimate > Coral Records > delta 18O EARTH SCIENCE > Paleoclimate > Coral Records > delta 14C EARTH SCIENCE > Paleoclimate > Coral Records > linear extension rate Numeric Data Sets > Paleoclimatology CoRIS Place Keywords Version 1.0 COUNTRY/TERRITORY > Cook Islands > Rarotonga > Rarotonga (21S159W0001) OCEAN BASIN > Pacific Ocean > South Pacific Ocean > Southern Cook Islands > Rarotonga (21S159W0001) CoRIS Temporal Keywords Version 1.0 Holocene, Modern None PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA Guilderson, T.P., D.P. Schrag, E. Goddard, M. Kashgarian, G.M., Wellington, and B.K. Linsley, 2000, Southwest subtropical Pacific surface water radiocarbon in a high-resolution coral record. Radiocarbon, 42 (2), 249-256, 2000. coral variable coral variable coral variable del14C delta 14C (per mil) Druffel, E. M., 1981, Radiocarbon in annual coral rings from the eastern tropical Pacific Ocean: Geophysical Research Letters, v. 8, p. 59-62. unknown unknown per mil 0.01 NOAA Paleoclimatology Program Bruce Bauer Data Manager Mailing Address

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Boulder CO 80305-3328 U.S.A. (303) 497-6160 (303) 497-6958 (303) 497-6513 paleo@ngdc.noaa.gov 9-5 MST Monday-Friday Disclaimer- While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. ASCII ftp://ftp.ngdc.noaa.gov/paleo/coral/east_pacific/rarotonga_2000.txt ftp://ftp.ngdc.noaa.gov/paleo/coral/east_pacific/rarotonga_2000.xml Data can be obtained from http://www.ngdc.noaa.gov/paleo and via anonymous ftp to ftp.ngdc.noaa.gov. Diskette and paper copies may be obtained by mail. Diskette cpio On-line data are available free of charge, other forms are available for the cost of reproduction Contact the Data Center to order paper copies of data 4 days 20010816 NOAA Paleoclimatology Program Carissa Carter c/o Data Manager Mailing Address

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