T. Guilderson D. Schrag M. Kashgarian J. Southon 1999/08 World Data Center for Paleoclimatology Data Contribution Series 1999-043 Boulder World Data Center for Paleoclimatology, Boulder Nauru-2 coral radiocarbon (14C) timeseries. (166E, 0.5S, 14m bottom depth). 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]. Cores were taken from a 1.6 meter Porties spp coral on the north side of Nauru Island (166E 0.5S), 14m bottom depth, in July of 1995 by D. Schrag M. Moore. Cores were split and cleaned with distilled water. After identifying the major vertical growth axis, the coral was sequentially sampled at 2 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. The remaining sample splits (~10 mg) 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 (ä) as defined by Stuiver and Polach [1977] and include the d13C correction obtained from the stable isotope results. Analytical precision and accuracy of the radiocarbon measurements is ±4ä (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. The age model for these data was derived from a preliminary delta-13C age model which was then optimized by mapping the delta-18O data to a local instrumental precipitation record. Age model errors are estimated (brute force approach) at ±2-3 months. Paleoclimatic Research G2060 National Geophysical Data Center http://www.ngdc.noaa.gov/paleo/corals.html 1 1947 1995 Publication Date Complete None Planned 166 166 -0.5 -0.5 CoRIS Theme Keywords Version 1.0 EARTH SCIENCE > Paleoclimate > Coral Records > delta 14C EARTH SCIENCE > Paleoclimate > Coral Records > radiocarbon Numeric Data Sets > Paleoclimatology CoRIS Place Keywords Version 1.0 COUNTRY/TERRITORY > Nauru > Nauru > Nauru (00S166E0000) OCEAN BASIN > Pacific Ocean > Central Pacific Ocean > Nauru > Nauru (00S166E0000) CoRIS Temporal Keywords Version 1.0 Holocene, Modern None Please cite original reference when using this data. Guilderson, T.P., D.P. Schrag, M. Kashgarian and J. Southon, 1998. Radiocarbon Variability in the Western Equatorial Pacific Inferred from a High-Resolution Coral Record from Nauru Island J. of Geophysical Research 103, 24641-24650. 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/west_pacific/nauru_1999.txt ftp://ftp.ngdc.noaa.gov/paleo/coral/west_pacific/nauru_1999.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 the data. 4 days 20011002 NOAA Paleoclimatology Program Carissa Carter Mailing Address

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Boulder Colorado 80305-3328 United States (303) 497-6160 (303) 497-6958 carissa.l.carter@noaa.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 No Constraints No Constraints 3825 162 1000000161 20011113 20011218