Barbados Oxygen Isotope Data (delta 18O) for the Late Pleistocene

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What does this data set describe?

Title:
Barbados Oxygen Isotope Data (delta 18O) for the Late Pleistocene
Abstract:
Coral-based delta18O time-series derived from measurements made on submerged or drowned coral reef sequence. The core samples used have been described elsewhere (cf. Fairbanks, 1989; Guilderson et al., 1994). Measurements were made on three different species of corals: the reef-crest Acropora palmata and the mixed or buttress zone species Montastrea annularis and Porites asteroides. Linear growth rates of individual corals were determined by using the low density to high-density band distance as an approximate annual chronometer. To minimize growth-rate kinetic induced effects, we only analyzed specimens with similar linear growth rates and from the same relative position within the corals. Typical linear extension rates were 5mm/year for all specimens analyzed and ranged from 3 to 7 mm/year. Two to four parallel transects encompassing 4-8 years per transect were extracted using a micro dental drill along the main vertical growth axis. To minimize the potential for skeletal inhomogeneities, we attempted to only sample theca (walls), except for the P. asteroides specimens whose skeletal architecture is too fine for theca sampling. A. palmata specimens were only sampled along the upper growing surface as deduced from the skeletal architecture observed in x-radiographs. We used x-ray diffraction analysis of drilled and ground specimens to confirm that the aragonite was pristine as indicated by the absence of any calcite peaks (detection limit 0.5 weight percent). The sampling protocol did not convert aragonite to calcite. Living specimens collected over the last ~20 years were treated in a similar fashion to the offshore cores. Samples (100-200óg) were reacted at 90óC in a Carousel-48 device and analyzed on a Finnigan MAT 251 isotope ratio mass spectrometer. Calibration is through secondary standards calibrated via NBS (now NIST SRM) standards 16, 17, 19, and 20. Analytical precision of concurrently analyzed standards is better than ó0.05" (1-sigma) for both oxygen and carbon. Data is reported in d-notation relative to Pee Dee Belemnite using the defined values of NBS-20 (d18O -4.14" PDB, d13C -1.06" PDB). We have not corrected the absolute values of our results for the "acid-alpha" difference between aragonite (samples) and calcite (standards). Radiocarbon and 230Th/234U chronological control is provided by previously reported radiocarbon and Th/U TIMS measurements (Fairbanks 1989; 1990; Bard et al., 1993), supplemented by additional measurements (Fairbanks et al., in prep.). The majority of samples through the deglaciation have been dated with both techniques. M. annularis specimens older than 15.7 14C kyrs have yet to be Th/U dated. Absolute ages for these specimens are interpolated using a least squares regression through the appropriate coral data (Fairbanks et al., in prep.). Ice volume residual Dd18O is calculated in a similar fashion to Guilderson et al., (1994). In specimens older than the last glacial maximum as determined by the A. palmata Barbados sea level record, the residual is calculated using an ice volume component of 1.1".
  1. How should this data set be cited?

    Guilderson, T.P., Fairbanks, R.G., and Rubenstone, J.L., 200102, Barbados Oxygen Isotope Data (delta 18O) for the Late Pleistocene: World Data Center for Paleoclimatology Data Contribution Series 2001-010, World Data Center for Paleoclimatology, Boulder, Boulder.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -60
    East_Bounding_Coordinate: -60
    North_Bounding_Coordinate: 13
    South_Bounding_Coordinate: 13

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: unknown
    Currentness_Reference: Publication Date

  5. What is the general form of this data set?

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

    2. What coordinate system is used to represent geographic features?

  7. How does the data set describe geographic features?

    coral variable
    coral variable (Source: coral variable)

    del18O
    delta 18O (per mil) relative to PDB (Source: Craig, H., 1957. Isotopic standards for mass spectrometric analysis of carbon dioxide. Geochimica Cosmochimica Acta, 12:113-140)

    Range of values
    Minimum:unknown
    Maximum:unknown
    Units:per mil
    Resolution:0.01

    d18O_PD
    delta 18O relative to present (Source: T.P. Guilderson, R.G. Fairbanks, J.L. Rubenstone Tropical Atlantic coral oxygen isotopes: glacial-interglacial sea surface temperatures and climate change. Marine Geology, 172, 75-89, 2001.)

    Range of values
    Minimum:unknown
    Maximum:unknown
    Units:unknown
    Resolution:.01

    Dd18O
    delta 18O equivalent to ice volume corrected residual (Source: T.P. Guilderson, R.G. Fairbanks, J.L. Rubenstone Tropical Atlantic coral oxygen isotopes: glacial-interglacial sea surface temperatures and climate change. Marine Geology, 172, 75-89, 2001.)

    Range of values
    Minimum:unknown
    Maximum:unknown
    Units:unknown
    Resolution:.01


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    T.P. Guilderson, R.G. Fairbanks, J.L. Rubenstone Tropical Atlantic coral oxygen isotopes: glacial-interglacial sea surface temperatures and climate change. Marine Geology, 172, 75-89, 2001.

  3. To whom should users address questions about the data?


Why was the data set created?

Paleoclimatic Research


How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

  3. What similar or related data should the user be aware of?


How reliable are the data; what problems remain in the data set?


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA

  1. Who distributes the data set? (Distributor 1 of 1)

    NOAA Paleoclimatology Program
    Data Manager
    325 Broadway, Code E/CC23
    Boulder, Colorado 80305-3328
    U.S.A.

    (303) 497-6280 (voice)
    (303) 497-6513 (FAX)
    paleo@noaa.gov

    Hours_of_Service: 9-5 MST Monday-Friday
  2. What's the catalog number I need to order this data set?

    Other Documents

  3. What legal disclaimers am I supposed to read?

    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.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 31-Mar-2011
Last Reviewed: 31-Mar-2011
Metadata author:
NOAA Paleoclimatology Program
Data Manager
325 Broadway, Code E/CC23
Boulder, Colorado 80305-3328
U.S.A.

(303) 497-6280 (voice)
(303) 497-6513 (FAX)
paleo@noaa.gov

Hours_of_Service: 9-5 MST Monday-Friday
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


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