Tasmaloum, Vanuatu Fossil Coral SST Reconstruction for 4200 YrBP

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Title:
Tasmaloum, Vanuatu Fossil Coral SST Reconstruction for 4200 YrBP
Abstract:
Vanuatu Fossil Coral SST Reconstruction, 4200 YrBP. Paleobathymetry estimated at 10-15 m. SST reconstruction is based on the analysis of Sr/Ca and U/Ca ratios in corals. For the present study, precision on the Sr/Ca paleothermometer was +/- 1.3 deg C, and +/- 0.9 deg C for the U/Ca paleothermometer. The data consist of reconstructed Sea Surface Temperatures extrapolated from analyses of trace element ratios in a fossil coral head. A date of 4166 +/- 15 calendar yr BP was obtained by the U/Th series technique for the coral. This date corresponds to the cold episode centered around sample #464. A fossil coral from Tasmaloum (Vanuatu) was found between 0.80 and 1.20 m depth in drill core 9A, collected at an altitude of +4.66 m above sea level. Owing to the calculated uplift rate the paleodepth of the Porites can be estimated ~10-15 m. at 4150 years B.P. The surrounding coral assemblages indicate an open shallow marine environment. Sr/Ca and U/Ca analyses were converted to SST, using the following equations: Sr/Ca (10-3 M) = 10.73 - 0.0657SST R = 0.79 U/Ca (10-6 M) = 2.106 - 0.0367SST R = 0.89 In greater than 98% of the samples analyzed, Sr and U reconstructed SST agree well within error. A 47-year-long composite SST curve was then constructed, and monthly SST values were extrapolated. File vanuatu.4200bp.SrCaU.txt: Raw Sr/Ca and U/Ca data. - sample #1 is the youngest, i.e. the one with an estimated age of 4128 +/- 15 BP. - there are some data missing. For U/Ca, it is due to the sample size. When it is too small, we cannot measure U accurrately, and although we got U values, they usually have a %RSD attached to them which is higher than 1%, and I don't feel they are precise enough to be used. For Sr/Ca, we experienced several problems with our machine. When the Sr data looked dubious (i.e. when we had poor stability in the in-house coral standard we analyze during each run) we re-ran the Sr and Ca analyses. In most cases, the two runs agreed within error. When there was a discrepancy between the two runs, we ran the samples a third time (when sample size permitted). Missing Sr/Ca data are those samples too small to allow for a third run. These are raw data. They were then translated into temperature data using the equations presented in the article, averaged and resampled at monthly interval using the Analyseries program.
  1. How should this data set be cited?

    Correge, Thierry, Delcroix, Thierry, Recy, Jacques, Beck, Warren, Cabioch, Guy, and Cornec, Florence Le , 200009, Tasmaloum, Vanuatu Fossil Coral SST Reconstruction for 4200 YrBP: World Data Center for Paleoclimatology Data Contribution Series 2000-060, World Data Center for Paleoclimatology, Boulder, Boulder.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: 167
    East_Bounding_Coordinate: 167
    North_Bounding_Coordinate: -15.67
    South_Bounding_Coordinate: -15.67

  3. What does it look like?

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

    Calendar_Date: bc2200
    Currentness_Reference: Publication Date

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  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)

    SST
    Sea Surface Temperature (Source: unknown)

    Range of values
    Minimum:unknown
    Maximum:unknown
    Units:degree C
    Resolution:0.1

    SrCa
    Sr/Ca Ratio (Source: Beck, J. W., R. L. Edwards, E. Ito, F. Taylor, J. Recy, F. Rougerie, P. Joannot, and C. Henin, 1992, Sea surface temperature from coral strotium/calcium ratios: Science, v. 257, p. 644-647; DeVilliers, S., G. T. Shen, and B. K. Nelson, 1994, Sr/Ca paleothermometry in corals: method calibration and evaluation of Sr/Ca (seawater) and interspecies variability: Geochimica Cosmochimica Acta, v. 58, p. 197-208.)

    Range of values
    Minimum:unknown
    Maximum:unknown
    Units:ratio
    Resolution:1.0

    UCa
    U/Ca Ratio (Source: Shen, G. T., and R. B. Dunbar, 1995, Environmental controls on uranium in reef corals: Geochimica Cosmochimica Acta, v. 59, p. 2009-2024.)

    Range of values
    Minimum:unknown
    Maximum:unknown
    Units:ratio
    Resolution:1.0


Who produced the data set?

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  2. Who also contributed to the data set?

    Correge, T., Delcroix, T., Recy, J., Beck, W., Cabioch, G., and Le Cornec, F., 2000, Evidence for stronger El Nino-Southern Oscillation (ENSO) events in a mid-Holocene massive coral. Paleoceanography, 15(4), 465-470

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Why was the data set created?

Paleoclimatic Research


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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.

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Who wrote the metadata?

Dates:
Last modified: 20-Dec-2012
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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