Sr thermometer for Porites coral: Little need to measure Ca?

Access this Article

Search this Article

Author(s)

Abstract

Cubic sub-samples of 1 mm<sup>3</sup> (about 0.5 mg) were obtained from a <i>Porites</i> coral slice collected from Xisha Island, South China Sea and analysed for Sr and Ca concentrations by ID-TIMS after precise weighing. Ca contents in the coral are quite uniform (mean = 38.16 wt%, 2σ = 0.11 wt%). The variation corresponds to ±0.4°C, about the level of uncertainty of the Sr/Ca-SST calibration. Sr concentrations and Sr/Ca ratios covary linearly, and the line can be defined by the equation Sr/Ca × 10<sup>3</sup> = 0.111Sr - 0.5061 (correlation coefficient <i>r</i> = 0.9955), where Sr is in μmol/gm. Consequently, our results demonstrate that the previously established coral Sr/Ca thermometer, Sr/Ca × 10<sup>3</sup> = A + B × T, can be simplified as a Sr thermometer, 0.111Sr - 0.5061 = A + B × T, where Sr is in μmol/gm. Therefore, measurement of Ca in corals could be unnecessary. If different levels of impurity exist in different corals, a few Ca measurements in each coral may be needed, but definitely there is no need to measure every sub-sample.

Journal

  • GEOCHEMICAL JOURNAL

    GEOCHEMICAL JOURNAL 33(5), 351-354, 1999-10-01

    GEOCHEMICAL SOCIETY OF JAPAN

References:  16

Cited by:  1

Codes

  • NII Article ID (NAID)
    10008804389
  • NII NACSIS-CAT ID (NCID)
    AA00654975
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    00167002
  • NDL Article ID
    4871818
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z53-R488
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
Page Top