サンゴ骨格のSr/Ca温度計  [in Japanese] A Sr/Ca thermometer in coral aragonite  [in Japanese]

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Author(s)

    • 佐藤 悠介 SATO Yusuke
    • 琉球大学理学部海洋学科|(現) 北海道大学大学院地球環境科学研究科 Department of Marine Sciences, University of Ryukyus|(Present address) Graduate School of Environmental Earth Science, Hokkaido University

Abstract

The strontium to calcium ratio of coral aragonite is mainly controlled by three factors: (1) the strontium distribution coefficient between aragonite and seawater, (2) the Sr<sup>2+</sup>/Ca<sup>2+</sup> ratio of the surface oceanic water, and (3) biological effects. The mean oceanic residence time of strontium and calcium are calculated to be 4.9×10<sup>6</sup> years and 1.0×10<sup>6</sup> years, respectively. Therefore, the Sr/Ca ratio in seawater is considered to be quite uniform throughout the world's surface seawater. If biological effects are considered to be negligible, Sr/Ca ratio of coral aragonite can vary as a simple function of temperature in which corals have grown. Steve Smith has clearly demonstrated, from a series of careful macrocosm experiments on <i>Pocillopora damicornis</i>, that a relationship exists between Sr/Ca in coral aragonite and ambient seawater temperature. The Sr/Ca ratio in coral aragonite is shown as a simple linear equation of ambient seawater temperature, classified of the "Sr/Ca thermometry". Recent high precision data of Sr/Ca analysed by mass-spectrometer, further calibrated the Sr/Ca thermometer using <i>Porites</i> corals. But recent studies also pointed out spatial variations (〜1%) of surface seawater Sr/Ca. In addition, biological effects such as taxonomy and growth rate are discussed in this paper. Re-evaluation of above three factors will provide a more reliable coral Sr/Ca thermometer.

Journal

  • Chikyukagaku

    Chikyukagaku 35(1), 1-11, 2001

    The Geochemical Society of Japan

References:  38

Cited by:  2

Codes

  • NII Article ID (NAID)
    110008680013
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    5711932
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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