サンゴ骨格の酸素同位体比とその変動幅 : 海洋表層の水温と塩分の水平分布復元に向けて  [in Japanese] The oxygen isotope ratio in coral skeletons and its variable range: toward spatial reconstruction of sea surface temperatures and salinity  [in Japanese]

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Author(s)

    • 森本 真紀 MORIMOTO Maki
    • 名古屋大学大学院環境学研究科(21世紀COEプログラムNo.G-4「太陽・地球・生命相互作用系の変動学」) Graduate School of Environmental Studies (Dynamics of the Sun-Earth-Life Interactive System, No. G-4, the 21st Century COE Program), Nagoya University

Abstract

Although tropical oceans are a key component of the global climate system, their behavior in the past - even only a few decades ago - remains poorly characterized. Coral skeletons can provide several centuries of continuous paleoclimatic records with weekly to annual resolution. The skeletal oxygen isotope ratio (δ<sup>18</sup>O) is one of the most commonly used coral-based paleoclimatic proxies. The skeletal δ<sup>18</sup>O values reflect a combination of temperature and the δ<sup>18</sup>O of ambient surface seawater, and seawater δ<sup>18</sup>O and sea surface salinity are affected by similar factors. Many calibration studies have sought to validate skeletal δ<sup>18</sup>O as a paleoclimatic tracer and to define the relationship between skeletal δ<sup>18</sup>O, temperature, seawater δ<sup>18</sup>O and salinity. The time resolution of this calibration is increasing; it currently occurs biweekly in the Palau Islands in the tropical Western Pacific. Generally, changes in sea surface temperature and seawater δ<sup>18</sup>O have almost the same effect on changes in skeletal δ<sup>18</sup>O, both temporally and spatially. Local contribution rates of these two factors to skeletal δ<sup>18</sup>O differ owing to regional climatic conditions. Parallel studies of detailed calibrations and an expansion of coral skeletal δ<sup>18</sup>O datasets over the next decade are anticipated to lead to many developments in paleoclimatic understanding.

Journal

  • Chikyukagaku

    Chikyukagaku 38(4), 241-254, 2004

    The Geochemical Society of Japan

References:  62

Codes

  • NII Article ID (NAID)
    110008680082
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    REV
  • ISSN
    0386-4073
  • NDL Article ID
    7212925
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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