Mg/Ca thermometry of planktonic foraminifera and application to paleoceanography

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  • Sagawa Takuya
    Center for Advanced Marine Core Research, Kochi University Present address: Senior Research Fellow Center, Ehime University

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  • 浮遊性有孔虫Mg/Ca古水温計の現状・課題と古海洋解析への応用例
  • フユウセイ ユウコウチュウ Mg Ca コ スイオンケイ ノ ゲンジョウ カダイ ト コ カイヨウ カイセキ エ ノ オウヨウレイ
  • Mg/Ca thermometory of planktonic foraminifera and application to paleoceanography (in Japanese with English abstract)

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Planktonic foraminiferal Mg/Ca thermometry has been used in reconstructing past surface-ocean temperature from deep-sea sediments. Mg/Ca paleothermometry has the advantages of enabling reconstructions of past temperature with a precision of ±1° and reconstructions of salinity when combined with oxygen isotope measurements of foraminiferal shell. Previous paleoceanographic studies that employed this method have shed light on the important role of oceanic variability in global climate change at various time scales. However, the method has some limitations, including the fact that carbonate dissolution in the deep sea modifies the Mg/Ca value of foraminifera. The application of Mg/Ca thermometry to paleoceanographic studies, taking into account its basis and limitations, represents a powerful tool in terms of understanding the global climate system. This paper summarizes the principles, applications to paleoceanography, problems, and perspectives of Mg/Ca thermometry.

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