珊瑚の骨格のストロンチウム/カルシウム比から見た海面温度

J W Beck, R L Edwards, E Ito

Science (New York, N.Y.)

|July 31, 1992

まとめ

珊瑚のストロンチウム/カルシウム比は,過去の熱帯海面温度 (SST) を明らかにします. この方法は,歴史的なSSTを正確に再構築し,脱氷期中により寒く,より変動する熱帯気候を示します.

科学分野:

古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
地質化学地質化学
海洋学海洋学とは

背景:

過去の熱帯気候の変動性を理解することは,将来の気候変動を予測するために不可欠です.
珊瑚の骨格は,環境条件を記録する地球化学的代理物を保存します.

研究の目的:

過去の熱帯海面温度 (SST) を,サンゴの地化学を用いて再構築する.
最後の脱氷期におけるSSTと季節性の変化を調査する.

主な方法:

熱イオン化質量スペクトロメトリを用いたサンゴのストロンチウム/カルシウム比の高精度測定.
現代のサンゴと酸素同位体温度計を用いたSST-プロキシ関係の校正.
過去のSSTと季節的変動を決定するために,化石サンゴの分析.

主要な成果:

再構築されたSSTは,0.5°Cより優れた表面的な精度を持つ.
化石サンゴのデータによると,年間平均SSTは,バヌアトゥの近くで10,200年前に約5度Cの低温であった.
季節的なSSTの変動は,現在の状況と比較して過去により大きかった.

結論:

珊瑚のSr/Ca比率は,何千年もの時間スケールにおける熱帯のSSTを再構築するための信頼できるプロキーを提供します.
熱帯気候地帯は,脱氷期中に赤道に向かって圧縮された.
過去の気候再構築は,熱帯地域のグローバルな気候変化に対する感受性についての洞察を提供します.

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