温暖なミオセンの間,酸素が豊富にある東の熱帯太平洋
Anya V Hess1, Alexandra Auderset2,3, Yair Rosenthal4,5
1Department of Earth and Planetary Sciences, Rutgers, The State University of New Jersey, Piscataway, NJ, USA. anya.hess@gmail.com.
Nature
|June 28, 2023
まとめ
暖かいミオセンの気候最適期に海洋の酸素不足地帯 (ODZ) が拡大した. これは 熱帯太平洋の現在の脱酸素化傾向が 地球温暖化が続くと 逆転する可能性があることを示唆しています
科学分野:
- 古代海洋学
- 気候科学
- 海洋生物化学
背景:
- 海洋の酸素含有量は気候変動により,特に酸素不足地帯 (ODZ) で減少しています.
- 地球システムモデルは2100年までODZの拡大を予測しているが,長期的な対応は不確実である.
研究 の 目的:
- 現在より温暖なミオセンの気候最適期 (MCO) における海洋酸素化の変化を調査する.
- 温暖化現象に対する海洋の酸素化の長期的反応を理解する.
主な方法:
- ODZの範囲と強度のためのプロキシとして,分析されたプランクティックフォラミニフェラ I/Caとδ15Nのデータ.
- 海面温度を再構築するためにMg/Caデータを用いた.
- パレオセアノグラフィのデータと地球システムモデルのシミュレーションを比較.
主要な成果:
- 東部熱帯太平洋 (ETP) の溶けた酸素濃度は,MCO中に100μmol kg−1を超えました.
- 西から東への気温グラデーションの上昇とETP熱線の群集により,ODZが形成された.
- 暖かい時期の弱い貿易風は,ETPの上昇を減らし,生産性と酸素需要を東に集中させる可能性があります.
結論:
- MCOのような温暖な気候状態は,海洋の酸素化パターンに影響します.
- 発見は,将来の温暖化シナリオの下での最近の脱酸素化傾向とETP ODZの拡大の可能性を示唆するモデルを支持する.
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