パレオセノ・エオセノ熱極期における熱帯上部海洋における酸素上昇
Simone Moretti1,2, Alexandra Auderset1,3, Curtis Deutsch4
1Climate Geochemistry Department, Max Planck Institute for Chemistry, Mainz, Germany.
Science (New York, N.Y.)
|February 15, 2024
まとめ
地球温暖化によって 海洋の酸素が減少しますが 熱帯の酸素レベルは上昇する可能性があります パレオセーヌ・エオセーヌ熱極期 (PETM) の間には,熱帯の酸素が増加し,大量絶滅を防ぐ可能性があるという証拠がある.
科学分野:
- 古代海洋学
- 気候科学
- 海洋生物学
背景:
- 人類による温暖化によって 地球上の海洋の酸素は減少しています
- 熱帯 地域 の 酸素 の 欠乏 する 地域 の 未来 は 確か で は あり ませ ん.
- パレオセノ・エオセノ熱最大値 (PETM) は,現在の温暖化現象の貴重なアナログを提供します.
研究 の 目的:
- 熱帯海域の酸素濃度を調べるため
- 熱帯北太平洋の酸素不足地帯の温暖化への反応を評価する.
- 酸素濃度の変化が 海洋生物に及ぼす影響を理解するためです
主な方法:
- 過去の酸素レベルを再構築するために,フォラミニフェラに結合した窒素同位体の分析.
- 酸素の可用性の指標としてフォラミニフェラの大きさを測定する.
- 海洋モデルのシミュレーションと経験データを比較する.
主要な成果:
- 窒素同位体はPETMの間,熱帯北太平洋の酸素不足地帯の収縮を示しています.
- フォラミニフェラの大きさは 浅い地下で酸素の供給が増加していることを示唆している.
- 海洋モデルでは 生物学的生産性の低下が 温暖化時に熱帯の地下酸素を増加させるという 発見を裏付けています
結論:
- 熱帯北太平洋はPETMの間に酸素化を経験し,世界的な脱酸素化傾向と対照的です.
- この局所的な酸素増加は 大量絶滅の深刻さを軽減したのかもしれません
- PETMは 将来の海洋学的な 気候変動への対応について 重要な洞察力を提供します
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