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熱帯太平洋の1200万年の温度史
Yi Ge Zhang1, Mark Pagani, Zhonghui Liu
1Department of Geology and Geophysics, Yale University, New Haven, CT 06511, USA.
まとめ
300万年前以前の恒久的なエルニーニョのような状態は,新しい海面温度 (SST) データによって支持されていません. 私たちの発見は,1200万年前のより温暖な太平洋温水池を明らかにし,以前の気候再構築に挑戦しています.
科学分野:
- パレオセアノグラフィー
- 気候科学 気候科学
- マリン・ジオケミストリー 海洋地化学
背景:
- 以前の研究では,永久的なエルニーニョのような状態が300万年前以前に存在していたことが示唆されていました.
- これらの結論は,ダイアゲネシスと校正の問題によって潜在的に影響を受ける限られた海面温度 (SST) レコードに基づいています.
研究 の 目的:
- 太平洋からより信頼できるSST記録を再構築するために.
- ネオゲンにおける恒常的なエルニーニョのような状況の存在を再評価する.
主な方法:
- 新しいバイオマーカーベースのSST記録を確立しました.
- 太平洋の暖かいプールと冷たい舌の温度の変化を分析した.
- 定量化された赤道地帯の温度グラデーションを時間とともに測定する.
主要な成果:
- 太平洋の温水池は,1200万年前より約4°C暖かかった.
- 温かいプールと冷たい舌の両方が,現代的な温度に向かって徐々に冷却されました.
- ミオセンの末期には安定したゾーン温度グラディエント (~3°C) が維持され,プレオ・プレイストセンの頃には上昇した.
結論:
- この発見は,永久的なエルニーニョのような状態を示唆する以前の再構築と矛盾しています.
- ネオゲン太平洋の気候は徐々に進化し,不変のエルニーニョのような条件によって特徴づけられていない.
- 新しいSSTデータは,過去太平洋の気候動態をより正確に理解できるようにしています.
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