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最後の氷河期における陸地での6°Cの広範な冷却
Alan M Seltzer1, Jessica Ng2, Werner Aeschbach3
1Marine Chemistry and Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA. aseltzer@whoi.edu.
Nature
|May 13, 2021
まとめ
最後の氷河期 (Last Glacial Maximum,LGM) の間,地球温暖化が顕著であった. 古代の地下水中の高貴なガスは,低緯度の陸地表面で5.8°Cの冷却を明らかにし,気候の感受性を推定するのに役立ちます.
科学分野:
- 古代気候学
- 地化学
背景:
- 最後の氷河期 (Last Glacial Maximum,LGM) の間における地球温暖化の見積もりは,地球の気候の感受性を理解する上で極めて重要です.
- 低緯度の温度プロキシの不一致は,正確な気候再構築を妨げます.
- 地下水中の高貴なガスは,その物理的特性により,過去の陸地表面温度を再構築するための信頼できる方法を提供します.
研究 の 目的:
- 低緯度地上のLGM温度記録のデータギャップを埋めるため
- LGMの地表温度を空間的に包括的に再構築する.
- 地球の気候の感受性を 制限するためです
主な方法:
- 古代地下水に溶けた貴重ガス (ヘリウム,ネオン,アルゴンなど) の分析
- 過去の温度のプロキシとして,高温依存の溶解性を利用する.
- 統一された物理的な枠組みの中で,地球上の地下水の高貴なガスのデータを解釈する.
主要な成果:
- LGMの間,低緯度から中緯度 (45°Sから35°N) の陸地表面で 5. 8 ± 0. 6°Cの有意な冷却が示されました.
- 6つの大陸から新しい熱帯記録と広範なデータを取り入れました.
- 最近の海洋プロキシデータの同化再構築により,より高い気候感受性を示唆する幅広い支持を得ました.
結論:
- ノーブルガスの古熱計は,低緯度の地上の地域のための堅固なLGM温度データを提供します.
- 再構築された冷却は,以前に推定されたより高い気候感受性を示すモデルをサポートします.
- この研究により 氷河期における 地球温暖化現象の理解が深まっています
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