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北大西洋の最後の脱氷のタイミングは,気候記録として記録されています
C Waelbroeck1, J C Duplessy, E Michel
1Laboratoire des Sciences du Climat et de l'Environnement, Domaine du CNRS, bât. 12, 91198 Gif-sur-Yvette, France. Claire.Waelbroeck@lsce.cnrs-gif.fr
Nature
|August 17, 2001
まとめ
北大西洋の海洋沈殿物の放射性炭素年代測定は,表面水の年齢が変動しているため,修正が必要です. これらの貯水池の年齢の変化は,最後の脱氷期における過去の気候記録に影響を与えました.
科学分野:
- パレオセアノグラフィー
- 気候科学 気候科学
- ジオクロノロジー (Geochronology) について
背景:
- 大陸の気候記録と海洋の気候記録を調和させることは,脱氷を理解する上で極めて重要です.
- 海洋堆積物の放射性炭素年代測定は,表面水の表面年齢 (貯水池の年齢) が一定であるという仮定に基づいています.
研究 の 目的:
- 北大西洋の地表水の変動を調査するために,過去2万年にわたって明らかに年齢を測定しました.
- 脱氷イベントのより正確な時間的枠組みを提供するために.
主な方法:
- 北大西洋 (北緯40度以北) の2つの堆積物核の分析.
- 放射性炭素年代測定法で,過去表面水の年齢を明らかにする.
主要な成果:
- 表面水の表面年齢は,現在と比較して,ハインリッヒ1号とヤンガー・ドライアスのイベントの間,著しく高かった.
- 目に見える年齢は,Bølling-Allerødのインタースタジアムでの現在の値と比較可能でした.
- 1,230 +/- 600から1,940 +/- 750年 (ハインリッヒ1) と820 +/- 430から1,010 +/- 340年 (若いドライア) の変動が確認されています.
結論:
- 北大西洋の貯水池の年齢が一定であるとの仮定は無効であり,海洋放射性炭素年代測定の修正が必要である.
- 最後の脱氷期における氷芯と海洋記録の間の年代順を調整した.
- 古代海洋学の研究における貯水池年齢の変動を考慮することの重要性を強調した.
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