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最後の脱氷期における海洋と大気における同期的な百年の突然の出来事
Tianyu Chen1, Laura F Robinson2, Andrea Burke3
1Bristol Isotope Group, School of Earth Sciences, University of Bristol, Bristol, UK. tc14502@bristol.ac.uk.
まとめ
大気中のCO2が急激に増加したのは 氷河解凍の時期です 深海のサンゴから得られた放射性炭素のデータは 強い大西洋循環と関連した 2つの"オーバーショット"現象を明らかにし 気候変動に影響を与えています
科学分野:
- 古代気候学
- 海洋学
- 気候科学
背景:
- 南極の氷の核は,最後の脱氷期 (18,000〜11,000年前) の間にCO2の急速な増加を示しています.
- 海洋循環の役割を理解するには 高解像度の海洋記録が必要です
研究 の 目的:
- 過去の氷河解凍期における 海洋循環と大気中の二酸化炭素の変化との関連を調査する.
- 海洋循環の変化のタイミングと性質を定めるため
主な方法:
- 赤道大西洋とドレイク海峡の 深海サンゴの放射性炭素年代測定
- 過去2万5千年の正確な年代測定のためのウラン・トリウム年代測定
主要な成果:
- 放射性炭素の2つの重要なシフトが検出されました 百年CO2上昇と一致しています 14.8kと11.7k年前のことです
- これらのシフトは,短命 (<500年) の海洋循環"超越"イベントを示しています.
- 大西洋南極の転覆循環は,これらのイベント中に存在したより強いものでした.
結論:
- 海の循環と 百年の気候現象は 最後の氷河解凍期に 密接に結びつきました
- 海洋循環のダイナミクスが 急激な気候変動に 重要な役割を果たす証拠があります
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