過去25万年の間,地中海西部の急激な温度変化が起こった
Belen Martrat1, Joan O Grimalt, Constancia Lopez-Martinez
1Department of Environmental Chemistry Institut d'Investigacions Quimiques i Ambientals de Barcelona-Consell Superior d'Investigacions Cientifiques (CSIC), 08034-Barcelona, Spain.
まとめ
地中海西部の急激な海面温度 (SST) 変化は,過去25万年の温暖化期間により頻繁に起こりました. これらの温暖化現象は,冷却期と比較して,より高い強度とより速い変化率を示しました.
科学分野:
- 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
- マリン・ジオケミストリー 海洋地化学
- クォーターナー期気候ダイナミクス
背景:
- 過去の気候変動の変動を理解することは,将来の気候変動を予測するために不可欠です.
- 西地中海地域は,様々な気候強制への感受性があるため,気候の動態を研究するための重要な地域です.
- アルケノン基の海面温度 (SST) 記録は,過去の海洋状態に関する高解像度の洞察を提供します.
研究 の 目的:
- 過去25万年の西地中海のSST記録を高解像度で再構築する.
- 異なる気候状態における突然の気候変動の頻度,強度,速度を調査する.
- 異なる海洋同位体段階 (MIS) の間の急激な気候変動パターンを比較する.
主な方法:
- 西地中海から得られたアルケノン製の連続した高解像度SST記録の分析.
- 海洋同位体段階を含む,過去25万年にわたる古気候データの調査.
- 温暖化と冷却の段階におけるSSTの変動パターンの比較と,異なるMISにおけるSSTの変動パターンの比較.
主要な成果:
- 急激なSSTの変化は,冷却期よりも温暖化期間により一般的であることが判明しました.
- MIS 6では,SSTの振動は,スタジアムからスタジアム間のパターンを示したが,MIS 3の Dansgaard/Oeschgerイベントよりも,より低い強度と遅い変化率を示した.
- 最も顕著な急激な気候現象は,安定した,暖かい氷期間の状態が長期間続いた後,MIS 5とMIS 7の間に観察されました.
結論:
- 西地中海は,過去25万年にわたって,より頻繁な急激な温暖化現象を経験しました.
- 氷河間期間の気候の安定は,より顕著な急激な気候変化に先行する可能性があります.
- この研究は,他の古気候記録と比較して,急激な気候変動のダイナミクスにおける地域的な違いを強調しています.
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For example, increasing the temperature of one gram of water by 1°C requires one calorie of heat energy and can be written as 1 cal/g-°C, or 4186 J/kg/K.
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