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Evolution of Staircase Structures in Diffusive Convection
Published on: September 5, 2018
降氷期における同期的な熱帯南シナ海SSTの変化とグリーンランドの温暖化
M Kienast1, S Steinke, K Stattegger
1Earth and Ocean Sciences, University of British Columbia, Vancouver, B.C. Canada V6T 1Z4. kienast@unixg.ubc.ca
Science (New York, N.Y.)
|March 17, 2001
まとめ
熱帯海は,地球温暖化に大きく影響している. 新しい海面温度記録は,最後の氷河期の終わりに,高緯度気候のシフトと同期的な温暖化イベントを明らかにしています.
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
- 海洋学 海洋学 海洋学
- 気候科学 気候科学
背景:
- 熱帯海は,世界の気候の動態の主要な原動力である.
- 過去の急激な気候現象を理解するには,熱帯と高緯度の気候変動の間の正確な段階的配分が必要です.
- 過去の急激な気候現象は,地球規模の気候変動のメカニズムについての洞察を提供します.
研究 の 目的:
- 最後の氷河期における熱帯海面温度 (SST) の変動を再構築する.
- 高緯度イベントに関連した熱帯気候の変化のタイミングを決定する.
- 熱帯海洋温暖化とボーリング温暖化現象の間の同期性を調査する.
主な方法:
- SST記録を生成するために,熱帯南シナ海からの堆積物核のアルケノン分析.
- 精密な時間的枠組みを確立するために,堆積物核の放射線年代測定.
- 熱帯のSST記録を,氷の核などの既成の古気候アーカイブと比較.
主要な成果:
- 最新の氷河期の終わりに,少なくとも1°Cの熱帯南シナ海SSTの急激な増加が確認されました.
- このSST増加は,年代測定の不確実性の中で,ボーリング温暖化イベントと同期しています.
- ボーリング温暖化現象は,グリーンランド氷床プロジェクト2の氷芯が示すように,約14万6千年前に発生した.
結論:
- 熱帯海洋の温度は,最後の氷河期末の主要な気候変化に迅速に反応した.
- 観測された同期性は,熱帯海の温暖化と高緯度の気候現象の間の潜在的な遠隔接続を示唆しています.
- これらの発見は,急激な温暖化期間中に地球温暖化を引き起こすメカニズムについての理解を深める.
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