過去3つの氷河期間の東南極全域の均質な気候変動
O Watanabe1, J Jouzel, S Johnsen
1National Institute of Polar Research, 9-10 Kaga 1-chome, Itabashi-ku, Tokyo 173, Japan.
Nature
|April 4, 2003
まとめ
氷核からの南極気候記録は,東南極高原全体でほぼ均一である. 富士山ドームからの新しいデータは,ヴォストックで見つかったものと似た氷河期間の気候変化を確認し,大規模な気候再構築をサポートしています.
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
- 氷河学 氷河学とは
- 気候科学 気候科学
背景:
- 氷の核の研究は,南極の気候の変化が地域によって異なる可能性があることを示唆しています.
- 以前の不均一な気候の発見は,ロス海セクターに限られていた.
- これは,ヴォストクのような大規模な気候記録の妥当性について疑問を投げかけます.
研究 の 目的:
- 南極の東南極の気候の均質性を調査するために.
- ドーム・フジの氷芯記録とヴォストークの記録を比較するために.
- 南極の古気候データの空間的代表性を評価する.
主な方法:
- 東南極のドーム・フジで氷の芯を掘った.
- 富士山ドームの氷芯の同位体成分を分析した.
- ドーム・フジの同位体プロファイルと,過去3つの氷河期間のヴォストークの氷芯記録を比較した.
主要な成果:
- 富士山ドームとヴォストークの記録は,主要な気候現象 (終結期,氷河間期,氷河間期) の驚くべき類似性を示しています.
- 微妙な氷河現象も,降雨の起源を考慮した後でも,この2つの記録の間に一致しています.
- データは過去3つの氷河周期をカバーし,実質的な時間的な比較を提供します.
結論:
- 南極の気候は,東南極高原全体で本質的に均質である.
- この均質性は,高原と周辺の海の対称性によるものかもしれない.
- この発見は,東南極の氷核からの大規模な気候再構築の妥当性を裏付けている.
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