ガンブルツェフ山脈と南極の氷床の起源と初期の進化
Sun Bo1, Martin J Siegert, Simon M Mudd
1Polar Research Institute of China, 451 Jinqiao Road, Pudong, Shanghai, 200136, China. sunbo@pric.gov.cn
Nature
|June 5, 2009
まとめ
南極の氷床の形成は,地球温暖化と軌道変化によって引き起こされた. ラダーデータは,ドームAの下にある古代の川の谷を明らかにし,ガンブルツェフ山脈の初期の氷河期を示唆しています.
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
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 約3400万年前の南極の氷床の形成は,地球温暖化,大気中の二酸化炭素の減少,南極環極流との関連があった.
- 数学的モデルによると,氷床の誕生は南極の山脈,特にドームAのガンブルツェフ山脈で起きたと示唆されています.
- 初期の氷河期と氷床の進化については,未知の亜氷河地形による不確実性があります.
研究 の 目的:
- レーダーデータを用いてドームAにあるガンブルツェフ山脈の氷床下地形を調査する.
- 南極の初期の氷河化と,その後の氷床の形成の性質を理解する.
主な方法:
- ドームAの氷床基地の地形図を描くためのレーダーデータの取得と分析.
- 氷河過程と気候史の文脈で露出した地形を解釈する.
主要な成果:
- レーダーデータは,ドームAの氷床の下にある川の渓谷が深いアルプスの地形を明らかにした.
- この風景は,夏の平均気温が約3°Cであった初期の南極氷河期に形成された可能性が高い.
- ガンブルツェフ山脈は,おそらく3400万年以上前のもので,氷床の成長の主要な中心地として機能しました.
結論:
- 保存された亜氷河の地形は,南極の初期の氷河期についての洞察を提供します.
- ガンブルツェフ山脈は,南極の氷床の形成と拡大に重要な役割を果たしました.
- この古代の風景は,約1400万年もの間,氷の下に保存されてきました.
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