西南極の氷の潮制御棒滑り放出
Robert A Bindschadler1, Matt A King, Richard B Alley
1Ocean and Ice Branch, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA. Robert.A.Bindschadler@nasa.gov
まとめ
西南極の氷河の流れは,海洋の潮によって急速に上昇します. この急速な動きは,亜氷河地層のダイナミクスによって引き起こされ,海面の変化に対する氷河流の感受性を強調しています.
科学分野:
- 氷河学 氷河学とは
- 地球科学 地球科学 地球科学
- 海洋学 海洋学とは
背景:
- 西南極の氷河流は,南極の氷床の重要な構成要素である.
- 彼らのダイナミクスは,世界の海面に大きく影響を与えます.
- 彼らの急速な動きを理解することは,将来の氷の減少を予測するために不可欠です.
研究 の 目的:
- 大規模な西南極の氷河流における突然の急速な動きの背後にあるメカニズムを調査する.
- これらの現象を誘発する海洋潮振動の役割を決定する.
- 氷河流の速度の変動を制御する亜氷河過程をモデル化するために.
主な方法:
- 海洋の潮サイクルと同期した氷河流の運動データの分析.
- 亜氷河期内における滑行伝播速度の調査.
- 摩擦ロックされた故障モデルの開発と適用.
主要な成果:
- 氷河流の放出は,短い,急速な動きの期間で, ~1メートルの海洋潮の振動でペースが設定されます.
- 静止状態への加速と減速は,数分以内に起こります.
- ~88 m/sの滑り散布は,スチーア波までの亜氷河期を示唆しています.
- 摩擦ロックされた故障モデルは,観測された準周期的なイベントのタイミングを正確に再現します.
結論:
- 西南極の氷河流は,潮力によって引き起こされる急速な速度変化を示しています.
- 潜在的にシェア波として作用する亜氷河のトールダイナミクスは,滑り散布を制御します.
- 氷河の流れの振る舞いは,亜氷河状態と海面の変動に対して非常に敏感です.
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