東南極の太平洋沿岸の出口氷河の急速で気候に起因する変化
B W J Miles1, C R Stokes, A Vieli
1Department of Geography, Durham University, Science Site, South Road, Durham DH1 3LE, UK.
Nature
|August 30, 2013
まとめ
東南極の氷河は,終点の位置に顕著で同期的な変化を示しており,そのほとんどは1990年以降に進んでいる. これらのシフトは,氷床の一部が気候強制に脆弱である可能性があることを示しています.
科学分野:
- 氷河学 氷河学とは
- 気候科学 気候科学
- 南極研究南極研究
背景:
- グリーンランドと西南極の氷河が海面上昇を加速させている.
- 東南極の氷床の縁で薄めることが観察されているが,終点の行動はほとんど不明である.
- 以前の研究では,東南極の氷河の大量損失や氷河の変化を強制する文脈がありませんでした.
研究 の 目的:
- 東南極の出口氷河の終点位置における複数十年間の傾向を分析する.
- 氷河の行動における広範かつ同期的な変化を調査する.
- 氷河の変化と気候/海洋的フォースリングの関係を評価する.
主な方法:
- 175の海を終わらせる出口氷河の終端位置の動向の分析.
- 東南極の氷床の5,400km以上の氷河の変化をマッピングする.
- 氷河の動向と気温,海氷,南環状のデータとの相関.
主要な成果:
- 175の氷河で広範かつ同期的な終点変化が観察されました.
- 63%は1974年から1990年まで後退した; 72%は1990年から2000年まで進んだ; 58%は2000年から2010年まで進んだ.
- 太平洋沿岸の氷河は,ロス海氷河とは異なり,気温と海氷に関連した顕著な変化を示した.
結論:
- 東南極の氷河は,後退と前進の時代的なパターンを示しています.
- 太平洋沿岸の氷河の動態は,気候の変動,特に南方年表の変動に敏感です.
- 東南極の氷床の一部は,これまで認識されていたよりも,外部の強制力に対して脆弱である可能性があります.
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