グリーンランドの低浸透性の氷板の急速な膨張
M MacFerrin1, H Machguth2,3, D van As4
1Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA. michael.macferrin@colorado.edu.
Nature
|September 20, 2019
まとめ
グリーンランド
科学分野:
- 氷河学
- 気候科学
- 水学
背景:
- グリーンランドの氷床の質量減少の主な要因です 氷床の質量減少の主な要因です
- グリーンランドの内部の多孔な雪やシワは 溶けた水を吸収できますが 再凍結は この緩衝効果を制限します
- グリーンランドの排水量に対する再凍結の影響は 大きく計測されていない.
研究 の 目的:
- グリーンランドの氷床から流れ出る溶融水の再凍結の影響を調査する.
- 融水による氷の形成と膨張を定量化するために
- 氷床が世界の海面上昇に 与える影響を予測する
主な方法:
- 原子核の分析とレーダー観測
- 地域気候モデルを利用する
- 流出面積と溶融水の貢献度の変化を定量化する.
主要な成果:
- 溶けた水の増加により 厚くて 透かしが低い氷の塊が形成されました
- グリーンランドの氷床の総流出面積は2001年以来26%±3%拡大した.
- グリーンランドの海面上昇への貢献は 2100年までに大幅に増加すると予測されています
結論:
- 氷板の形成は グリーンランドの水文学において,これまで定量化されていない重要な要因です.
- 気候の温暖化により 氷床がさらに内陸に広がるでしょう
- 氷床は溶けた水のフィードバックプロセスを大幅に強化し 氷床の振る舞いを変化させ 海面上昇を加速します
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