南極 の 氷棚 の 下 から 出る 溶けた 水 の 強い 横向 流出
Alberto C Naveira Garabato1, Alexander Forryan1, Pierre Dutrieux2,3
1Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, UK.
Nature
|January 31, 2017
まとめ
南極の氷の融水は 遠心分離の不安定により 深海に沈みます 海流によって引き起こされるこのプロセスは 気候モデルと南極の氷の融解の影響への理解に影響します
科学分野:
- 海洋学
- 氷河学
- 気候科学
背景:
- 南極の氷床の融解は 気候変動の主要な要因です
- 溶けた水の垂直分布は海面,海洋循環,生態系に大きな影響を及ぼします
- 現在の気候モデルでは,通常,地表付近の投入を想定して,融水深さを誤って表しています.
研究 の 目的:
- 南極の氷棚から排出される溶融水の深さを制御するメカニズムを特定する.
- 溶けた水の羽根の振る舞いにおける乱流の性質の役割を調査する.
- 南極の氷の融解をシミュレートする 気候モデルの精度を向上させるため
主な方法:
- 溶融水の流出の乱流の性質の現地観測
- 南極の氷棚の下の溶けた水の上昇と混合のダイナミクスの分析
- 理想化された海洋循環モデリングでメカニズムの適用性をテストする.
主要な成果:
- 溶けた水の流出は 離心器の転覆の不安定性を引き起こす
- この不安定さは 海洋の断層からエネルギーを抽出し 横向の輸出と混合を促進します
- 溶けた水は 表面の近くではなく 深い海面に蓄積されます
結論:
- 南極の氷の棚から 溶けた水の深層流出は 頑丈なメカニズムによって説明できます
- この過程は南極の様々な氷棚に 広く広がっています
- このメカニズムを 気候モデルに組み込むことは 予測の正確性にとって 極めて重要です
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