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南半球の異常気象に関連した南極沖のポリニア
Ethan C Campbell1, Earle A Wilson2, G W Kent Moore3,4
1School of Oceanography, University of Washington, Seattle, WA, USA. ethancc@uw.edu.
Nature
|June 12, 2019
まとめ
南極沖のポリニアは 激しい嵐と激しい熱損失により形成され 海洋層が弱まります これらの現象は 気候の変動によって引き起こされ 南洋の動態を理解するのに 極めて重要です
科学分野:
- 海洋学
- 気候科学
- 南極 研究
背景:
- 南極沖のポリニアは 冬の大きな海氷の開口です
- その形成は深海の熱換気と 流動的混合に結びついています
- ポリニア形成のメカニズムは,アビサルの特性への潜在的な影響にもかかわらず,まだ十分に理解されていません.
研究 の 目的:
- ウェッデル海域のポリニアの形成メカニズムを調査する
- ポリニアの発生における上海環境と気象現象の役割を特定する.
- ポリニアと南半球の気象変動の関係を理解する.
主な方法:
- 2016年と2017年の自律プロファイリングの浮動観測を利用した.
- 1976年以来モード・ライズ近くで観測された最大のポリニアのデータを分析した.
- 気象データと海洋学的な状況,層分化と上流を含む.
主要な成果:
- ポリニアの形成は激しい嵐によって開始され,調節された.
- 激しい熱の損失は ポリニアの内部に 深い転覆をもたらしました
- 記録的な風力による上昇は ハリネス層を弱め 安定性を損ねました
- 以前のウェッデルポリニアは 似たような異常な条件下で形成されたようです
結論:
- 南極のポリニアを駆動する.
- これらのポリニアは南半球の気候の変動と関連しています.
- この変動は人為的な気候変動により強化され,ポリンヤの頻度が潜在的に増加すると予測されています.
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