1990年代初頭以来,アグルハス流の拡大ではなく強化
1Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida, USA.
Nature
|November 10, 2016
まとめ
アギルハス流は 気候変動により 予想どおりに激化していません 熱伝導と海洋の混合を 潜在的に変えてしまったのです
科学分野:
- 海洋学
- 気候科学
- 流体力学
背景:
- アグルハス流のような 西側の境界流は 地球の熱伝達と 気候の調節に不可欠です
- これらの電流は極に向かって移動し 気候変動により強まり 極端な天候に影響を与えると予測されています
- 観測データは,これらの流れの加速された温暖化を示し,増強のモデル予測を裏付けています.
研究 の 目的:
- アグラス流の強度と構造の 最近の変化を調査する
- アギュラス流が 気候変化による 理論的な予想に合致するかどうかを判断する
- 観測された変化が極側への熱伝達と海洋動力学に与える影響を評価する.
主な方法:
- 1990年代初頭からのアグルハス流の観測データ分析
- Agulhas Currentの傾向と気候モデル予測と線形動的理論の比較
- 渦の運動エネルギーと電流の拡大を変化の指標として検討する.
主要な成果:
- 1990年代初頭からアグルハス流は 予想に反して 激化していません
- 流れが広がり 渦巻き活動が増えたことが原因だ
- クロシオ流と東オーストラリア流の分析からも同様の傾向が見られる.
結論:
- 増強する風は,平均流ではなく,境界流の渦巻き運動エネルギーを増加させる可能性があります.
- 熱の輸送を減らし 横断的な海域の交換を 促進するかもしれません
- 変化する気候におけるこれらの流れの役割を理解するために,さらに in situ 測定が不可欠です.
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