まとめ
エルニーニョ現象はペルー沖の海流と気温を大幅に変化させます. ペルー沿岸の下流は加速し,エルニーニョの発生時に暖かい水を極方向に運び,ケルビン波の伝播を示唆しました.
科学分野:
- 海洋学 海洋学 海洋学
- 気候科学 気候科学
- マリン・バイオロジー マリン・バイオロジー
背景:
- エルニーニョの南方振動 (ENSO) は,世界の気候と海洋生態系に大きな影響を及ぼします.
- ENSOに対する地域海洋の反応を理解することは,生態学的および気候的な変化を予測するために極めて重要です.
研究 の 目的:
- エルニーニョの発生時にペルーの大陸棚の地下流と温度変化を調査する.
- エルニーニョの発生とペルー沿岸下流の行動との関係を決定する.
- エルニーニョの発生シグナルの伝播メカニズムを探求する.
主な方法:
- 地下流と気温の1年間のインシット測定.
- 1976年と1982年のエルニーニョ現象における海洋データの分析.
- 海平面の変化と,電流と気温のデータとの相関関係.
主要な成果:
- ペルー沿岸下流の速度は,エルニーニョの発生時に倍以上に増加した.
- 異常な温水は,加強された下流によって,極に向かって誘導された.
- 異なる季節に始まるエルニーニョ現象でも同様の電流と温度反応が観察されました.
- ガラパゴス諸島での海面上昇に続いて,極に向かっての流れの加速は,ケルビン波の伝播を示しています.
結論:
- エルニーニョの発生は,ペルー沿岸下流に重大な変化を引き起こします.
- 地下流は,エルニーニョの際に暖かい水の極方への誘導に重要な役割を果たします.
- ケルビン波は,エルニーニョの発生シグナルがペルーのシェルフに急速に伝播することを媒介する可能性がある.
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