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熱帯インド洋の二極モードです
N H Saji1, B N Goswami, P N Vinayachandran
1Institute for Global Change Research, SEAVANS N 7F, 1-2-1 Shibaura, Minato-ku, Tokyo 105 6791, Japan.
Nature
|July 25, 2006
まとめ
科学者たちは,新しいインド洋の二極モードを発見し,気候の変動を駆動するユニークな空気と海の相互作用を発見しました. この発見は,東アフリカやインドネシアなどの地域における長期の降雨異常予測を改善する.
科学分野:
- 海洋学 海洋学 海洋学
- 気候学 気候学
- 気象学 気象学 気象学
背景:
- 気候の変動の内部モードは,太平洋と大西洋で認識されています.
- 年間間の気候変動の変動を誘発する同様の海洋大気相互作用は,以前インド洋で発見されていなかった.
研究 の 目的:
- インド洋の気候変動の内部モードを特定し,特徴づけること.
- 地域における年間間の気候変動の変動に起因する海と大気の相互作用を調査する.
主な方法:
- 過去40年間の観測データを分析した.
- 海面温度,風のパターン,降水異常の調査.
- 海面温度と風の間の時空間の関連性を評価し,海洋の動態と降雨を考慮する.
主要な成果:
- 内部変動のパターンであるインド洋二極 (IOD) モードの発見.
- IODは,スマトラ沖の異常な低海面温度と,インド洋西部の高海面温度を示しています.
- このモードは,エルニーニョ/南方振動から独立して,降水と海洋動態と結合し,インド洋の海面温度変動の12%を説明しています.
結論:
- 特定された二極モードは,インド洋の独特で固有の空気海相互作用プロセスです.
- アクティブなIODイベントは,東アフリカでの激しい降雨と,インドネシアでの干ばつと相関しています.
- この発見は,被災国における長期の降雨異常予測の見通しを高めています.
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