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Updated: Nov 26, 2025

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Evolution of Staircase Structures in Diffusive Convection
Published on: September 5, 2018
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インド の モンスーン が 北 大西洋 の 波動 列 に よっ て 脱線 し た
P J Borah1,2, V Venugopal3,2,4, J Sukhatme1,2
1Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore 560012, India.
まとめ
インドのモンスーンの干ばつは 太平洋の暖かい気候によって予測されます しかし,過去の干ばつの約半分は,太平洋のほぼ中性的な温度と,中緯度のロスビー波に関連した,シーズンの終わりに突然の降雨減少を示しています.
科学分野:
- 気候学
- 大気科学
- 気象学
背景:
- インドのモンスーンの干ばつ予測は,伝統的に暖かい赤道太平洋と結びついた季節間の降雨不足に依存しています.
- しかし,このパラダイムは,歴史的な干ばつイベントの重要な部分を占めていません.
研究 の 目的:
- 伝統的な温暖な太平洋のパラダイムから逸脱するインドのモンスーン干ばつの特徴と根本的なメカニズムを調査する.
- 干ばつ予測の改善のための代替予測要因を特定する.
主な方法:
- 過去100年の干ばつデータ分析
- 季節間の降雨パターンの特定と,太平洋と大西洋の気候の変動との相関.
- 大気圏のテレコネクション,特にロスビー波動と渦の異常を調査する.
主要な成果:
- 過去100年間に観測されたインドモンスーンの干ばつの約半分は,太平洋のほぼ中性的な温度で発生しました.
- これらの干ばつには 季節の終わりに突然の降雨不足が特徴でした
- 特に北大西洋の渦の異常に結びついた,中緯度から発生するロスビー波を含む,重要な大気遠隔接続が特定されました.
結論:
- インドのモンスーンの干ばつが,赤道太平洋の条件とは独立したメカニズムによって引き起こされる.
- 中緯度の大気圏のテレコネクションに関連した 季節外降雨の不足は 干ばつを誘発する 重要な要因ですが あまり評価されていません
- この特定された大気圏の遠隔接続は,特に太平洋の信号が欠けるとき,インドのモンスーンの干ばつを予測する新しい経路を提供します.
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