オーログラフィによる北米モンスーンの機械的強制

William R Boos^1,2, Salvatore Pascale^3,4

¹Department of Earth and Planetary Science, University of California, Berkeley, CA, USA. billboos@alum.mit.edu.

Nature

|November 25, 2021

まとめ

北米のモンスーン

科学分野:

大気科学
気象学
気候の動態

背景:

北米のモンスーンはメキシコの西海岸に激しい降雨をもたらします.
その駆動メカニズムは,伝統的に熱力強引に起因するが,これは議論されている.

研究の目的:

北米のモンスーンを駆動する根本的なメカニズムを調査するために
モンスーンの発展における陸地と大気の相互作用と山脈の役割を決定する.

主な方法:

大気動力学と熱力学に関する観測データの分析.
グローバル気候モデルのシミュレーションを用いて
アディアバティック静止波の溶液を適用する

主要な成果:

シエラ・マドレ山脈は熱帯圏外のジェットストリームを機械的に赤道に押し寄せるのです
この相互作用により上昇の流れが生み出され,湿気が上昇し,コンベクティブの降雨が起こります
地表の熱流は,大気の予備条件付けで二次的な役割を果たします.

結論:

北米のモンスーンは主にコンベクティブにより強化されたオログラフィの降雨であり,典型的な熱的に強制された熱帯モンスーンではありません.
ジェットストリームとオーログラフィーの相互作用は,モンスーンのダイナミクスにとって極めて重要です.
これらのメカニズムの理解は気候変動に対するモンスーンの反応を予測するのに不可欠です

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