南アジアモンスーンの支配的な制御は,高原の加熱と対比して,オログラフィック・インソレーションによる
William R Boos1, Zhiming Kuang
1Department of Earth and Planetary Sciences.
Nature
|January 16, 2010
まとめ
チベット高原はチベット高原です.
科学分野:
- 気候学 気候学
- 大気科学 大気科学
- 地質物理学 地質物理学とは地質物理学です.
背景:
- チベット高地の高い高さは,伝統的に南アジアの夏季モンスーンの主要な原動力と考えられています.
- 以前の仮定は,高原の上昇を地質時間スケールの気候変動と結び付けていた.
- 現在の気象観測は,高原ではなくインド上部の熱帯圏のピークを示しており,その支配的な役割に疑問を投げかけています.
研究 の 目的:
- 南アジアの夏季モンスーンの熱源としてのチベット高原の実際の役割を調査する.
- モンスーンの動態に対する山脈,特にヒマラヤの影響を再評価する.
- 地域気候に対する陸地表面と放射線強制の影響を理解する.
主な方法:
- チベットの高原の熱力強制作用となくとも,ともなくとも,モンスーンの循環をシミュレートするために大気モデルを利用した.
- ヒマラヤと隣接する山脈の狭いオログラフィをモデル実験で保存した.
- 地域の気候対応を評価するために,観測データとモデルアウトプットを分析した.
主要な成果:
- チベットの高原の加熱効果を排除しても,南アジアの大規模な夏季季風の循環は大きく変化しなかった.
- 高原の加熱は,その南端に沿って地元の降雨を増加させることが判明しました.
- ヒマラヤ山脈と関連した山々は,寒い熱帯外の地域から暖かいインド空気を隔離することによって,モンスーンの維持に不可欠なようです.
結論:
- この研究は,南アジアの夏季モンスーンの支配的な原動力としてチベット高原の長年にわたる見解に異議を唱える.
- 山岳のオログラフィー,特にヒマラヤは,モンスーンの強度を形成する上で重要な役割を果たしています.
- この発見は,オーログラフィック上昇への過去の気候反応と将来の気候変動の影響の再解釈を必要としています.
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