降水による大気中の分散の衛星推定値
Olivier Pauluis1, Juliana Dias
1Courant Institute of Mathematical Sciences, New York University, 251 Mercer Street, New York, NY 10012, USA. pauluis@cims.nyu.edu
Science (New York, N.Y.)
|February 25, 2012
まとめ
降水による摩擦の消去は,大気の運動エネルギーに大きく影響する. 衛星データによると,この分散は,水力学的変化と大気のエネルギー動態を結びつける,乱流の分散に匹敵する.
科学分野:
- 大気科学 大気科学
- 気候のダイナミクス
- 水文学 水文学とは
背景:
- 降水を取り巻く大気中の微物理的剪定地帯における摩擦的消散は,重要なエネルギーシンクである.
- この分散を理解することは,正確な気候モデリングとエネルギー予算の評価に不可欠です.
研究 の 目的:
- 降水によって誘発される大気摩擦分散の速度と地理的分布を定量化するために.
- 降雨誘発の消散を,渦巻運動エネルギー消散と比較するために.
- 大気中のエネルギー生成と消耗に,水循環の変化が与える潜在的な影響を評価する.
主な方法:
- 熱帯雨量測定ミッション (TRMM) の衛星データを取得した.
- 降雨量減少に関連した微物理的切断地帯における計算された分散率.
- 30°Sと30°Nの間の分散の地理的分布を分析した.
主要な成果:
- 30°Sから30°Nの間には,平方メートルあたり1.8ワットの平均消耗率が見られました.
- 降水によって引き起こされる消去は,降水パターンに密接に従います.
- 大陸のコンベクションは,海洋のコンベクションよりも強い分散率を示した.
結論:
- 降雨による消散は大気運動エネルギー予算の重要な構成要素であり,渦巻による消散に匹敵する.
- 水循環の変化は,大気運動エネルギーの生成と消去に直接影響を与える可能性があります.
- これは,降水プロセスと地球規模の大気循環の動態の間の重要なリンクを強調しています.
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