熱帯太平洋上での長期平均垂直運動: 風のプロファイリングドップラーレーダー測定
まとめ
熱帯大気の垂直運動は,上層熱帯圏と下層平流圏において,下から上へと移行する. トロポパウズ付近のサールス雲は,これらの運動に大きく影響し,熱層圏と平層圏の質量交換に影響を与えます.
科学分野:
- 大気科学 大気科学
- トロピカル気象学 トロピカル気象学
- 大気ダイナミクス 大気ダイナミクス
背景:
- 熱帯の大気中の垂直運動は,気象パターンと気候にとって極めて重要です.
- トロポスフィアの循環とストラトスフィアの循環の間の移行を理解することは,気候モデリングの鍵です.
- 以前の研究は,特定の状態に焦点を当て,より広範な観察を必要とした.
研究 の 目的:
- 熱帯大気中の長期平均垂直運動を調査する.
- エルニーニョやシラス雲を含む大気条件が垂直運動に及ぼす影響を分析する.
- トロポスフィアとストラトスフィアの質量交換への影響を評価する.
主な方法:
- クリスマス島での測定のために,非常に高い周波数 (VHF) の風プロファイリングドップラーレーダーを使用しました.
- 長期平均垂直運動データを分析した.
- エルニーニョとエルニーニョ以外の期間における観測を,ポーンペイのデータと比較した.
主要な成果:
- 自由なトロポスフィアの下向き運動から上層トロポスフィアと下層ストラトスフィアの上向き運動への移行を観察した.
- 自由なトロポスフィアの動きは,澄んだ空気中のアディアバティックとダイアバティックの加熱/冷却バランスと一致します.
- トロポパウズ付近のサールス雲は,垂直運動の特徴を決定する上で重要な存在である.
結論:
- 熱帯の大気中の垂直運動パターンは,明確な垂直移行を示しています.
- サールス雲は,熱帯圏の垂直大気運動を調節する上で重要な役割を果たします.
- この発見は,大気圏と平流圏の間の大気質の交換を理解するために重要な意味を持つ.
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