ウインドプロファイラーレーダーによる平流層オゾン侵入の検出
W K Hocking1, T Carey-Smith, D W Tarasick
1Department of Physics and Astronomy, University of Western Ontario, London, Ontario, N6A 3K7 Canada. whocking@uwo.ca
Nature
|November 13, 2007
まとめ
トロポスフィアのストラトスフィアのオゾン侵入は,風プロファイラーレーダーとオゾン探査データを用いて特定されました. トロポパウスの高さの急速な変化は,これらのイベントを効果的に診断し,地面レベルのオゾンに影響を及ぼします.
科学分野:
- 大気科学 大気科学
- 環境科学 環境科学
- オゾン層の研究 オゾン層の研究
背景:
- ストラトスフィアのオゾンは,紫外線から生物圏を保護し,トロポスフィアの化学に影響を与えます.
- 汚染物質である熱帯圏オゾンは,生態系と人間の健康を害し,温室効果ガスとして作用します.
- トロポスフィアのオゾン予算とトレンドにとってオゾンのストラトスフィア-トロポスフィア輸送は極めて重要ですが,侵入イベントは依然として十分に理解されていません.
研究 の 目的:
- 新しく開発されたリモートセンシング技術を用いて,熱帯圏への平流層オゾン侵入を調査する.
- ストラトスフィアからトロポスフィアへのオゾン輸送を予測するための信頼できる診断を特定する.
- トロポスフィアの化学と気候におけるオゾンの役割の理解を深めること.
主な方法:
- トロポパウスの高度を毎時間監視するために,近代的な風プロファイラーレーダーを使用しました.
- 詳細な大気分析のために,頻繁なオゾン波と気球打ち上げを組み合わせたレーダーデータ.
- 侵入イベント中にオゾン密度の変動性と分散パターンを分析した.
主要な成果:
- カナダ南東部上空の熱帯圏に,多数の平流層オゾン侵入を特定した.
- 観測されたオゾンは,数キロメートルにわたって分散し,または地面に達し,局所オゾンの濃度に大きな影響を与える.
- レーダーによるトロポパウスの高さの急速な変化が,これらの侵入イベントを先行し,診断することを発見しました.
結論:
- 風力プロファイラーのレーダーデータとオゾン探査の測定を組み合わせて,高層圏のオゾン侵入を効果的に追跡します.
- トロポパウスの高度の変化は,オゾン侵入のイベントに対する貴重な早期警告として機能します.
- ストラトスフィアのオゾンは,トロポスフィアのオゾンのレベルと変動に大きく影響し,ストラトスフィア-トロポスフィア輸送の重要性を強調しています.
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