春の南極極極域の極地渦におけるオゾン層の減少率の空間的変動
1Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena 91125, USA.
Science (New York, N.Y.)
|May 11, 1990
まとめ
エリアマッピング技術により,南極極の極地渦中に安定したコラー領域が発見され,オゾンレベルが変動しています. この研究では,オゾン層の破壊を理解するために不可欠なクロリン一酸化物濃度が推定されています.
科学分野:
- 大気化学 大気化学
- オゾン層のダイナミクス
- 極地気象学 極地気象学
背景:
- 南極極の極地渦は,オゾン分布に影響を与えるシナプティックな乱れを経験しています.
- オゾン (O3) の時間的な進化を理解することは,大気の変化を評価するための鍵です.
研究 の 目的:
- オゾン形状の詳細な分析のために,Nimbus-7 TOMSデータにエリアマッピング技術を適用する.
- 光化学モデルを使用して,南極の渦中の塩素一酸化物 (ClO) の濃度を制限する.
主な方法:
- Nimbus-7 トータルオゾンマッピングスペクトロメーター (TOMS) のデータに適用されたエリアマッピング技術.
- オゾン損失率を評価するために,簡素化された光化学モデルを使用した.
- エリアマッピングされた極地オゾンの一時的進化を分析した.
主要な成果:
- 南極極の極地渦中の変数内部を囲む安定したコラー領域を特定しました.
- コラー領域で暫定的な準周期的なオゾン変動 (15〜20日) を観測した.
- 塩素一酸化物 (ClO) の濃度は,改訂された値に匹敵し,春の初めに濃度が高くなる可能性があります.
結論:
- エリアマッピング技術は,渦の乱れを効果的にフィルタリングし,詳細なオゾン形態を明らかにします.
- 推定ClO濃度は,南極の春に顕著なオゾン層の減少メカニズムを示唆しています.
- 測定の不確実性のためにオゾン損失率とClO濃度を精錬するためにさらなる研究が必要である.
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