ストラトスフィアの二酸化窒素がソフリエール,セント・ヴィンセントの周辺で発生した
まとめ
上層大気中の二酸化窒素の測定は,Soufriere火山の近くで25%の上昇を示した. この増加は,通常の平流層の変動または火山の影響の上限を表す可能性があります.
科学分野:
- 大気化学 大気化学
- 火山学 火山学とは
- リモートセンシングによる遠隔感知
背景:
- 大気組成に対する火山噴火の影響を理解することは極めて重要です.
- 二酸化窒素 (NO2) は,平流層化学において重要な役割を果たしています.
- 以前の平流層のNO2の測定は,赤道地域のために存在していました.
研究 の 目的:
- ソフリエール火山の近くにある上層大気中の二酸化窒素 (NO2) の濃度を測定するために.
- ストラトスフィアのNO2の潜在的な火山による増強を評価する.
- NO2の豊富さに対する火山の影響の上限を決定するために.
主な方法:
- 大気測定のために夕暮れ光学吸収技術を活用した.
- 1979年4月にソフリエール火山の近くで測定を行った.
- 計算された二酸化窒素の柱密度.
主要な成果:
- 平方センチメートルあたり5×10^15分子の二酸化窒素柱密度が得られました.
- この値は,類似の緯度地域における以前に測定された豊富な量と比較して25%の改善を示しています.
- 観測された強化は,火山によるNO2への影響の上限を示しています.
結論:
- ソフリエール火山の近くで測定された平流層の二酸化窒素の上昇は,自然平流層の変動に起因する可能性があります.
- この発見は,火山が大気中のNO2総量に及ぼす影響の上限を定めています.
- さらなる研究は,NO2の変動性の火山と自然の源を区別することができます.
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