極地メソスフィアの雲の隕石鉄の除去
John M C Plane1, Benjamin J Murray, Xinzhao Chu
1School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK. j.plane@uea.ac.uk
まとめ
極地メソスフィアの雲は,大気から鉄原子を効率的に除去します. 南極でライダーで観測されたこの相互作用は,雲の氷粒子の鉄吸収によって引き起こされる.
科学分野:
- 大気科学 大気科学
- エアロノミーはエアロノミーです.
- クラウド物理学 クラウド物理
背景:
- 極地メソスフィアの雲 (PMCs) は,高層メソスフィアの氷粒子の層です.
- これらの雲は,大気中の鉄 (Fe) 層の高さ近くで形成されます.
- 隕石の消去は,大気中のFeの主な源である.
研究 の 目的:
- 極地メソスフィアの雲と大気中の鉄原子の相互作用を調査する.
- PMCの存在下でのFe除去に起因するメカニズムを決定する.
主な方法:
- 南極におけるPMCとFe層のライダー観測.
- Fe-ice粒子相互作用をシミュレートする実験室での実験.
- 観測および実験データを解釈するための大気モデリング.
主要な成果:
- LIDARのデータは,PMCの高さにおけるFe原子のほぼ完全な除去を明らかにした.
- 実験室での研究では,氷の粒子の表面にFeの効率的な吸収が確認されました.
- モデリングは,除去メカニズムとしての表面堆積の仮説を裏付けました.
結論:
- 極地メソスフィアの雲は,大気中の鉄を収集する上で重要な役割を果たします.
- この相互作用は,氷の粒子へのFe吸収の物理化学によって支配されます.
- このプロセスは,上層大気圏の予算と金属の分布に影響を与えます.
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