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気候の移行における大気中の酸化物質の複数のコントロールの同位体証拠
Lei Geng1,2,3, Lee T Murray4, Loretta J Mickley5
1Department of Atmospheric Sciences, University of Washington, Seattle, Washington 98195, USA.
Nature
|May 18, 2017
まとめ
オゾン (O3) やヒドロキシル (HOx) のような熱帯酸化物質は,大気化学にとって極めて重要です. この研究では,以前の仮定に反して,O3/HOx比が冷たい気候で増加し,新しい気候フィードバックメカニズムを示唆しています.
科学分野:
- 大気化学と古気象学
- トロポスフィアの酸化物質と気候変動への反応の研究
背景:
- トロポスフィアの酸化物質 (オゾン,ヒドロキシル,ペロキシラジカル) は,微量ガス寿命と微粒子の形成を制御する.
- 現在の理解では,HOxが比較的安定した寒い気候でのオゾン減少が示唆されています.
- 過去の酸化レベルを制限するパレオ記録が不足しています.
研究 の 目的:
- 氷の核の記録を用いて 過去の熱帯酸化物質の行動を調査する.
- 過去の気候変化に対する大気中の酸化物質の反応を抑制する.
- 酸化物質化学に関連する潜在的気候フィードバックメカニズムを特定する.
主な方法:
- グリーンランドの氷の核からの窒素-17過剰の分析.
- 最後の氷河期と氷河期間の間のオゾン/HOx比の再構築とダンズガード・オシュガー現象.
- 過去の大気中の酸化物質の量で 氷の核データを利用した.
主要な成果:
- 寒い気候の時期にオゾン/HOx比の上昇が観察されました.
- この発見は 寒い気候でのオゾン濃度の低下に関する 既存の仮説と矛盾しています
- 証拠は,冷たい気候でオゾンと反応性ハロゲン化学の高層圏から熱帯圏への輸送が強化されていることを示唆しています.
結論:
- トロポスフィアの酸化物質は気候変化に敏感で,現在のモデルと比較して冷たい気候で反転する.
- ストラトスフィアのオゾン輸送とハロゲン化学が 推論された要因です
- これらのプロセスは 十分に研究されていない 重要な気候フィードバックメカニズムを表すかもしれません
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