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窒素同位素の組成とアーケアの大気の密度
Bernard Marty1, Laurent Zimmermann, Magali Pujol
1Centre de Recherches Pétrographiques et Géochimiques-CNRS, Université de Lorraine, 15 rue Notre Dame des Pauvres, 54501 Vandoeuvre-lès-Nancy Cedex, France. bmarty@crpg.cnrs-nancy.fr
まとめ
古代の大気分析は,以前考えられていたよりも低いN2部分圧力を明らかにしています. これは,二酸化炭素もおそらく低いので,二酸化窒素は地球の古代の熱予算の主要な要因ではなかったことを示唆しています.
科学分野:
- 地質化学 地質化学
- 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
- 大気科学 大気科学
背景:
- 古代の大気組成を理解することは,古代地球の状態を再構築するために不可欠です.
- 以前のモデルでは,このエオン間の大気ガスに関する正確な制約が欠けていました.
研究 の 目的:
- 古代の大気中の窒素の部分圧力と同位体組成を決定するために.
- 古代の熱予算における二酸化窒素と二酸化炭素の役割を評価する.
主な方法:
- 窒素とアルゴンの同位体の分析.
- 30~35億年前の水熱カルツ内の液体インクルージョンの調査.
主要な成果:
- 古代の大気中のN2の偏圧は1.1バー未満に制限され,潜在的に0.5バーまで低かった.
- 窒素同位体組成は,現在の値に類似していることが判明しました.
- 結果は,CO2のアーカイアン部分圧が低いことを示唆しており,おそらく0.7bar以下である.
結論:
- 二酸化窒素 (N2) は,初期の地球の熱調節において,小さな役割を果たした可能性が高い.
- アーケイアの大気には,いくつかのモデルが示唆するよりも低いN2部分圧と潜在的に低いCO2レベルがありました.
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