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Updated: Jul 11, 2026

10:11
The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations
Published on: August 3, 2016
まとめ
大気中の酸素は,海洋水と比較して,1ミリあたり23.5の酸素-18濃度を示しています. 海水に溶けた酸素は0°Cでさらに0.85/mlの濃度で濃縮され,溶解性は温度に依存する.
科学分野:
- 地質化学 地質化学
- 海洋学 海洋学とは
- 大気科学 大気科学
背景:
- 大気中の酸素は,標準平均海洋水 (SMOW) に比べて安定した同位体酸素-18 (18O) の濃度が著しく増加している.
- 自然の水中の酸素同位体は,蒸発や降水などの物理的プロセス,大気と海洋の間のガス交換の影響を受けます.
研究 の 目的:
- 海洋水に対する大気中の酸素における酸素18の濃縮量を定量化するために.
- 0°Cで海水に溶けた酸素の同位素分子を測定する.
- 溶解した海水中の酸素-18濃縮の温度依存を確立するために.
主な方法:
- 大気中の酸素サンプルにおける酸素18/酸素16比の比較と標準平均海洋水 (SMOW) の比較.
- 制御された温度で大気中の酸素と均衡した海水サンプルにおける酸素18/酸素16比の測定.
- 同位体溶解性濃縮の温度依存性を決定するための数学的モデリング.
主要な成果:
- 大気中の酸素は,SMOWに比べて18Oで23.5 ± 0.3 per mil (‰) で濃縮されています.
- 海水に溶けた酸素は0°Cでさらに0.85 per mil (‰) に濃縮される.
- この溶解性濃縮の温度依存性は,次の方程式で記述されています: ε (‰) = 0.85 - 0.010 * t (°C).
結論:
- この研究は,大気中の酸素が18Oで濃縮されていることを確認した.
- 海水における酸素の溶解性は,温度に依存する追加の18O濃縮を導入する.
- これらの発見は,世界の酸素同位体予算とその温度に対する感度を理解するのに役立ちます.
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