Articles | Volume 25, issue 3
https://doi.org/10.5194/acp-25-1965-2025
https://doi.org/10.5194/acp-25-1965-2025
Research article
 | 
14 Feb 2025
Research article |  | 14 Feb 2025

Diurnal, seasonal, and interannual variations in δ(18O) of atmospheric O2 and its application to evaluate natural and anthropogenic changes in oxygen, carbon, and water cycles

Shigeyuki Ishidoya, Satoshi Sugawara, and Atsushi Okazaki

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Short summary
The 18O/16O ratio of atmospheric oxygen, δatm(18O), is higher than that of ocean water due to isotopic effects during biospheric activities. This is known as the Dole–Morita effect, and its millennial-scale variations are recorded in ice cores. However, small variations of δatm(18O) in the present day have never been detected so far. This paper presents the first observations of diurnal, seasonal, and secular variations in δatm(18O) and applies them to evaluate oxygen, carbon, and water cycles.
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