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

Ishidoya, Shigeyuki; Sugawara, Satoshi; Okazaki, Atsushi

doi:https://doi.org/10.5194/acp-25-1965-2025

Articles | Volume 25, issue 3

https://doi.org/10.5194/acp-25-1965-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-25-1965-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 25, issue 3

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

Data sets

Dataset for ``Diurnal, seasonal, and interannual variations in $\delta$(${}^{18}$O) of atmospheric O$_2$ and its application to evaluate natural/anthropogenic changes in oxygen, carbon, and water cycles'' by Ishidoya et al. S. Ishidoya https://doi.org/10.5281/zenodo.14221768

Short summary

The ¹⁸O/¹⁶O ratio of atmospheric oxygen, δ_atm(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 δ_atm(¹⁸O) in the present day have never been detected so far. This paper presents the first observations of diurnal, seasonal, and secular variations in δ_atm(¹⁸O) and applies them to evaluate oxygen, carbon, and water cycles.