Articles | Volume 21, issue 2
Atmos. Chem. Phys., 21, 1357–1373, 2021
https://doi.org/10.5194/acp-21-1357-2021
Atmos. Chem. Phys., 21, 1357–1373, 2021
https://doi.org/10.5194/acp-21-1357-2021
Research article
01 Feb 2021
Research article | 01 Feb 2021

Secular change in atmospheric Ar∕N2 and its implications for ocean heat uptake and Brewer–Dobson circulation

Shigeyuki Ishidoya et al.

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Cited articles

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Aoki, N., Ishidoya, S., Matsumoto, N., Watanabe, T., Shimosaka, T., and Murayama, S.: Preparation of primary standard mixtures for atmospheric oxygen measurements with less than 1 µmol mol−1 uncertainty for oxygen molar fractions, Atmos. Meas. Tech., 12, 2631–2646, https://doi.org/10.5194/amt-12-2631-2019, 2019. 
Aoki, N., Ishidoya, S., Tohjima, Y., Morimoto, S., Keeling, R. F., Cox, A., Takebayashi, S., and Murayama, S.: Inter-comparison of O2∕N2 Ratio Scales Among AIST, NIES, TU, and SIO Based on Round-Robin Using Gravimetric Standard Mixtures, Atmos. Meas. Tech. Discuss. [preprint], https://doi.org/10.5194/amt-2020-481, in review, 2021. 
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Short summary
The surface Ar / N2 ratio showed not only secular increasing trends, but also interannual variations in phase with the global ocean heat content (OHC). Sensitivity test by using a two-dimensional model indicated that the secular trend in the Ar / N2 ratio is modified by the gravitational separation in the stratosphere. The analytical results imply that the surface Ar/N2 ratio is an important tracer for detecting spatiotemporally integrated changes in OHC and stratospheric circulation.
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