Articles | Volume 21, issue 2
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, Satoshi Sugawara, Yasunori Tohjima, Daisuke Goto, Kentaro Ishijima, Yosuke Niwa, Nobuyuki Aoki, and Shohei Murayama

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Cited articles

Adachi, Y., Kawamura, K., Armi, L., and Keeling, R. F.: Diffusive separation of the lower atmosphere, Science, 311, 1429 pp.,, 2006. 
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,, 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],, in review, 2021. 
Austin, J. and Li, F.: On the relationship between the strength of the Brewer-Dobson circulation and the age of stratospheric air, Geophys. Res. Lett., 33, L17807,, 2006. 
Banks, P. M. and Kockarts, G.: Aeronomy, Parts A and B, Academic Press, New York, USA, 1973. 
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.
Final-revised paper