Articles | Volume 24, issue 9
Hydrol. Earth Syst. Sci., 24, 4491–4501, 2020

Special issue: Water, isotope and solute fluxes in the soil–plant–atmosphere...

Hydrol. Earth Syst. Sci., 24, 4491–4501, 2020

Research article 16 Sep 2020

Research article | 16 Sep 2020

Novel Keeling-plot-based methods to estimate the isotopic composition of ambient water vapor

Yusen Yuan et al.

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Hydrol. Earth Syst. Sci. Discuss.,,, 2020
Revised manuscript not accepted

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Subject: Ecohydrology | Techniques and Approaches: Modelling approaches
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Cited articles

Aemisegger, F., Pfahl, S., Sodemann, H., Lehner, I., Seneviratne, S. I., and Wernli, H.: Deuterium excess as a proxy for continental moisture recycling and plant transpiration, Atmos. Chem. Phys., 14, 4029–4054,, 2014. 
Brunel, J. P., Walker, G. R., Dighton, J. C., and Monteny, B.: Use of stable isotopes of water to determine the origin of water used by the vegetation and to partition evapotranspiration. A case study from HAPEX-Sahel, J. Hydrol., 188–189, 466–481,, 1997. 
Chen, F. L., Zhang, M. J., Ma, Q., Wang, S. J., Li, X. F., and Zhu, X. F.: Stable isotopic characteristics of precipitation in Lanzhou city and its surrounding areas, Northwest China, Environ. Earth Sci., 73, 4671–4680,, 2015. 
Corneo, P. E., Kertesz, M. A., Bakhshandeh, S., Tahaei, H., Barbour, M. M., and Dijkstra, F. A.: Studying root water uptake of wheat genotypes in different soils using water δ18O stable isotopes, Agr. Ecosyst. Environ., 264, 119–129,, 2018. 
Craig, H. and Gordon, L. I.: Deuterium and oxygen 18 variations in the ocean and marine atmosphere, in: Stable Isotopes in Oceanographic Studies and Paleotemperatures, edited by: Tongiorgi, E., Consiglio nazionale delle richerche laboratorio di geologia nuclear, p. 9, 1965. 
Short summary
The isotopic composition of ambient water vapor is an important source of atmospheric water vapor and has not been able to be estimated to date using the Keeling plot approach. Here we proposed two new methods to estimate the isotopic composition of ambient water vapor: one using the intersection point method and another relying on the intermediate value theorem.