Hydrology and Earth System Sciences
Hydrology and Earth System Sciences
HESS
Articles | Volume 28, issue 1
Articles | Volume 28, issue 1
https://doi.org/10.5194/hess-28-229-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-28-229-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 28, issue 1
Technical note
 | 
16 Jan 2024
Technical note |  | 16 Jan 2024

Technical note: Isotopic fractionation of evaporating waters: effect of sub-daily atmospheric variations and eventual depletion of heavy isotopes

Francesc Gallart, Sebastián González-Fuentes, and Pilar Llorens

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Cited articles

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Allen, S. T., Keim, R. F., Barnard, H. R., McDonnell, J. J., and Brooks, J. R.: The role of stable isotopes in understanding rainfall interception processes: a review, WIREs Water, 4, e1187, https://doi.org/10.1002/wat2.1187, 2017. 
Allison, G. B. and Leaney, F. W.: Estimation of isotopic exchange parameters using constant-feed pans, J. Hydrol., 55, 151–161, https://doi.org/10.1002/wat2.1187, 1982. 
Benettin, P., Volkmann, T. H., von Freyberg, J., Frentress, J., Penna, D., Dawson, T. E., and Kirchner, J. W.: Effects of climatic seasonality on the isotopic composition of evaporating soil waters, Hydrol. Earth Syst. Sci., 22, 2881–2890, https://doi.org/10.5194/hess-22-2881-2018, 2018. 
Bonada, N., Cañedo-Argüelles, M., Gallart, F., von Schiller, D., Fortuño, P., Latron, J., Llorens, P., Múrria, C., Soria, M., and Vinyoles, D.: Conservation and Management of Isolated Pools in Temporary Rivers, Water, 12, 2870, https://doi.org/10.3390/w12102870, 2020.  
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Normally, lighter oxygen and hydrogen isotopes are preferably evaporated from a water body, which becomes enriched in heavy isotopes. However, we observed that, in a water body subject to prolonged evaporation, some periods of heavy isotope depletion instead of enrichment happened. Furthermore, the usual models that describe the isotopy of evaporating waters may be in error if the atmospheric conditions of temperature and relative humidity are time-averaged instead of evaporation flux-weighted.
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