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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/hessd-12-9393-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
17 Sep 2015
Review status
This discussion paper has been under review for the journal Hydrology and Earth System Sciences (HESS). The manuscript was not accepted for further review after discussion.
Simulating hydrology with an isotopic land surface model in western Siberia: what do we learn from water isotopes?
F. Guglielmo1, C. Risi2, C. Ottlé1, V. Valdayskikh3, T. Radchenko3, O. Nekrasova3, O. Cattani1, O. Stukova3, J. Jouzel1, V. Zakharov3, S. Dantec-Nédélec1, and J. Ogée4 1Laboratoire des Sciences du Climat, Institut Pierre-Simon Laplace, CEA-CNRS-UVSQ, Gif-sur-Yvette, France
2Laboratoire de Météorologie Dynamique, Institut Pierre-Simon Laplace, Paris, France
3Ural Federal University, Yekaterinburg, Russian Federation
4INRA, UMR 1391 ISPA, 33140 Villenave d'Ornon, France
Abstract. Improvements in the evaluation of land surface models would translate into more reliable predictions of future climate changes, as significant uncertainties persist in the quantification and representation of the relative contributions of soil and vegetation to the water and energy cycles. In this paper, we investigate the usefulness of water stable isotopes in land surface models studying land surface processes. To achieve this, we implemented 18O and 2H and the computation of the oxygen (δ18O) and deuterium (δD) stable isotope composition of soil and leaf water pools in a~recent version of the land surface model ORCHIDEE. We performed point-wise simulations with this new model and evaluated its performance on vertical profiles of soil water isotope ratios measured in summer 2012 at four experimental sites located in a boreal region of the Artic zone of western Siberia. The model performed relatively well in simulating some features of the δ18O soil profiles, but poorly reproduced the d-excess profiles, at all four stations.

The response of the simulated δ18O profiles to variations in key hydrological parameters revealed the importance of the choice of a correct infiltration pathway in ORCHIDEE. Our results show also that the strength of the evaporative enrichment signal plays a role in shaping the profiles, too and, therefore, the relevance of the vegetation and bare soil characterization. We investigated furthermore to which extent we are able to determine the relative contribution of the evaporation to the evapotranspiration.

This study's results confirm that the use of water stable isotopes measurements helps constrain the representation of key land surface processes in land surface models.


Citation: Guglielmo, F., Risi, C., Ottlé, C., Valdayskikh, V., Radchenko, T., Nekrasova, O., Cattani, O., Stukova, O., Jouzel, J., Zakharov, V., Dantec-Nédélec, S., and Ogée, J.: Simulating hydrology with an isotopic land surface model in western Siberia: what do we learn from water isotopes?, Hydrol. Earth Syst. Sci. Discuss., 12, 9393-9436, https://doi.org/10.5194/hessd-12-9393-2015, 2015.
F. Guglielmo et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC C3927: 'reviewer comment', Anonymous Referee #1, 29 Sep 2015 Printer-friendly Version 
 
RC C4189: 'Review', Anonymous Referee #2, 10 Oct 2015 Printer-friendly Version 
 
AC C6269: 'Response to the reviewers', Francesca Guglielmo, 22 Jan 2016 Printer-friendly Version Supplement 
F. Guglielmo et al.
F. Guglielmo et al.

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Short summary
We show that water stable isotopes help constraining key processes in the land surface model ORCHIDEE. We implemented 18O, 2H, δ18O and δD in soil and leaf water in the model, ran it and evaluated results on measured profiles of soil water isotopes ratios. Relevant features of δ18O profiles are relatively well simulated. We show the importance of infiltration pathway and vegetation/bare-soil cover in ORCHIDEE and to which extent we can determine the evaporation/evapotranspiration ratio.
We show that water stable isotopes help constraining key processes in the land surface model...
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