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@ARTICLE{Rothfuss:22331,
author = {Rothfuss, Y. and Braud, I. and Le Moine, N. and Biron, P.
and Durand, J.L. and Vauclin, M. and Bariac, T.},
title = {{F}actors controlling the isotopic partitioning between
soil evaporation and plant transpiration: {A}ssessment using
a multi-objective calibration of {S}i{SPAT}-{I}sotope under
controlled conditions},
journal = {Journal of hydrology},
volume = {442-443},
issn = {0022-1694},
address = {Amsterdam [u.a.]},
publisher = {Elsevier},
reportid = {PreJuSER-22331},
pages = {75 - 88},
year = {2012},
note = {We thank the PNRH Thematic Action of the French ECCO
(ECosphere COntinentale) program for providing part of the
financial support of the study. We thank Ludovic Oudin (UMR
Sisyphe) for his helpful commentaries all along the writing
of the manuscript.},
abstract = {Stable isotopes of water (O-18 and H-2) are tracers of
ecosystem processes and in particular of water vapour
sources. They have been substantially used for
evapotranspiration (ET) studies. Data gathered during a
series of soil monoliths experiments under fully controlled
conditions allowed the partitioning of ET fluxes into soil
evaporation (Ev) and plant transpiration (Tr) from isotopic
measurements along growth of a tall fescue cover. These data
were used to calibrate SiSPAT-Isotope, a 1D
Soil-Vegetation-Atmosphere Transfer (SVAT) model coupled
with a module for isotopic transport in the soil and the
atmosphere. For this, the soil isotopic module was extended
to take into account plant water uptake by roots and the
model was modified so that it could be constrained with
collected input data (e.g. ET flux). The multi-objective
calibration method allowed determining narrowed probability
distributions for soil, plant and isotopic parameters of
which some are currently debated and/or typically not
measured in the field (e.g. kinetic fractionation factor
during soil evaporation). Comparisons between simulation
results corresponding to the "best compromise" parameter set
with data (i.e. soil water pressure and contents, soil
temperatures and heat fluxes, soil isotopic compositions,
and root extraction depths) were provided to show the
consistency of the calibration method. Guidelines were
provided for the determination of the isotopic composition
of evaporation in the field: we could emphasize the
importance of values used for the kinetic fractionation
factor and the impact of the heights at which atmospheric
variables (air relative humidity and temperature, isotopic
composition of atmospheric water vapour) are measured in the
field. (C) 2012 Elsevier B.V. All rights reserved.},
keywords = {J (WoSType)},
cin = {IBG-3},
ddc = {690},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {Terrestrische Umwelt},
pid = {G:(DE-Juel1)FUEK407},
shelfmark = {Engineering, Civil / Geosciences, Multidisciplinary / Water
Resources},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000305200700008},
doi = {10.1016/j.jhydrol.2012.03.041},
url = {https://juser.fz-juelich.de/record/22331},
}