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@ARTICLE{Quade:852670,
author = {Quade, Maria and Brüggemann, Nicolas and Graf, Alexander
and Vanderborght, Jan and Vereecken, Harry and Rothfuss,
Youri},
title = {{I}nvestigation of {K}inetic {I}sotopic {F}ractionation of
{W}ater {D}uring {B}are {S}oil {E}vaporation},
journal = {Water resources research},
volume = {54},
number = {9},
issn = {0043-1397},
address = {[New York]},
publisher = {Wiley},
reportid = {FZJ-2018-05543},
pages = {6909-6928},
year = {2018},
abstract = {The kinetic fractionation factor (αK) controls to a large
extent the isotopic enrichment of surface waters during
evaporation (E). In contrast to the well-known
vapor-to-liquid isotopic equilibrium fractionation factor,
αK has still not yet been properly characterized for soil
water evaporation. In this study, we investigated the αK
daily dynamics during a series of three laboratory
experiments differing in soil water availability and
aerodynamic conditions. For this, we applied a commonly-used
isotopic evaporation model and tested it in two different
approaches. First, a two-end member mixing model (“Keeling
plot”) was fitted to the measured isotopic composition of
the laboratory air water vapor to obtain αK. In a second
approach, αK was obtained from the slope of the
“evaporation line” in a dual isotopic coordinate system.
For both methods, the isotopic composition of the soil water
was determined non-destructively and online by sampling the
soil water vapor with gas-permeable microporous tubing.
Results highlighted the limitation of the first approach, as
the determination of the isotopic composition of E with the
Keeling plot was challenging with the laboratory setup. The
second approach provided αK values within the range
$(α_K^(2_H$ ) = 1.0132 ±0.0013; $α_K^(〖18〗_O$ ) =
1.0149 ±0.0012) reported in the literature and pointed to
the prevalence of turbulent water vapor transport under
water-saturated soil conditions, but also at soil water
content significantly lower than the saturated value. In a
third experiment, temporal dynamics of the atmospheric water
vapor intrusion in the topmost soil layer could be observed
during an isotopic labeling pulse.},
cin = {IBG-3},
ddc = {550},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {255 - Terrestrial Systems: From Observation to Prediction
(POF3-255) / IDAS-GHG - Instrumental and Data-driven
Approaches to Source-Partitioning of Greenhouse Gas Fluxes:
Comparison, Combination, Advancement (BMBF-01LN1313A)},
pid = {G:(DE-HGF)POF3-255 / G:(DE-Juel1)BMBF-01LN1313A},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000448088100059},
doi = {10.1029/2018WR023159},
url = {https://juser.fz-juelich.de/record/852670},
}