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@ARTICLE{Keune:825896,
author = {Keune, Jessica and Gasper, Fabian and Goergen, Klaus and
Hense, Andreas and Shrestha, Prabhakar and Sulis, Mauro and
Kollet, Stefan},
title = {{S}tudying the influence of groundwater representations on
land surface-atmosphere feedbacks during the {E}uropean heat
wave in 2003},
journal = {Journal of geophysical research / Atmospheres},
volume = {121},
number = {22},
issn = {2169-897X},
address = {Hoboken, NJ},
publisher = {Wiley},
reportid = {FZJ-2017-00175},
pages = {13,301 - 13,325},
year = {2016},
abstract = {The impact of 3D groundwater dynamics as part of the
hydrologic cycle is rarely considered in regional climate
simulation experiments. However, there exists a spatial and
temporal connection between groundwater and soil moisture
near the land surface, which can influence the land
surface-atmosphere feedbacks during heat waves. This study
assesses the sensitivity of bedrock-to-atmosphere
simulations to groundwater representations at the
continental scale during the European heat wave 2003 using
an integrated fully coupled soil-vegetation-atmosphere
model. The analysis is based on the comparison of two
groundwater configurations: (1) 3D physics-based variably
saturated groundwater dynamics and (2) a 1D free drainage
(FD) approach. Furthermore, two different subsurface
hydrofacies distributions (HFD) account for the uncertainty
of the subsurface hydraulic characteristics, and ensemble
simulations address the uncertainty arising from different
surface-subsurface initial conditions. The results show that
the groundwater representation significantly impacts land
surface-atmosphere processes. Differences between the two
groundwater configurations follow subsurface patterns, and
the largest differences are observed for shallow water table
depths. While the physics-based setup is less sensitive to
the HFD, the parameterized FD simulations are highly
sensitive to the hydraulic characteristics of the
subsurface. An analysis of variance shows that both, the
groundwater configuration and the HFD, induce variability
across all compartments with decreasing impact from the
subsurface to the atmosphere, while the initial condition
has only a minor impact.},
cin = {IBG-3},
ddc = {550},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {255 - Terrestrial Systems: From Observation to Prediction
(POF3-255)},
pid = {G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000390607900007},
doi = {10.1002/2016JD025426},
url = {https://juser.fz-juelich.de/record/825896},
}