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@ARTICLE{Rains:841759,
author = {Rains, Dominik and Han, Xujun and Lievens, Hans and
Montzka, Carsten and Verhoest, Niko E. C.},
title = {{SMOS} brightness temperature assimilation into the
{C}ommunity {L}and {M}odel},
journal = {Hydrology and earth system sciences},
volume = {21},
number = {11},
issn = {1607-7938},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2018-00063},
pages = {5929 - 5951},
year = {2017},
abstract = {SMOS (Soil Moisture and Ocean Salinity mission) brightness
temperatures at a single incident angle are assimilated into
the Community Land Model (CLM) across Australia to improve
soil moisture simulations. Therefore, the data assimilation
system DasPy is coupled to the local ensemble transform
Kalman filter (LETKF) as well as to the Community Microwave
Emission Model (CMEM). Brightness temperature climatologies
are precomputed to enable the assimilation of brightness
temperature anomalies, making use of 6 years of SMOS data
(2010–2015). Mean correlation R with in situ measurements
increases moderately from 0.61 to 0.68 $(11 \%)$ for upper
soil layers if the root zone is included in the updates. A
reduced improvement of $5 \%$ is achieved if the
assimilation is restricted to the upper soil layers.
Root-zone simulations improve by $7 \%$ when updating both
the top layers and root zone, and by $4 \%$ when only
updating the top layers. Mean increments and increment
standard deviations are compared for the experiments. The
long-term assimilation impact is analysed by looking at a
set of quantiles computed for soil moisture at each grid
cell. Within hydrological monitoring systems, extreme dry or
wet conditions are often defined via their relative
occurrence, adding great importance to assimilation-induced
quantile changes. Although still being limited now, longer
L-band radiometer time series will become available and make
model output improved by assimilating such data that are
more usable for extreme event statistics.},
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:000416334700002},
doi = {10.5194/hess-21-5929-2017},
url = {https://juser.fz-juelich.de/record/841759},
}