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@ARTICLE{Post:829874,
author = {Post, Hanna and Vrugt, Jasper A. and Fox, Andrew and
Vereecken, Harry and Hendricks Franssen, Harrie-Jan},
title = {{E}stimation of {C}ommunity {L}and {M}odel parameters for
an improved assessment of net carbon fluxes at {E}uropean
sites},
journal = {Journal of geophysical research / Biogeosciences},
volume = {122},
number = {3},
issn = {2169-8953},
address = {[Washington, DC]},
reportid = {FZJ-2017-03490},
pages = {661 - 689},
year = {2017},
abstract = {The Community Land Model (CLM) contains many parameters
whose values are uncertain and thus require careful
estimation for model application at individual sites. Here
we used Bayesian inference with the DiffeRential Evolution
Adaptive Metropolis (DREAM(zs)) algorithm to estimate eight
CLM v.4.5 ecosystem parameters using 1 year records of
half-hourly net ecosystem CO2 exchange (NEE) observations of
four central European sites with different plant functional
types (PFTs). The posterior CLM parameter distributions of
each site were estimated per individual season and on a
yearly basis. These estimates were then evaluated using NEE
data from an independent evaluation period and data from
“nearby” FLUXNET sites at ~600 km distance to the
original sites. Latent variables (multipliers) were used to
treat explicitly uncertainty in the initial carbon-nitrogen
pools. The posterior parameter estimates were superior to
their default values in their ability to track and explain
the measured NEE data of each site. The seasonal parameter
values reduced with more than $50\%$ (averaged over all
sites) the bias in the simulated NEE values. The most
consistent performance of CLM during the evaluation period
was found for the posterior parameter values of the forest
PFTs, and contrary to the C3-grass and C3-crop sites, the
latent variables of the initial pools further enhanced the
quality-of-fit. The carbon sink function of the forest PFTs
significantly increased with the posterior parameter
estimates. We thus conclude that land surface model
predictions of carbon stocks and fluxes require careful
consideration of uncertain ecological parameters and initial
states.},
cin = {IBG-3 / JARA-HPC},
ddc = {550},
cid = {I:(DE-Juel1)IBG-3-20101118 / $I:(DE-82)080012_20140620$},
pnm = {255 - Terrestrial Systems: From Observation to Prediction
(POF3-255) / Better predictions with environmental
simulation models: optimally integrating new data sources
$(jicg41_20100501)$},
pid = {G:(DE-HGF)POF3-255 / $G:(DE-Juel1)jicg41_20100501$},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000398923300014},
doi = {10.1002/2015JG003297},
url = {https://juser.fz-juelich.de/record/829874},
}