Assimilation of soil moisture in LPJ-DGVM
2009
Process-oriented dynamic vegetation models are effective tools to assess carbon and water exchanges between vegetation
and environment for different scales. Lund-Potsdam-Jena Dynamic Global Vegetation Model (LPJ-DGVM) is one of the
well-established, process-oriented dynamic vegetation models. It can simulate seasonal trends of EvapoTranspiration
(ET) and Net Ecosystem Exchange (NEE) forced by weather data. In this study, LPJ-DGVM was employed to simulate
the ET and NEE in Yingke (YK) oasis station and A'Rou (AR) freeze/thaw observation station. The results indicate that
LPJ-DGVM could not make good estimations in both YK station and AR station. The simulation results were validated
with the water and CO 2 flux observation from Eddy Covariance (EC). The freeze-thaw phenomenon and irrigation have
great impacts on soil water content dynamic in arid region, but they are not considered in LPJ-DGVM. In order to
improve the simulation accuracy, a soil water content data assimilation scheme was designed. The observed soil water
content was assimilated into LPJ-DGVM with Ensemble Kalman Filter (EnKF) algorithm. The simulation accuracy of
LPJ-DGVM was improved obviously when soil water content was assimilated into LPJ-DGVM. The EnKF is effective
for assimilating in situ observation.
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