Please insert Figure 5 here
Among the different land surface models offered by GLDAS mission, the
Catchment Land Surface Model (CLSM) is the only one that models
groundwater storage estimations. The modelled GWS estimations were
extracted from CLSM data model outputs and then the anomalies of the
storage were calculated based on the same baseline used for GRACE
dataset. Figure 6 illustrates the comparison of the GRACE GWSA and CLSM
GWSA estimations from 2003 to 2014 over Turkey. The modelled GWSA seems
not to be in harmony with the GRACE estimations. The Correlation
coefficient between GRACE and CLSM based GWSA was found to be 0.21. This
low agreement seen between satellite and modelled GWSA values results
from the uncertainties associated with the GLDAS estimations of
groundwater storage, which is a restricting aspect for the application
of these estimations.