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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.