Independent Component Analysis of Water Storage Changes Interpretation over Tibetan Plateau and Its Surrounding Areas

We first use the independent component analysis (ICA) method to decompose the water storage changes derived from 132 months (2003-01—2013-12) gravity recovery and climate experiment (GRACE) measurements, and then compare the results with those from NOAH and WGHM hydrological models. The comparison results of components show that the first principal components from the water storage changes and hydrological models agree well, and the correlation coefficients are 0.884 and 0.877 respectively. It shows that GRACE derived water storage changes and hydrological models over Tibetan Plateau and its surrounding areas have a strong consistency. For spatial pattern, the amplitudes of GRACE-derived water storage changes are larger than that of hydrological models, which may be caused by the groundwater changes included in the GRACE-derived water storage changes