Abstract:We use 5 sets of GRACE data to invert the trend rates of terrestrial water storage change (TWSC) in the Tibetan plateau and adjacent areas, together with 4 types of de-striping filters and 2 types of smoothing filtersto show the variability of the results. S&W (P2M8) method with the varied-width sliding windows de-stripes more effectively, and the inverted lake water and glacier ice signals show a good consistency in the signal positions with those observed by ICESat-1 satellite altimetry. For Gaussian filter and Fan filter, the magnitudes of the main signals differ by 10-30%. Smoothing filtering usually lowers the magnitudes of the signals and reduces the spatial resolution. Even some signals of lake water and glacier ice are found to disappear. The results inverted by CSR/GFZ/JPL gravity data are close to each other and the CSR results are least impacted by the strips. The two JPL mass models MAS/MAS_S also show similar results, with the exception of a big difference in the western Plateau. Great differences are found between the results inverted from three gravity models that are calculated from two mass models. The S&W (P2M8) de-striping filter and the GRACE gravity model CSR is suggested for monitoring TWSC in the study areas.
XIANG Longwei,WANG Hansheng,JIA Lulu. The Variability of Terrestrial Water Storage Changes in the Tibetan Plateau and Adjacent Areas Retrieved by GRACE Data[J]. jgg, 2017, 37(3): 311-318.