GRACE监测青藏高原及邻区陆地水储量变化结果的可变性

结合4种不同的去相关滤波和2种平滑滤波，利用5组GRACE数据反演了青藏高原及邻区陆地水储量变化趋势，研究了结果的可变性。结果表明，采用S&W（P2M8）变宽度滑动窗口去条带效果较好，其结果中的湖水、冰川信号与卫星测高观测的信号位置具有较好的一致性。高斯滤波的异常幅值与扇形滤波相差10%~30%，平滑处理后异常幅值减少，观测分辨率降低，部分湖和冰川信号甚至消失。CSR/GFZ/JPL重力场模型反演的结果相近，但CSR去条带效果最好；JPL质量模型MAS/MAS_S的结果也相近，但在高原西部有较大差异。重力场模型与质量模型的结果相差很大。在利用GRACE卫星监测本地区陆地水储量变化时，推荐使用S&W（P2M8）去条带滤波器、CSR重力场模型数据。

The Variability of Terrestrial Water Storage Changes in the Tibetan Plateau and Adjacent Areas Retrieved by GRACE Data

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.