INCORPORATING SEASONAL VARIATIONS OF GLOBAL AND
REGIONAL TRF SOLUTIONS BASED ON GRACE MEASUREMENTS
1）Institute of Geophysics & Geomatics，China University of Geosciences，Wuhan 430074
2）Hubei Subsurface Multiscale Imaging Lab（SMIL），China University of Geosciences（Wuhan），Wuhan 430074）
3）Institute of Seismology，China Earthquake Administration，Wuhan 430071
4）National Geomatics Center of China，Beijing 100044
Abstract：In this study，a seasonal loading model was imported into the ITRF2008 solutions based on GRACE（Gravity Recovery And Climate Environment）measurements to simulate hydrological loading，and comparison of the model to the original ITRF2008 for global reference frame realization was made.The seasonal components were simulated using either annual and semiannual terms or a nonparametric approach.Misfitting of the WRMS（Weighted Root Mean Squares）after 7parameter transformation calculated with the model decreases compared to that with the original ITRF2008 for more than 80% of daily GPS solutions.In general，the range of seasonal variations of daily solution at all sites is slightly larger in use of the seasonally augmented ITRF model.However，the results calculated with the model are more consistent with observed seasonal variations for 84% of the GPS sites.The findings mean that the use of the range of seasonal variations in the coordinate time series is decreased in use of ITRF2008 without seasonal terms relative to the true loading deformation，and that the results calculated with the TRF model included seasonal variations are more consistent with the observed GPS time series.
Zou Rong,Ding Kaihua,Yang Shaomin et al. INCORPORATING SEASONAL VARIATIONS OF GLOBAL AND
REGIONAL TRF SOLUTIONS BASED ON GRACE MEASUREMENTS[J]. jgg, 2014, 34(6): 50-54.
