jgg     2014 34 (6):  50-54    ISSN: 0412-1961  CN: 21-1139/TG 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 Multiscale 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 Received: 2014-06-20  Revised: null  Online: 2014-12-09 Supporting info