WHU-Grace01s:A new temporal gravity field model recovered from GRACE KBRR data alone

A new temporal gravity field model called WHU-GraceOls solely recovered from Gravity Recovery and Climate Experiment(GRACE)K-Band Range Rate(KBRR)data based on dynamic integral approach is presented in this paper.After meticulously preprocessing of the GRACE KBRR data,the root mean square of its post residuals is about 0.2 micrometers per second,and seventy-two monthly temporal solutions truncated to degree and order 60 are computed for the period from January 2003 to December 2008.After applying the combination filter in WHU-GraceOls,the global temporal signals show obvious periodical change rules in the large-scale river basins.In terms of the degree variance,our solution is smaller at high degrees,and shows a good consistency at the rest of degrees with the Release 05 models from Center for Space Research(CSR),GeoForschungsZentrum Potsdam(GFZ)and Jet Propulsion Laboratory(JPL).Compared with other published models in terms of equivalent water height distribution,our solution is consistent with those published by CSR,GFZ,JPL,Delft institute of Earth Observation and Space system(DEOS),Tongji University(Tongji),Institute of Theoretical Geodesy(ITG),Astronomical Institute in University of Bern(AIUB)and Groupe de Recherche de Geodesie Spatiale(GRGS),which indicates that the accuracy of WHU-GraceOls has a good consistency with the previously published GRACE solutions.