2022-08-16T05:08:20Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/447912021-11-01T07:42:01Zhdl_2115_20039hdl_2115_116Acceleration signal in GRACE time-variable gravity in relation to interannual hydrological changesOgawa, RyokoChao, Benjamin F.Heki, KosukeSatellite geodesyTime variable gravityGlobal change from geodesyHydrology450We use 6 yr of data of the GRACE (Gravity Recovery and Climate Experiment) satellite mission, which yield estimation for interannual signals in gravity changes. We solve for such signals in the form of not only linear trend but also quadratic term (acceleration/deceleration) of mass variations globally at a spatial resolution of 500 km. On continents they signify hydrological mass transport, where any linear trend in precipitation minus evepotranspiration is the input to and hence responsible for, the quadratic change in continental water storage and hence in gravity. Comparison studies of geographical patterns of the quadratic (representing acceleration/ deceleration) terms show interesting agreement of the hydrological model GLDAS with GRACE data in many major areas, providing independent assessment as to the quality and validity of the hydrological models for interannual applications.the Royal Astronomical Society and Blackwell PublishingJournal Articleapplication/pdfhttp://hdl.handle.net/2115/44791https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/44791/1/j.1365-246X.2010.04843.x.pdf0956-540X1365-246XAA10717798Geophysical Journal International18426736792011-02enginfo:doi/10.1111/j.1365-246X.2010.04843.xThe definitive version is available at www.blackwell-synergy.compublisher