Combine With Multi-source Satellite Altimetry Data Inverse Gravity Anomaly In China Sea And Its Vicinity

Gravity anomaly is the differernt of the various points in the gravity vector and thenormal gravity vector quantities in gravity field because of Earth’s mass distributionirregular,and is the imporate data to study the shape of the Earth, the Earth’s internal structure,the gravity explorationand amend spacecraft orbit data,and is widely used in the field ofphysical oceanography and geophysics. However the long-standing lack of detection methodand detection technology backwardness cause serious lack of marine gravity data.Satellitealtimetry can provide a wide range of high-precision and long time series of sea surfaceobservations and its result can be a good interpretation of the marine geoid and gravityanomalies. With traditional technology and unparalleled advantage, it gradually becomes theprimary means of access to the marine gravity field data.This paper combine with Geosat, Geosat, ERS-1, ERS-1, ERS-2, Envisat, T/P, Jason-1and Jason-2satellite altimetry data edit and collinear process in order to effectively reducesthe capacity of the data. Using the reference ellipsoid and a frame of reference benchmarkunified obtain sea surface height value. Using the remove-restore technology based on theEGM2008gravity field model and DNSC08sea surface topography model, along withmulti-satellite altimeter data, the result of the residual along-track deflections of vertical wasobtained by the slope of two successive geoidal heights. Then based on the least squaresprinciple, the deflections of vertical gridded at2′×2′in China sea and its vicinity weredetermined using the along-track deflections of vertical and its azimuth. By the inverseVening-Meinesz formula, the gravity anomalies over China sea and its vicinity werecomputed using the residual deflections of vertical in different range and integral radius andcompared with the shipborne gravity anomalies respectively.According to the above process, the gravity anomalies gridding at2′×2′over China seaand its vicinity were determined with45′integral radius, removing the points that absolutevalue of the residual deflections of vertical was lager than3″. Comparing the results withshipborne data, the corresponding RMS is between3.92mGal and4.437mGal, and the totalaccuracy is4.154mGal...