Inversion of global marine gravity anomalies with vertical deflection method deduced from Laplace equation

doi:10.11947/j.AGCS.2020.20190108

Abstract

Abstract: The quality of marine gravity field derived from satellite altimetry mainly relies on denser data coverage, enhanced spatial resolution as well as improved range precision. In this study, a comparison of application effect for several waveform retracking methods is firstly executed on the basis of multi-satellite altimetry dataset sincluding Geosat GM/ERM,ERS-1 GM/ERM, TOPEX/Poseidon,Envisat,Cryosat-2,Jason-1 ERM/GM and SARAL/AltiKa. According to the statistics of along-track standard deviation, the two-step retracker proposed by Sandwell is superior to other retrackers such as MLE-4, threshold, advanced threshold, and β-5 parameter fitting method. Tuned parameters for certain low-pass filtersare given within the resampling procedure for each altimeter mission in order to calculate accurate along-track slopes. Then a 1'×1' global marine gravity field model is inversed based on the remove-restore procedure by introducing the EGM2008 as reference model. The root mean squares (rms) of difference are respectively 3.4 mGal and 1.8 mGal by comparing with DTU13 and SIO V23.1 model. Meanwhile, the comparison with ship-measured data results a RMS range of 4~8 mGal, while better coincidence shows up in typical ocean areas. In summary, both the comparisons indicate that the new model has a comparable accuracy level with DTU13 and V23.1 at designed 1'×1' grid interval.

Key words: satellite altimetry, waveform retracking, vertical deflection, gravity anomaly

CLC Number:

P228.3

ZHANG Shengjun, LI Jiancheng, KONG Xiangxue. Inversion of global marine gravity anomalies with vertical deflection method deduced from Laplace equation[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(4): 452-460.

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