Abstract
AbstractWith the advent of satellite gravity measurements, this new technique which is different from Satellite Laser Ranging (SLR) provides a new approach to determine the Earth's dynamic ellipticity (EDE). The Gravity Recovery and Climate Experiment (GRACE) is the latest satellite gravity mission, and the accuracy of low degree Stokes coefficients of the gravity field models derived from GRACE has been greatly improved. However, the results of EDE from GRACE do not agree well with that from SLR measurements. In this paper, the maximum entropy spectral analysis and wavelet analysis are used to assess the data sets EDE from GRACE and SLR. The results show that the interannual amplitude of the EDE signal from GRACE is only 25% of that from SLR, and GRACE EDE signals contain inputted system information and great phase difference, but the former reveals stronger short‐term (2–6 months) signals than the later. These differences might be caused by the un‐synchronism of the global measurements from GRACE and SLR.
Published Version
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