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(1) If SG can be compared with GRACE, considering the resolution of GRACE, there should be ‘common’ signal between the SGs themselves in Europe. The first method is to look for correlation between the SGs, of which the significance can only be tested after removing the annual component. (2) Then, we explain that, in the framework of this study, the EOF tool does not provide usable results, with or without the annual component. However, for the interannual component, we wrote that that picture may change when longer time-series are available. (3) To investigate the annual component, the appropriate method is using phasors, as it allows an accurate comparison of the phases and amplitudes, unlike the correlation or EOFs. (4) After intercomparing SGs, we compare them with the hydrological and GRACE models. (5) The last part aims at demonstrating that correcting for local effects is pointless.

geophysical journal international

Reply to Comment on: ‘The quest for a consistent signal in ground and GRACE gravity time series’, by Michel Van Camp, Olivier de Viron, Laurent Métivier, Bruno Meurers and Olivier Francis