Recovery of the gravity eld signal due to a low viscosity crustal layer in glacial isostatic adjustment models from simulated GOCE data

摘要

We use a glacial isostatic adjustment model, based on a semi-analytical normal mode technique and a pseudo-spectral sea level code, to simulate the effect of a low viscosity zone (LVZ) in the lower crust on GOCE satellite gravity gradient (SGG) measurements. We recover the gravity eld from simulated SGG measurements and try to assess how well the signal due to an LVZ can be extracted in the presence of measurement noise and model errors in the ice load history and the amount of isostatic compensation of topography. Using the correlation coef cient between the measurements and different Earth models, we conclude that GOCE data should be able to constrain the properties of the LVZ, if errors due to uncertainties in the ice load history can be minimized.