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Tijana Janjić, Lars Nerger, Alberta Albertella, Jens Schröter, and Sergey Skachko

filter length is driven by the spatial resolution of the gravity field. For the GRACE-based gravity field model ITG03s ( Mayer-Gürr 2007 ), the filter half-width is typically 240 km. The polar areas, part of the Indonesian region, and the Mediterranean Sea are characterized by low data accuracy due to the presence of ice or complex bottom topography. For this reason, the observational data are substituted in these regions by the values of the ( Rio et al. 2005 , hereafter RIO05 ) mean dynamical

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