Print Email Facebook Twitter GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia Title GRACE constraints on Earth rheology of the Barents Sea and Fennoscandia Author Rovira Navarro, M. (TU Delft Astrodynamics & Space Missions; Universiteit Utrecht) van der Wal, W. (TU Delft Astrodynamics & Space Missions; TU Delft Physical and Space Geodesy) R. Barletta, Valentina (Center of Electron Nanoscopy) Root, B.C. (TU Delft Astrodynamics & Space Missions) Sandberg Sørensen, Louise (Center of Electron Nanoscopy) Date 2020 Abstract The Barents Sea is situated on a continental margin and was home to a large ice sheet at the Last Glacial Maximum. Studying the solid Earth response to the removal of this ice sheet (glacial isostatic adjustment; GIA) can give insight into the subsurface rheology of this region. However, because the region is currently covered by ocean, uplift measurements from the center of the former ice sheet are not available. The Gravity Recovery and Climate Experiment (GRACE) gravity data have been shown to be able to constrain GIA. Here we analyze GRACE data for the period 2003-2015 in the Barents Sea and use the data to constrain GIA models for the region. We study the effect of uncertainty in non-tidal ocean mass models that are used to correct GRACE data and find that it should be taken into account when studying solid Earth signals in oceanic areas from GRACE. We compare GRACE-derived gravity disturbance rates with GIA model predictions for different ice deglaciation chronologies of the last glacial cycle and find that best-fitting models have an upper mantle viscosity equal or higher than <span classCombining double low line"inline-formula">3×1020</span> <span classCombining double low line"inline-formula">Pa s</span>. Following a similar procedure for Fennoscandia we find that the preferred upper mantle viscosity there is a factor 2 larger than in the Barents Sea for a range of lithospheric thickness values. This factor is shown to be consistent with the ratio of viscosities derived for both regions from global seismic models. The viscosity difference can serve as constraint for geodynamic models of the area. To reference this document use: http://resolver.tudelft.nl/uuid:3d3a0e28-33f3-4c93-b9b4-26dbab4c6de7 DOI https://doi.org/10.5194/se-11-379-2020 ISSN 1869-9510 Source Solid Earth, 11 (2), 379-395 Part of collection Institutional Repository Document type journal article Rights © 2020 M. Rovira Navarro, W. van der Wal, Valentina R. Barletta, B.C. Root, Louise Sandberg Sørensen Files PDF se_11_379_2020.pdf 5.78 MB Close viewer /islandora/object/uuid:3d3a0e28-33f3-4c93-b9b4-26dbab4c6de7/datastream/OBJ/view