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Tidligere skrev Polar Portal:

Ud fra disse data ses det, at den grønlandske indlandsis i perioden 2003-2011 har mistet i gennemsnit 234 km3 vand årligt, og det svarer til et årligt bidrag til den gennemsnitlige havstigning på 0,65 mm (Barletta et al. (2013)).

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Der gøres opmærksom på, at de masseændringer, der vises her, ikke er korrigeret for de masseændringer, der skyldes Glacial Isostatic Adjustment.

Nu skriver Polar Portal:

Disse data er baseret på DTUs gravitational Mass Balance (Barletta et al. 2020). Ud fra disse data ses det, at den grønlandske indlandsis i perioden 2003-2025 har mistet i gennemsnit 252 km3 vand årligt, og det svarer til et årligt bidrag til den gennemsnitlige havstigning på 0,69 mm (Caron et al. (2018)).

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Der gøres opmærksom på, at de masseændringer, der vises her, er korrigeret for de masseændringer, der skyldes Glacial Isostatic Adjustment, med en model udviklet af Caron et al., 2018.

Abstract
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We find that best fit models poorly capture the statistical inferences needed to correctly invert for lower mantle viscosity and that GIA uncertainty exceeds the uncertainty ascribed to trends from 14 years of GRACE data in polar regions.

4 Conclusion
An ensemble of 128,000 forward model runs is informed by a data set of 11,451 RSL and 459 GPS data, jointly varying both the Earth rheological structure and ice history.
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3. The uncertainty here is generally greater than in past scientific reports. We find the global median of relative uncertainty to be about 44% of the gravity rate. We may still be somewhat underestimating this uncertainty due to limitations in our treatment of ice history and azimuthally averaged rheology.
4. In regions above 60° latitude, our uncertainty in gravity trends clearly exceeds the discrepancy between CSR and JPL GRACE Release 05.

Further progress to obtain realistic GIA uncertainties can be made by improving the available constraints. For Greenland, there are additional GPS and RSL data sets that can be used to reduce our estimates of uncertainties in a future analysis. Future work should also more closely scrutinize lateral variations of the viscosity and associated local ice history, particularly in Antarctica and Greenland.

Data distribution used for glacial isostatic adjustment inversion constraint. Blue circles: mean local relative sea level (RSL) from the compilation used in Caron et al. (2017); orange and green triangles: RSL maximum and minimum bounds, respectively, from Dyke et al. (2002); teal circles: mean local RSL from the compilations of Briggs and Tarasov (2013), Milne et al. (2005), and Verleyen et al. (2017); and red crosses: Global Positioning System trends from Blewitt et al. (2016).