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ERROR IN GIA MODEL FIXED

The coding error previously reported in our model of Glacial Isostatic Adjustment (GIA ~=PGR) has been fixed, the corrected GIA grids are online, and the GRACE monthly grids using the corrected GIA are also online. A coding error in the software that computes GIA was reported in late 2009. The nature of the bug caused polar wander feedback to be accidentally turned off, and so was the rotational feedback. The effect had the spatial pattern of spherical harmonic term (2,1), was less than 2 mm/yr in equivalent water thickness everywhere over the globe, caused less than 0.05 mm/yr in a global sea level rise estimate. We replaced the incorrect GIA fields with corrected ones, and replaced all the GRACE monthly fields (both oceans and land) with corrected ones.

12.20.2010

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