Solid Earth Uplift Due To Contemporary Ice Melt Above Low?Viscosity Regions of the Upper Mantle

Glacial isostatic adjustment explains topographic change in formerly and currently glaciated regions, but the role of small (?100s km) regions unusually low-viscosity mantle is poorly understood. We developed viscoelastic models with upper mantle, measured effect these on solid earth uplift resulting from contemporary surface ice melt. found viscous occurring decadal timescales above region, at rates comparable to or larger than those elastic response age melting. find that are sensitive location, dimensions, viscosity largest uncertainty likely comes region's horizontal extent. Rapid ground can impact dynamics if region located close an sheet margin, as for Antarctica Greenland.