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Title of Journal: J Geod

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Abbravation: Journal of Geodesy

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Springer-Verlag

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10.1016/0009-2614(86)85093-x

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1432-1394

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Bias in GRACE estimates of ice mass change due to

Authors: M G Sterenborg E Morrow J X Mitrovica
Publish Date: 2012/12/16
Volume: 87, Issue: 4, Pages: 387-392
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Abstract

Observations of spatiotemporal variations in the geopotential using the GRACE satellites have been used to estimate recent mass fluxes from polar ice sheets and glaciers However these estimates have not considered the potential bias associated with the migration of water that accompanies the ice melt This migration is driven by the diminished gravitational attraction of the melting ice reservoir and this migration as well as the crustal loading it induces will contribute to the observed geopotential anomaly The extent to which this contribution contaminates the ice mass flux estimates depends on how far the smoothing filters applied to the GRACE data extend beyond the ice margins into the ocean Using the Antarctic Peninsula as a case study we estimate the magnitude of this bias for a range of melt areas and Gaussian smoothing filter radii We conclude that GRACE estimates of ice mass loss over the Antarctic Peninsula are systematically overestimating the loss by up to 10  for filter radii of less than 500 km

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  13. Thermosteric Effects on Interannual and Long-term Global Mean Sea Level Changes
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  18. A new isostatic model of the lithosphere and gravity field
  19. Convex optimization under inequality constraints in rank-deficient systems
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