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Antarctica, Greenland and Gulf of Alaska land-ice evolution from an iterated GRACE global mascon solution

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Abstract:

We have determined the ice mass evolution of the Antarctic and Greenland ice sheets (AIS and GIS) and Gulf of Alaska (GOA) glaciers from a new GRACE global solution of equal-area surface mass concentration parcels (mascons) in equivalent height of water. The mascons were estimated directly from the reduction of the inter-satellite K-band range-rate (KBRR) observations, taking into account the full noise covariance, and formally iterating the solution. The new solution increases signal recovery while reducing the GRACE KBRR observation residuals. The mascons were estimated with 10 day and 1 arcdeg equal-area sampling, applying anisotropic constraints. An ensemble empirical mode decomposition adaptive filter was applied to the mascon time series to compute annual mass balances. The details and causes of the spatial and temporal variability of the land-ice regions studied are discussed. The estimated mass trend over the total GIS, AIS and GOA glaciers for the time period 1 December 2003 to 1 December 2010 is –380±31 Gt a–1, equivalent to –1.05±0.09 mm a–1 sea-level rise. Over the same time period we estimate the mass acceleration to be –41±27 Gt a–2, equivalent to a –0.11±0.08 mm a–2 sea-level acceleration. The trends and accelerations are dependent on significant seasonal and annual balance anomalies.

Document Type: Research Article

DOI: http://dx.doi.org/10.3189/2013JoG12J147

Publication date: August 1, 2013

More about this publication?
  • The Journal of Glaciology is published six times per year. It accepts submissions from any discipline related to the study of snow and ice. All articles are peer reviewed. The Journal is included in the ISI Science Citation Index.
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