The IMBIE Assessment

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IMBIE was established with the aim of providing reconciled estimates of ice sheet mass balance. In 2012, IMBIE achieved this aim, reconciling existing measurements using satellite altimetry, gravimetry and the input-output method (Shepherd et al., 2012).  It showed a good agreement between estimates of Antarctic and Greenland mass balance determined from the three techniques, and also improved the coverage and confidence of results.

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Cumulative mass change and sea level contributions from the Antarctic, Greenland, and combined Antarctic and Greenland ice sheets

Importantly, since its completion, new satellite missions, techniques, geophysical corrections and teams have continued to evolve, leading to an additional 52 and 34 published mass balance estimates for Greenland and Antarctica respectively.

 

Estimates of Greenland (top) and Antarctic (bottom) ice sheet mass balance published before (red) and after (blue) the first IMBIE assessment (grey).

Estimates of Greenland (top) and Antarctic (bottom) ice sheet mass balance published before (red) and after (blue) the first IMBIE assessment (grey). (Briggs et al., in press – see reference list)