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Scientists, have been underestimating ice loss by,
. . . 20 billion metric tons per year.

"By refining the spatial pattern of mass loss,
. . . in the world's 2nd largest, and most unstable ice sheet, and
. . . learning how that pattern has evolved,
. . . we are steadily increasing our understanding of ice-loss processes,
. . . which will lead to better-informed projections of sea-level rise," said Bevis.

The study has implications for Antarctica,
. . . the 800-pound gorilla of global sea-level rise.
Scientist will need to deploy more GPS measurement stations, at Earth's southern pole,
. . . to accurately measure the flow of mantle beneath the continent, and
. . . get a better reading of Antarctic ice melt.

9-23-2016 Source:  Greenland Ice Sheet Melting 7% Faster