Sea Level Predicition Not A Prediction
Jonathan Bamber, a glaciologist at the University of Bristol, and not part of the research team, said: "The study provides a lot of rich detail about the variability in ice sheet dynamics, but does not dramatically change our overall understanding. The new work shows the situation is not as bad as the worst possible case, but it is still serious for future sea level rise and is certainly more complex than many of the models suggest."
Other recent satellite science has revealed complexities in other parts of the world, with the world's greatest peaks in the Himalayan mountain chain revealed as having lost no ice in the last decade. Another study showed the Karakoram glaciers as having grown over the last decade. However, the contribution to sea level rise of these and other mountain chains such as the Andes and Alps are dwarfed by Greenland and Antarctica and, globally, 443-629bn tonnes of meltwater are added to the world's oceans each year. This is raising sea level by about 1.5mm a year, in addition to the 2mm a year caused by expansion of the warming ocean.
Earlier analyses of Greenland's glaciers found their speed has doubled in 10 years and were accelerating. Extrapolation of that doubling implied glacier loss in Greenland would drive up sea level by 9cm by 2100, leading to an overall rise of 80cm. Another extrapolation imagined a tenfold rise in glacier speed, leading to 47cm of sea level rise from Greenland and 2m overall. The new research shows glacier acceleration remains "well below" even the lower scenario.
"A doubling in all glacier speeds was never a prediction for Greenland, it was a thought experiment, a "what if" scenario," said Bamber.
It wasn't a prediction so it wasn't wrong. See.