There are several cautions here. That ± 0.2mm is a 1 sigma error bar, so this is only a two-sigma result. Furthermore, it's a short time period, so we don't know how this fits into an overall trend. Finally, it's a new method, so if the referees missed a methodological problem, that will show up in time. In particular, the ice mass loss signal emerges as an offset to a sizeable correction due to post ice-age rebound which has to be estimated from ice history models. That sounds a little scary to me - I'd feel better seeing this replicated with other independent analyses.

All that said, it's certainly not in the good news column. If this result holds up, it suggests that Greenland and WAIS are contributing roughly equally to sea level rise at present.

We discussed sea level rise before in

• Living in the Eemian
• Greenland, or why you might care about ice physics