From 2009 to 2017, about 252 gigatonnes per year were lost
Yearly loss of ice from Antarctica has increased by an alarming rate of 280 per cent between 2001 and 2017. According to a study, the accelerated melting caused global sea levels to rise more than half an inch in the last four decades.
The researchers, including those from NASA’s Jet Propulsion Laboratory (JPL) and Utrecht University in the Netherlands, were able to discern that between 1979 and 1990, Antarctica shed an average of 40 gigatonnes of ice mass annually.
From 2009 to 2017, about 252 gigatonnes per year were lost.
The pace of melting rose dramatically over the four-decade period. From 1979 to 2001, it was an average of 48 gigatonnes annually per decade. The rate jumped 280 per cent to 134 gigatonnes for 2001 to 2017.
For the study published in journal Proceedings of the National Academy of Sciences, researchers conducted the longest-ever assessment of remaining Antarctic ice mass.
Spanning four decades, the project was also geographically comprehensive; the research team examined 18 regions encompassing 176 basins, as well as surrounding islands.
“As the Antarctic ice sheet continues to melt away, we expect multi-metre sea level rise from Antarctica in the coming centuries,” said Eric Rignot, professor at the University of California, Irvine in the United States (US).
Techniques used to estimate ice sheet balance included a comparison of snowfall accumulation in interior basins with ice discharge by glaciers at their grounding lines, where ice begins to float in the ocean and detach from the bed.