The Antarctic is melting so fast the whiole continent's ice shelf may be gone within our lifetime, scientists have warned.
The report, published in Nature Geoscience, predicts a doubling of surface melting of the ice shelves by 2050. And by 2100 the rate could surpass the point associated with ice shelf collapse.
Ice shelves are extensions of land ice projecting into the sea. They form a natural barrier blocking inland ice flow to the oceans. Their disappearance would remove that barrier and pave the way for dramatic rises in sea level, according to the study.
Lead researcher, Dr Like Trussel from the Woods Hole Oceanographic Institution in the US, said: “Our results illustrate just how rapidly melting in Antarctica can intensify in a warming climate.
“This has already occurred in places like the Antarctic Peninsula where we’ve observed warming and abrupt ice shelf collapses in the last few decades.
“Our model projections show that similar levels of melt may occur across coastal Antarctica near the end of this century, raising concerns about future ice shelf stability.”
The study was based on satellite observations of ice surface melting and climate simulations up to 2100. It showed that if greenhouse gas emissions continued at present rates, ice shelf collapse could occur by 2100.
Under a reduced-emission scenario the melting could be brought under control by 2050.
Co-author Dr Karen Frey, from Clark University in Massachusetts, said: “The data presented in this study clearly show that climate policy, and therefore the trajectory of greenhouse gas emissions over the coming century, have an enormous control over the future fate of surface melting of Antarctic ice shelves, which we must consider when assessing their long-term stability and potential indirect contributions to sea level rise.”
