Perspective: Rising seasGlaciers May Be Melting Faster Than We Expected
From Alaska to Antarctica, thousands of glaciers flow over the land and out to the ocean. These tidewater glaciers are rapidly retreating and melting, like much of Earth’s ice, continually adding to rising sea levels. But to date, scientists have struggled to pinpoint where on the face of a glacier’s terminus the most intense melting occurs—and exactly how fast it is happening. Until now.
From Alaska to Antarctica, thousands of glaciers flow over the land and out to the ocean. These tidewater glaciers are rapidly retreating and melting, like much of Earth’s ice, continually adding to rising sea levels. But to date, scientists have struggled to pinpoint where on the face of a glacier’s terminus the most intense melting occurs—and exactly how fast it is happening—because of the difficulty and danger involved in getting close enough to these frozen behemoths.
Jennifer Leman writes in Scientific American that now, however, a team of researchers has figured out how to directly probe these melt processes and has tested the method out on one glacier in Alaska. What it found, published this week in Science, is worrying: the glacier is melting far faster than current theories had suggested “The melt rates that we measured were about 10 to 100 times larger than what theory predicted,” says lead study author David A. Sutherland, an oceanographer at the University of Oregon.
