More of the world’s coastal glaciers are melting faster than ever, but exactly what’s triggering the large-scale retreat
has been difficult to pin down because of natural fluctuations in the glaciers’ surroundings. Now, researchers at the University of Texas Institute for Geophysics and Georgia Tech have developed a methodology that they think cracks the code to why coastal glaciers are retreating, and in turn, how much can be attributed to human-caused climate change. Attributing the human role for coastal glaciers — which melt directly into the sea — could pave the way to better predictions about sea level rise.
The next step, the researchers said, is for scientists to simulate the coastal glaciers of a real ice sheet, like Greenland’s, which holds enough ice to raise sea level by about 22 feet . That will reveal whether they are retreating due to climate change and help predict when major ice loss might next occur.
That, said co-author and UTIG glaciologist Ginny Catania, is why the last Intergovernmental Panel on Climate Change report found there was still too much uncertainty about coastal glaciers to say whether their retreat is due to human-caused climate change or natural climate fluctuations. When the scientists ran models without human-caused climate change, they found it virtually impossible for more than a few of the glaciers to begin retreating within years of each other.have been in varying states of retreat.
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