GPS Reveals Antarctic Bedrock Rising

摘要

The entirety of West Antarctica contains enough ice that, if it were to melt, would cause oceans to rise 10 feet. While the West Antarctic ice sheet is at risk of collapse, GPS data suggests this crisis could be averted because the bedrock supporting it is rising.Using GPS, an international team of researchers found that the viscosity of the mantle under the West Antarctic Ice Sheet is much lower than expected, with the crust rebounding faster than expected, possibly stabilizing against catastrophic collapse. According to the study, in 100 years, the uplift rates at the GPS sites will be 2.5 to 3.5 times more rapid than currently observed.