Focusing on Greenland, what do observations tell us has been happening to the Greenland ice sheet? Satellites use gravity data to measure the total mass balance and have found the ice sheet is losing ice mass at an accelerating rate ( Velicogna 2009).įigure 1: Ice mass changes for the Greenland ice sheet estimated from GRACE satellite measurements. While there are uncertainties over the specifics of ice sheet behaviour, there are several lines of independent evidence that paint a consistent picture of how ice sheets will respond to global warming. At our current rate, we should pass 400 ppm within 10 years. A new paper ( Stone 2010) has been published that estimates that the CO2 level that will lead to collapse of the Greenland ice sheet is between 400 to 560 parts per million (ppm). Consequently, how these ice sheets respond to warming temperatures is a crucial area of research. East Antarctica would contribute 70 metres of sea level rise but is less prone to collapse. Similarly, the West Antarctic ice sheet would contribute around 6 metres sea level rise. If the Greenland ice sheet was to completely collapse, it would contribute as much as 7 metres sea level rise. What CO2 level would cause the Greenland ice sheet to collapse? Posted on 23 March 2010 by John CookĪ matter of concern is the potential instability of the Greenland and Antarctic ice sheets.
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