william colgan is on the ground tracking developments in greenland if enough snow were to fall further inland losing so much ice to the sea would not be such a problem. for this. area. that is just so. that is dealt the start finish in. greenland has the world's 2nd largest ice sheet half a century ago measurements taken by scientists in the northwest of the country showed that fresh snow kept adding new layers none of it melted. to assess whether the actions changed in recent decades william colgan and his colleagues are extracting ice cause any changes could have a profound impact on greenland ice cap the team examines the cause for any signs of dense ice which could only be due to melted snow. the most powerful inference for finding from the ice cores is that when we look at today we see every year the snow is interrupted by this hard thick layer where the snow has melted and we've frozen this hard clear ice. about 25 percent of the fresh snow that had been replenishing the ice for thousands of years is now melting that could set off a feedback loop that would threaten key aspects o

to assess whether that is changed in recent decades william colgan and his cause. or extracting ice cause any changes could have a profound impact on greenland's ice cap the team examines the cause for any signs of dense ice which could only be 2 to melted snow. the most powerful influence for finding from the ice course is that when we look at today we see every year the snow is interrupted by this hard thick layer where the snow has melted in the frozen this hard clear ice. about 25 percent of the fresh snow that had been replenishing the ice for thousands of years is now melting that could set off a feedback loop that would threaten a key aspect of the ice sheet its thickness. so you picture the ice sheet sort of and this is the ground here she has this shape it's high the center low at the sides so as the. begins to melt. it gets slower and as it gets slower it's moving dale into warmer layers of the atmosphere is called high or low and you get this feedback because if the farther the lower the ice melts to the lower elevation the iceberg problems the more melt

to assess whether that has changed in recent decades william colgan and his cause. or extracting ice cause any changes could have a profound impact on greenland's ice cap the team examines the cause for any signs of dense ice which could only be due to melted snow. the most powerful influence for finding from the ice cores is that when we look at them today we see every year the snow is interrupted by this hard 3rd layer where the snow has melted in the frozen is hard clear ice. about 25 percent of the fresh snow that had been replenishing the ice for thousands of years is now melting that could set off a feedback loop that would threaten a key aspect of the ice sheet its thickness. so you picture the ice sheet sort of and this is the ground here she has this shape it's high the center low at the sides so as the. begins to melt. it gets slower and as it gets slower it's moving dail into warmer layers of the atmosphere the atmosphere is called high or low and you get this feedback because the farther the lower the ice melts the lower elevation there is the more melts