July 2012 melt event far surpassed previous record
By Summit Voice
SUMMIT COUNTY — Along with an unusual constellation of low clouds, changes the jet stream were also a factor in last summer’s exceptional surface melt of the Greenland Ice Sheet, according to a research team led by the University of Sheffield’s geography professor Edward Hanna.
A NOAA study published in March indicated that a lingering layer of thin, low clouds helped intensify atmospheric conditions leading to the meltdown.
Hanna and his colleagues used a computer model simulation (called SnowModel) and satellite data to confirm that last summer’s meltdown was unprecedented in the past 50 years. About 90 percent of the ice-sheet surface melted July 11, far surpassing the previous known surface melt extent record of 52 percent in 2010. Continue reading “Climate: Last summer’s Greenland ice sheet surface meltdown linked with an unusual kink in the jet stream”