Clouds over the central Greenland Ice Sheet last July were 鈥渏ust right鈥 for driving surface temperatures there above the melting point, according to a new study by scientists at the National Oceanic and Atmospheric Administration and the universities of Wisconsin, Idaho and baby直播app. The study, published April 3, 2013 in Nature, found that thin, low-lying clouds allowed the sun鈥檚 energy to pass through and warm the surface of the ice, while at the same time trapping heat near the surface of the ice cap. This combination played a significant role in last summer's record-breaking melt.