Melt ponds shine in NASA laser altimeter flight images
Even from 65,000 feet above Earth, aquamarine melt ponds in the Arctic stand out against the white sea ice and ice sheets. These ponds form every summer, as snow that built up on the ice melts, creating crystal clear pools.
On July 16 and July 17, NASA's ER-2 aircraft flew above Alaskan glaciers and to the North Pole, carrying an instrument called the Multiple Altimeter Beam Experimental Lidar, or MABEL. MABEL is a laser altimeter, measuring the elevation of glaciers, mountains, forests and other topography below. Scientists will use those measurements to design analysis software, or algorithms, for the upcoming Ice, Cloud and land Elevation Satellite-2 mission.
The 2014 MABEL campaign continued through July and was launched, in part, to capture melt ponds and other features of summer ice. After nine science flights out of Fairbanks, Alaska, the ER-2 and MABEL returned to California on Aug. 1, gathering additional data along the way. For this campaign, engineers added a new camera system to allow the team to match the MABEL measurements with a visual glimpse of the ground. The digital camera takes a picture every 3 seconds, each frame capturing an area about 2.5 by 1.5 kilometers (1.6 by 0.9 miles).
Some of these first images downloaded were just what the MABEL team wanted to see, said Thorsten Markus, ICESat-2 project scientist at NASA's Goddard Space Flight Center in Greenbelt, Maryland. They want to understand how the MABEL data collected over a melt pond differs from data collected over open water, ice and more, and the images indicate there will be good measurements to analyze.
"We have clear open water, then we see melt ponds and then we see open water again," Markus said of a shot taken on the way to the North Pole. "For algorithm development, this is perfect."