A detailed view of ice floes in the Arctic taken by scientists working on Nasa’s Operation Icebridge campaign to measure sea ice thickness in the rapidly changing Arctic. The top image includes an area of open water or thin ice either near the edge of the ice cap or a polynya, an area of open water surrounded by ice. The ocean is black. Thinner ice is darker, semi-transparent. It lacks the coat of snow that brightens the thick ice. Layers of thin ice create the white stripes along the edge of the floe
Photograph: DMS/P-3B Earth science aircraft/NASA