A melting pond inside an iceberg from the Greenland ice sheet in the Baffin Bay near Pituffik, Greenland, as captured with a drone during a NASA mission along with University of Texas scientists to measure melting Arctic sea ice.

New observations from ICESAT-2 show remarkable Arctic Sea ice thinning in just three years.

Over the past two decades, the Arctic has lost about one-third of its winter sea ice volume largely due to a decline in sea ice that persists over several years, called multiyear ice, according to a new study.

The study also found sea ice is likely thinner than previous estimates.