NASA’s DC-8 is on its second tour to survey the world’s atmosphere.
Scientists on the ATom mission are looking for changes in atmospheric gases
that occur due to the seasons.
First stop: Alaska.
Last summer, evidence of Siberian fires was in the air.
This winter, pollution from Asia dominated.
Out the window, the team observed our changing planet.
The sea ice appeared much thinner than is usual for this time of year.