NSF research vessel the Polar Duke, Palmer Station, Antarctica.

Adelie penguins, studied in pack ice/biological community interactions research at the Palmer Station, Antarctica LTER site.

A diver examines the under-side of the ice, which provides a unique habitat for krill in chilly Antarctic waters, Palmer Station LTER.

Ship-board sampling shown with a profiling instrument measuring water column characteristics such as temperature, conductivity, fluorescence, and irradiance near Palmer Station LTER.

Pelagic polar marine biome, Palmer Station LTER, Antarctica.

Camp buildings, Palmer Station, Antarctica LTER polar marine research site.