Kugururok River confluence Noatak National Park and Preserve, Alaska
Mainstem of Kugururok River located in Noatak National Park and Preserve, Alaska. Recent observations from Arctic Alaska indicate that waters draining permafrost landscapes may be susceptible to iron and carbon mobilization following thaw. One consequence of these altered iron-cycling processes is the abrupt change in color (orange) of stream and river reaches, reflecting a dramatic shift in water quality.
Photo by Jon O'Donnell, National Park Service