Lake Atna filled the Copper River valley from about 60,000 to 10,000 years ago. Glennallen, Copper Center and Gulkana were underwater then, in the depths of a water body twice the size of the Great Salt Lake. 

Ned Rozell
Small mammals such as shrews, voles, mice and lemmings will likely shift their distribution across Alaska in coming decades as the climate warms, with some species gaining ground and others losing out, a new study says.Yereth Rosen
While snorkeling in Alaska’s largest lake, Stephanie Carlson watched sockeye salmon change from aggressive red creatures with the jaws of wolves to drab, lethargic slugs. That conversion was so quick that she wondered if fish that fall apart faster have some advantage over fish that linger.Ned Rozell
The Perseid meteor shower, widely regarded as the best meteor shower of the year, will peak this week and be visible to many in Alaska after midnight and through the pre-dawn hours.Jeannette Lee Falsey
One of the quietest places in Alaska was temporarily home to a few hardy people when the Mayflower landed at Plymouth Rock. An archaeologist has fleshed out what life might have been like during a winter on St. Matthew Island in the 1600s.Ned Rozell
The world’s glaciers are retreating at a faster rate than any time in recorded history, according to a new study published online in the Journal of Glaciology.Asaf Shalev
The University of Alaska Fairbanks Professor Vladimir Romanovsky has been named chief scientist for the U.S. Department of Energy initiative titled the Next-Generation Ecosystem Experiments. Romanovsky is a professor of geophysics at the UAF Geophysical Institute. Carey Restino | Arctic Sounder
The agenda for Monday's Arctic conference is heavy on Alaska speakers, and the topics go beyond climate change.Yereth Rosen
Since the mid-20th century, Alaska and the Arctic have been warming about twice as fast as the global rate. Over the past five decades, average Alaska temperatures have increased by 3.4 degrees Fahrenheit, with the increases most pronounced in winter -- a change noticed by Native elders decades ago.  Yereth Rosen
Science was in the spotlight when the U.S. Arctic Research Commission came together for its second and final day of meetings in Nome, covering a range of topics -- from fire forecasts and walrus tagging to sea ice loss and the nutritional value of reindeer meat.Laura Kraegel | KNOM