Caribou Herds in Arctic Alaska Tundra Areas are on Opposite Trends

A caribou is seen in Gates of the Arctic National Park and Preserve.

The Western Arctic Caribou Herd, once the biggest in Alaska, is faltering, having fallen from a high of 490,000 animals in 2003 to only 152,000 as of 2023. But to the east, the Porcupine Caribou Herd appears to be thriving, with an all-time high of 218,00 animals recorded at the last census.

Warm winter culture

Dogs mushing down a strip of snow in Anchorage.

Longstanding Alaskan traditions are being shaped by warming winters. 2025 was no exception.

Reading Rings: Subfossil Wood Reveals a Glacier’s Climate History

A scientist holds a piece of wood showing different growth rings.

In 2023, research ecologist Jeremy Litell, along with students and staff from the Juneau Icefield Research Program, skied miles across glaciers and ice ridges to follow up on a report of a five-needle pine tree dwelling in the gnarled, patchy, treeline, known as an alpine ecotone, that lined the Llewellyn Glacier.

Upcoming Webinar to Help Alaska Fire Managers Plan for an Uncertain Future

Boreal forest regrowth 11 years after a forest fire in the snow.

Fire seasons are changing, and Alaska Climate Adaptation Science Center science is trying to help fire managers prepare.

Jeremy Littell, an AK CASC research ecologist, is presenting on what those changes might look like in a webinar for the Alaska Fire Science Consortium Tuesday, April 21.

Littell will explain how future projections from ALFRESCO fire modeling and the Canadian Forest Fire Danger Rating System (CFFDRS) may be used to plan for future changes in fire regimes and weather.

The Alaska CASC Goes to Washington

Three members of the Alaska CASC stand outside the US Capitol Building.

Each year, folks on the university side of the Alaska Climate Adaptation Science Center (AK CASC) make a trek to Washington D.C. The purpose of the visit is to meet with policymakers to share updates about the work that we do to provide communities with actionable science they can use to make decisions related to climate impacts, adaptation, and resilience.

Alaska CASC at AGU 2025

Discover featured posters and presentations by AK CASC researchers, faculty, and staff at this year’s American Geophysical Union meeting in New Orleans – the biggest annual event in American science.