Images

Satellite image of Taku Glacier in October 1, 2018. The Norris Glacier can be seen on the lower left hand corner and the Hole-in-the-Wall Glacier in the upper center portion of the image.

Skinny Common Murre with keel protruding. Lower Cook Inlet, Alaska

Group of walruses on beach between Hook and Cinder lagoons on the Alaska Peninsula.

Group of walruses hauled out on beach near rocks at bottom on cliff. The photo was taken at Cape Seniavin on the Alaska Peninsula. 

A scientist prepares to extract a snow core from one of the Benchmark Glaciers. Cores are used to determine the density of the snow and ice on the surface of the glacier in order to determine the mass balance.

USGS scientist, Chris McNeil, measures and weighs an ice core extracted from Wolverine Glacier to determine the density of the firn layer.

Aerial view of the edge of a large walrus herd hauled out on the northwestern shores of Alaska.  The image was taken using an unoccupied aerial system, commonly referred to as a survey drone that was flown to collect imagery of walruses resting on shore in 2018 and 2019 for estimating the abundance of walruses that use the U.S.

Walruses identified as being in an appropriate position for measurement from an image collected by a USGS survey drone on September 6, 2018, at a haulout near Point Lay, Alaska.

A gravel bar on the north fork of the Agashashok River, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that is rapidly warming.

Lindsay Carlson swabbing hunter-harvested ducks in western Alaska as part of USGS research to investigate the persistence of avian influenza viruses in North American wetlands.  USGS scientists and colleagues found that influenza A viruses may remain infectious in surface waters of northern wetlands for more than seven months. 

A misty morning in the headwaters of the Akillik River, Alaska. This work is part of the Hydro-Ecology of Arctic Thawing (HEAT): Hydrology project that takes place in the Arctic Network Parks because they lie in a region that is rapidly warming.

Skinny Common Murre with keel protruding. Lower Cook Inlet, Alaska

Twentymile River sonar on a bridge

A Peregrine Falcon flies off with a Black-legged Kittiwake from its colony at Gull Island, Alaska.

A Glaucous-winged Gull on the rock floor of the Bogoslof Volcano a year after it explosively erupted.

A Glaucous-winged Gull on the rock floor of the Bogoslof Volcano a year after it explosively erupted.

Knik River sonar on a bridge

A scientist at The Kink on North Fork Fortymile River. He is standing next to gravel that was in the river in 1900 but is now on the rim of a 20-foot-deep bedrock canyon. The canyon formed as a result of human mining activity that diverted the river in 1900.

A scientist standing on the pre-1900 riverbed that is now 20 feet above the rapids at The Kink on the North Fork Fortymile River. The Kink resulted from human mining activity that diverted the river in 1900.

A USGS scientist standing on the pre-1900 riverbed that is now the rim of the bedrock canyon at The Kink on North Fork Fortymile River. The Kink resulted from human mining activity that diverted the river in 1900.

A scientist investigates a bedrock canyon cut by the North Fork Fortymile River in response to human mining activity in 1900. The smooth grooves on the rock in the lower right corner were formed by river erosion in the last century.