GeoLog

glacier

Imaggeo On Monday: A meander in the meltwater valley

Imaggeo On Monday: A meander in the meltwater valley

At the edge of the Greenland Ice Sheet, surface melt releases old layers of dust, that have travelled thousands of years into the ice. Under sunny weather, the dust heats up with radiation, melts the ice underneath, and thus accumulates in tiny potholes and meltwater creeks. However, this photo was taken after a rainy day. The rain triggered increased melt on the surface of the ice irrelevant of i ...[Read More]

Imaggeo On Monday: Contorted Streams on the Gates Glacier

Imaggeo On Monday: Contorted Streams on the Gates Glacier

Annual ridges and troughs (called wave ogives) are formed as the ice of the Gates Glacier (in Alaska’s Wrangell Mountains) flows through a steep icefall. Down-glacier, as the ice melts, the rushing meltwater is funnelled into streams, carving ice canyons as it flows, but ultimately directed by these topographic constraints.   Description by Allen Pope, after the description on imaggeo.e ...[Read More]

Imaggeo On Monday: Onsala Twin Telescopes

Imaggeo On Monday: Onsala Twin Telescopes

“The Onsala Twin Telescopes are part of the global geodetic Very Long Baseline Interferometry (VLBI) network. Radio telescopes all around the globe are observing extra-galactic radio sources simultaneously to determine Earth orientation parameters, source positions and station coordinates, as well as velocities. Geodetic Very Long Baseline Interferometry is used to maintain the International ...[Read More]

Imaggeo On Monday: Elephant Foot Glacier in Greenland from a Twin Otter perspective

Imaggeo On Monday: Elephant Foot Glacier in Greenland from a Twin Otter perspective

“I was told that there will be a piedmont glacier on the way from Station Nord, a Danish military base in northeast Greenland, to our destination in no-man’s-land next to the 79°N Glacier. On half the way, we passed the beautiful Elephant Foot Glacier, named after its symmetric shape originating from the viscous flow of the ice. The glacier is located on a peninsula and connected to a small ...[Read More]