Iceberg Glacier is one of the very few tidewater glaciers on Axel Heiberg Island and has been identified as a surging type (Copland L., Sharp M. and Dowdeswell J. 2003: The distribution and flow characteristics of surge-type glaciers in the Canadian High Arctic, Annals of Glaciology 36 2003, p.73-81.). In 1977 it was observed during a quiescent phase, when it was receeding, produced tabular icebergs and had a characteristically potholed surface. In 2007 it was found to have a terminus position rather similar to 1999 and which was, at the southern margin, nearly 10 kilometres more advanced than in 1977. The advance was much smaller at the northern margin (see 5th image below). A major tributary of Iceberg Glacier is one arm of Finsterwalder Glacier.
Aerial view of Iceberg Glacier and Iceberg Bay looking SW (Aug. 24th, 1977). The tongue appears to be in a quiescent state and produces large tabular icebergs.The ice on the lower left, to the left of the curved medial moraine, is from Finsterwalder Glacier.
Terminus of Iceberg Glacier on Aug. 24th, 1977. Deeply incised and curved meltwater channels, the potholed surface and the tabular icebergs are indicative of a surge-type glacier in its quiescent phase during which recession takes place.
Iceberg Glacier on Aug. 24th, 1977, looking towards NE. Note the big supraglacial river transporting sediment from left to lower right accross the tongue. This channel is no longer present in the 2008 photos since the glacier has thickened by then, and meltwater from the side can no longer flow on to its surface.
Similar view of Iceberg Glacier as in the previous photo, but as anaglyph (3D) image. Red-blue or red-cyan glasses are needed to see the stereoscopic effect (Aug. 24th, 1977).
Satellite image assembly from The Atlas of Canada (Toporama). Iceberg Glacier is entering the sea on the left. Green marks the frontal position estimated from terrestrial and aerial photos taken in 1977, red is the approximate front in 2008. Agate Fjord with many stranded icebergs from this glacier is even further left.
Calving front of Iceberg Glacier, aerial view towards North (July 2nd, 2008). Many icebergs have calved into the sea but are restrained from floating out into the bay by the remaining sea ice. Note the reflection of the mountain in the open water.
Wide angle view from a similar position as in the previous image. The bright ice surrounded by a looped moraine in the righthand part of the image is from Finsterwalder Glacier (July 2nd, 2008).
Southern portion of Iceberg Glacier's calving front. Brown, turbid water from intra- or subglacial meltwater streams is entering the green seawater. Note the dark turquoise meltwater pond near the cliff, on the left of the medial moraines.
Detail of the calving front and many icebergs (July 2nd, 2008).
Icebergs from Iceberg Glacier have stranded in Agate Fjord (photo Melissa Battler 2008).
Open water and sea ice (right) in front of Iceberg Glacier (July 2nd, 2008).
Lowest part of Iceberg Glacier's tongue seen from the North (July 2nd, 2008).
The advance of Iceberg Glacier has caused the formation of a large ice-dammed lake (here with floes of lake ice) which was not yet present in 1977 (photo Melissa Battler 2008).
Iceberg Glacier and the new, large ice-dammed lake on the upper left. Iceberg Bay is on the upper right.
Finsterwalder Glacier with two tongues (top left and top centre) and Iceberg Glacier (Aug. 24th, 1977).
Finsterwalder Glacier (left and centre) and Iceberg Glacier (far right) on July 2nd, 2008, looking in approximately the opposite direction as in the previous photo.
Looking along the central part of Iceberg Glacier; Swiss Range on the left. Curved medial moraines indicate irregular inflow of tributary glaciers, probably associated with surges (Aug. 24th, 1977).
A tributary glacier is entering the main part of Iceberg Glacier after descending from Mueller Icecap and traversing the highest part of the Princess Margaret Range (Aug. 24th, 1977).
Deeply incised and meandering meltwater channels on Iceberg Glacier as well as the relatively smooth surface indicate that the glacier is in a quiescent phase between surges (Aug. 24th, 1977).
Terrestrial panorama photo of Iceberg Glacier from the south. The photo is very wide and probably requires scrolling to the right (June 29th, 1977).
|Photos Jürg Alean unless mentioned otherwise|