Good Friday Bay Glacier
Good Friday Bay Glacier is one of the very few tidewater glaciers on Axel Heiberg Island and has been identified as a surging type which advanced a total of 7.6 kilometres between 1952 and 1999, with ice velocities exceeding 250 metres per year (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.).
Tongue of Good Friday Bay Glacier on June 1, 1977. Intensive crevassing indicates surging. However, the sea ice in the bay seems relatively undisturbed suggesting an only moderate advance.
Good Friday Bay Glacier on August 24th, 1977 seen from the NE. A major ice-dammed lake is in the lower centre of the the aerial photo.
Good Friday Bay Glacier on August 24th, 1977 (upper left). Only few icebergs are flowting in the bay indicating that most of the tongue is grounded. Note small piemont glacier in the foeground.
Identical photo as the previous one, annotated with the approximate extent of the tongue in 2008.
Complex interaction on the true left margin of Good Friday Bay Glacier (lower right), a small tributary (top) and an ice-dammed lake (left below centre). En echelon crevasses near the right margin of the photo indicate shearing of the ice (August 24th, 1977).
Good Friday Bay Glacier on July 1, 2008 from the west. A large ice-dammed lake was formed as a result of the tongue's advance (left). Sea ice in the foreground is overthrusted by the advancing terminus.
Identical photo annotated with the approximate extent in 1977 (red) and 2008 (orange). The absence of large icebergs indicates that most of the tongue is grounded (patches in the foreground are two year old sea ice).
Tele photo view of a small nunatak which formed as a result of the glacier's advance. The ice flows clockwise all around it (July 1, 2008).
Nunatak and large ice-dammed lake fomed by Good Friday Bay Glacier's advance (July 1, 2008).
The nunatak seen on July 23rd, 2008. On the right are looped ice structures which are indicative of surge type glaciers.
Meltwater-filles crevasses on Good Friday Bay Glacier's advancing tongue (July 23rd, 2008).
Narrow tributary of Good Friday Bay Glacier (July 23rd, 2008).
|Photos Jürg Alean|