Not exact matches
Also, the
outlet glaciers on Greenland are all variable in
flow speed and ice discharge, and I think RC did something before on the acceleration of Jakobshavns Isbrae.
This is in fact increasingly observed around the edges of Greenland and Antarctica in recent years:
outlet glaciers and ice streams that drain the ice sheets have greatly accelerated their
flow.
The margins usually slope more steeply, and most ice is discharged through fast -
flowing ice streams or
outlet glaciers, in some cases into the sea or into ice shelves floating on the sea.
Examination of recent rapid supraglacial (i.e. on the surface) lake drainage documented short term velocity changes due to such events around 10 %, but little significance to the annual
flow of the large
glaciers outlet glaciers (Das et.al, 2008).
There is a potential difference between the two, in
glacier such as most marine terminating
outlet glaciers, where the
glacier flow is rapid, acceleration results from retreat and thinning.
This mechanism has been examined in detail and has yielded short term accelerations in the 10 - 20 % range (Zwally et al, 2002)(Das et al, 2008), but is of little significance to the annual
flow of the large
outlet glaciers.
This is not the case on the rapid
flowing marine terminating
outlet glaciers.
Between the fast
flowing marine terminating
outlet glaciers, the ice sheet particularly in the southwest quadrant has numerous
glaciers that terminate on land or in small lakes.
The fast
flowing marine terminating
outlet glaciers of western and southeast Greenland (Rinks, Umiamako, Helheim, Jakobshavn, Epiq Sermia and Kangerdlussaq)
Pine Island
glacier, which
flows into the Amundsen Sea, is one of the main
outlets for West Antarctic ice.