Nioghalvfjerdsbrae

Nioghalvfjerdsbrae
Velocity flow over the Nioghalvfjerdsbrae.
Map showing the location of Nioghalvfjerdsbrae
Location within Greenland
Location Greenland
Coordinates 79°0′N 25°0′W / 79.000°N 25.000°W / 79.000; -25.000Coordinates: 79°0′N 25°0′W / 79.000°N 25.000°W / 79.000; -25.000
Area 103,314 km2 (39,890 sq mi)
Length 89 km
Width 20 km
Terminus Nioghalvfjerd Fjord, Greenland Sea

Nioghalvfjerdsbrae (79°00′N 025°00′W / 79.000°N 25.000°W / 79.000; -25.000), sometimes referred to as "79 N Glacier", is a large glacier located in northeast Greenland. It drains an area of 103,314 km2 (39,890 sq mi) of the Greenland Ice Sheet with a flux (quantity of ice moved from the land to the sea) of 14.3 km3 (3.4 cu mi) per year, as measured for 1996.[1]

Geography

The glacier has had an 80 km long and 20 km wide floating tongue, widening toward its terminus north of Lambert-Land.[2] There are two calving fronts where the glacier meets the ocean, separated by Hovgaard Island.[3] In August 1997 the southern calving front retreated by 5 km with no significant upstream thinning.[4]

Map of Northeastern Greenland.
View of the terminus of the Nioghalvfjerdsbrae glacier with the southwestern end of Hovgaard Island and Cape Adolf Jensen.

Since 1990 Greenland's longest persistent supraglacial stream runs on the glacier, 73 km long in 2011, 71 km in 2017. The width of the stream remains relatively constant over most of the length ranging from 20-35 m.[5]

See also

References

  1. ↑ Rignot E., Kanagaratnam P. (2006). "Changes in the velocity structure of the Greenland Ice Sheet". Science. 311 (5763): 986–990. doi:10.1126/science.1121381. PMID 16484490.
  2. ↑ "Nioghalvfjerdsfjorden". Mapcarta. Retrieved 16 June 2016.
  3. ↑ Wilson N. J. (2015). "Water exchange between the continental shelf and the cavity beneath Nioghalvfjerdsbrae (79 North Glacier)". Geophysical Research Letters. 42 (18): 7648–7654. doi:10.1002/2015GL064944.
  4. ↑ Sustained mass loss of the northeast Greenland ice sheet triggered by regional warming
  5. ↑ Mauri Pelto (27 June 2018). "Nioghalvfjerdsbræ 70 km+ Long Supraglacial stream, Greenland's Longest?".


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