East Northwall Firn
| East Northwall Firn | |
|---|---|
 The East Northwall Firn is below the word "glaciers" in this 2005 image. The circular depression to the left is the Grasberg mine, the world's largest gold mine. | |
  East Northwall Firn  East Northwall Firn | |
| Type | Mountain glacier |
| Location | Puncak Jaya, Sudirman Range, Central Papua province, Indonesia |
| Coordinates | 04°03′54.82″S 137°10′49.87″E / 4.0652278°S 137.1805194°E |
| Area | 0.11 km2 (0.042 sq mi) in November 2024[1] |
| Length | 406 m (1,332 ft)[1] for the central patch |
| Terminus | Rockfall |
| Status | Retreating |
 | |
The East Northwall Firn was a glacier on Mount Carstensz in the Sudirman Range on the island of New Guinea in Central Papua province, Indonesia. Situated at an elevation of approximately 4,750 metres (15,580 ft) 2.5 kilometres (1.6 mi) NNW of Puncak Jaya, the highest summit in Oceania. It broke up in three patches in or before 2017.[2]
Sometime between 1936 and 1962, a single Northwall Firn split into several separate glaciers, the largest being the East Northwall Firn and the West Northwall Firn. Research presented in 2004 of IKONOS satellite imagery of the New Guinean glaciers indicated that in the two years from 2000 to 2002, the East Northwall Firn had lost a further 4.5% of its surface area.[3] An expedition to the remaining glaciers on Puncak Jaya in 2010 discovered that the ice on the glaciers there is about 32 metres (105 ft) thick and thinning at a rate of 7 metres (23 ft) annually. At that rate, the remaining glaciers in the immediate region near Puncak Jaya were expected to last only to the year 2015.[4][5] Indeed, in or before 2017, the West Northwall Firn had completely disappeared and the eastern Firn had broken up in three small patches.[2]
The East Northwall Firn glaciers are remnants of an icecap that in 1850 measured about 20 km2 (7.7 sq mi) and had developed approximately 5,000 years ago. At least one previous icecap also existed in the region between 15,000 and 7,000 years ago.[3]
| Patch | Area | Length |
|---|---|---|
| West | 0.02 km2 (0.0077 sq mi) | 261 m (856 ft) |
| Central | 0.06 km2 (0.023 sq mi) | 406 m (1,332 ft) |
| East | 0.03 km2 (0.012 sq mi) | 377 m (1,237 ft) |
See also
[edit]References
[edit]- ^ a b c measurement of glaciers on satellite view from November 18, 2024
- ^ a b Kathryn Hansen, Glaciers in the Tropics, but Not for Long, at NASA Earth Observatory, February 13, 2018
- ^ a b Kincaid, Joni L.; Andrew G Klein (2004). "Retreat of the Irian Jaya Glaciers from 2000 to 2002" (PDF). 61st Eastern Snow Conference. pp. 147–157. Archived from the original (pdf) on 2017-05-17. Retrieved 2011-11-03.
- ^ McDowell, Robin (July 1, 2010). "Indonesia's Last Glacier Will Melt 'Within Years'". Jakarta Globe. Retrieved 2011-11-03.
- ^ "Papua Glacier's Secrets Dripping Away: Scientists". Jakarta Globe. July 2, 2010. Retrieved 2011-11-03.
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