Barnes Ice Cap
| Barnes Ice Cap | ||
|---|---|---|
 Satellite image of the ice cap |
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| location | Baffin Island in Nunavut (Canada) | |
| Type | icecap | |
| length | 150 km | |
| surface | 6000 km² | |
| Altitude range | 1120 m - 500 m | |
| Ice thickness | Max. 500 m | |
| Coordinates | 70 ° 0 ′ N , 73 ° 30 ′ W | |
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As Barnes Ice Cap or Barnes Ice Cap one is ice cap in northeastern Canada on Baffin Iceland referred. It covers an area of 6000 km², but has been losing altitude at an accelerated rate for some time. Between 2004 and 2006 alone, the loss in height was 1.0 ± 0.14 m per year. Between 1970 and 1984 this value was 0.12 m per year. From 1984 to 2006 it had already risen to 0.776 ± 0.35 m. This is related to the increased time that the ice melts each year. While this time was 65.6 ± 6 days from 1979 to 1987, it rose to 87.1 ± 7.8 days by the end of the measurement period from 2002 to 2010. In March 2011, a ten-day investigation of the ice field took place, which until then had mainly been measured by satellite. The share of such ice caps in sea level rise has been studied for several years. Over the past 5000 years, the average summer temperature had dropped by 2.7 ° C. It turned out that in the summer of 2013, the highest melting rate in 44,000 years was reached.
The Barnes Ice Cap is one of the oldest ice relics of the last glacial period and is more than 20,000 years old, and it is also one of the ten largest in Canada.
literature
- Kurt A. Refsnider, Gifford H. Miller, Marilyn L. Fogel, Bianca Fréchette, Roxane Bowden, John T. Andrews, G. Lang Farmer: Subglacially precipitated carbonates record geochemical interactions and pollen preservation at the base of the Laurentide Ice Sheet on central Baffin Island, eastern Canadian Arctic . In: Quaternary Research Vol. 81, No. 1, January 2014, pp. 94-105.
Remarks
- ^ A b Brian Hanson: Thermal response of a small ice cap to climatic forcing . In: Journal of Glaciology Vol. 36, No. 122, 1990, pp. 49-56.
- ^ A b William Sneed, Roger Hooke, Gordon Hamilton: Thinning of the south dome of Barnes Ice Cap, Arctic Canada, over the past two decades . In: GeoScienceWorld Vol. 36, No. 1, 2008, pp. 71-74.
- ↑ Florent Dupont, Alain Royer, Alexandre Langlois, Alicia Gressent, Ghislain Picard, Michel Fily, Patrick Cliche, Miroslav Chum: Monitoring the melt season length of the Barnes Ice Cap over the 1979-2010 period using active and passive microwave remote sensing data . In: Hydrological Processes Vol. 26, No. 17, 2012, pp. 2643-2652
- ^ Gifford H. Miller, Scott J. Lehman, Kurt A. Refsnider, John R. Southon, Yafang Zhong: Unprecedented recent summer warmth in Arctic Canada . In: Geophysical Research Letters Vol. 40, No. 21, 2013, pp. 5745-5751.
- ↑ Canada's oldest ice formation melting at alarming rate, scientists say , CanWest News Service, January 9, 2008.