Bukkehåmmårtjørna
| Bukkehåmmårtjørna | |
|---|---|
| Location | eastern Jotunheimen |
| Basin countries | Norway |
| Surface elevation | 1594 m |
Bukkehåmmårtjørna is a small lake in eastern Jotunheimen. This is the highest lake that has been investigated as a climate archive in southern Norway, being situated 1594 m above sea level.
A small glacier, Bukkehåmmårbreen, is draining meltwater into the lake at present. This glacier reformed just short of 6,000 years ago following the Holocene climate optimum and has existed continuously since. After growing gradually towards 4,000 years before present (BP) the glacier has been of near present size over the last 4,000 years, growing slightly larger over the last 2-2,500 years.[1] Prior to the climate optimum and following the deglaciation the glacier melted some 10,000 years before present.
The flat valley-shoulder that the lake is eroded into is locally known as a "fly". This particular level at about 1600 m a.s.l. and is believed to have been formed between 100 and 85 million years ago during the Cretaceous period.[2] Standing on the shore-line of Bukkehåmmårtjørna thus means that you are standing on the remnants of a landscape that the Dinosaurs ruled.
The small lake existed prior to the Last Glacial Maximum since it contains organic material older than 30,000 years old.[3] Currently being reassessed, growing evidence now indicates that much of the landscape that can be seen from this site is practically unchanged since the age of the Mammoth who lived on the wide plateaus more than 40,000 years ago.
The view from the lake, or higher up on the mountain-peak Høgdebrotet therefore includes a view into the landscapes of the distant past, including the landscape of the dinosaurs, the pre-ice age landscape, the landscape of the Mammoth during the last glacial period. By squinting your eyes and imagining the present forest-limit below, located some 300 m higher than at present and by imagining the glaciers of Leirungsalpene being absent you can also see the landscape as it was 7,000 years ago.
References
- ↑ Lie et al. (2004): Quaternary Science Reviews 23 1925–1945
- ↑ Lidmar-Bergsström K. et al. (2000): Global and Planetary Change 24, 211–231)
- ↑ Lie and Sandvold (1997): unpublished master thesis)
