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Lyngen Alps

Mountain range in Norway

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  • 5 chapters

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Through Glacier and Holocene

There are 140 glaciers in the mountains covering about 141 square kilometres (54 sq mi) of the Lyngen Peninsula at present. Gamvikblåisen and Strupenbreen are the two largest in the outer part of the peninsula, while in the interior Fornesbreen and the Jiehkkevárri glacial complex are the largest. The bedrock consists of a belt of ophiolitic gabbro that is flanked on both sides by predominantly schistose metasediments. The gabbro belt underlies the rugged mountains of Lyngsalpene. In the lowland areas between Oteren and Koppangen, amphibolites, greenstones, and greenshales predominate. In the lowlands on the eastern side of the Lyngen peninsula, mica schists, phyllites, and dolomites are mainly found. The lowlands on the western side are mainly composed of mica schists and a small amount of quartzites. Except for ice caps at the summits of Jiehkkevárri and Bálggesvárri, cirque glaciers dominate the present glaciation on the Lyngen Peninsula. The Lyngen Alps are sufficiently high as to give rain shadow in the interior lowland areas east of the mountains. The northward heat advection of air and water masses into the Norwegian Sea region produces some of the largest temperature anomalies in the world, with a mean January air temperature about 24 °C warmer in Tromsø than the latitudinal mean.

The Lyngen Alps Landscape Reserve (Norwegian: Lyngsalpan landskapsvernområde) was established by the King of Norway on 20 February 2004 to protect one of Norway's characteristic mountain areas, which includes glaciers, moraines, valleys, and geological deposits, with biodiversity, cultural monuments, and cultural influences that characterize the landscape. The protection of natural resources within the landscape reserve is also important for the Saami culture and economy, and the site must be suitable for reindeer herding. Haakon, Crown Prince of Norway took part in the opening of the landscape reserve on May 22, 2004. The area of the Lyngen Alps landscape reserve is 961.2 square kilometres (371.1 sq mi). The nature reserve extends over four municipalities in Troms county.

There is a public transport connection between Tromsø and Lyngen via express boat to Nord-Lenangen and several bus routes. There are also ferries connecting Svensby and Breivikeidet, as well as the villages of Olderdalen and Lyngseidet. One of the main tourist attractions of Lyngen Alps is the glacier-fed lake Blåvatnet with a distinct turquoise color, located in Strupskardet valley.

Blåvatnet

The proglacial lake Blåvatnet is located in the northern part of the Lyngen Peninsula in Strupskardet valley. The lake lies next to Nordre Jægervasstinden and Lenangstinden mountains and below the Eastern and Western Lenangsbreene glaciers. Strupskardelva river flows in Strupskardet valley towards the west via a chain of six glacial lakes including Blåvatnet, providing additional meltwater source to the lake. The lake Blåvatnet is surrounded to the North by two marginal latero-frontal push moraines, formed by advancing glaciers during the Younger Dryas 12,800–11,500 years before present and to the East by three moraines formed during the early Holocene 8,900–10,400 years before present. They consist of large angular boulders with diameters of 1–5 m. These moraines were formed by ice from the east and west Lenensbreen glaciers, with areas of 1.4 km2 and 0.7 km2 respectively. The Lenangsbreene glaciers reached the modern-day shoreline located around 4 km below the Blåvatnet around 20,000 years before present. The modern-day area of Lenangsbreene glaciers is 1.9 km2, while during the Lateglacial period 18,000–20,000 years before present was 9.1 km2, and the sea-level was 87 m higher than nowadays. During 3,800–8,800 years before present the Lenangsbreene glaciers were completely melted away. Blåvatnet is capturing upstream sediments for the glacier-meltwater streams.

Glaciofluvial outwash is forming a prograding delta at the head of the lake and provides suspended sediment which refracts light as an intense turquoise color, giving Blåvatnet (the Blue Lake) its name. Clear water in non-glacial lakes absorbs longer wavelengths of visible light and strongly reflects shorter blue and blue-green wavelengths, therefore, it appears blue due to Rayleigh scattering. The glacial flour in glacial waters provides stronger light reflection and makes the water opaque and bright. The glacial flour composition includes clay which is approximately 2-4 microns in diameter and silt which is around 4-65 microns in diameter. The composition of glacial flour absorbs most of the blue light and reflects some blue and green. With the elimination of the colors absorbed by both the glacial flour and the water itself, what is left is mostly green and some blue light reflected back off the glacial flour.

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