Jökull


Jökull - 01.12.2006, Page 32

Jökull - 01.12.2006, Page 32
Y. Wang and M. J. Wooller STUDY SITES A total of four lake sites were visited during February 27th through March 7th of 2004: Lake Litla-Viðarvatn on the Melrakkaslétta peninsula, Lake Torfadalsvatn on the Skagi peninsula, Lake Stífluvatn on the Trölla- skagi Peninsula and Lake Arnarvatn stóra in the in- terior of Iceland (Figure 2). Lake Litla-Viðarvatn (66◦14’25.4”N, 15◦48’17.1”W, 148 meters a.s.l. has a catchment area of ∼5 km2 and the lake size it- self is 0.1 km2. It is a shallow lake with a maxi- mum depth of ∼3 m. A stream flows into the north end of the lake and an outlet stream flows from the south end. Grasses, herbs and mosses were present in the surrounding vegetation during our visit. Lake Torfadalsvatn (66◦03’46.3”N, 20◦23’01.6"W, 47 m a.s.l.) has a catchment area of ∼4 km2 with the to- tal lake area of ∼0.4 km2. The maximum depth of Lake Torfadalsvatn is 5 m. A stream enters at its southern end and an outflow is present towards the north end of the lake (Rundgren, 1998). The lake is surrounded by a rocky plateau with scattered dwarf shrubs (Rundgren, 1998). During our visit, the shore- line was covered by lichens, mosses, sedges, heather, and grasses. Aquatic plants are present during sum- mer (Axford, personal communication). Lake Stíflu- vatn (65◦59’10.0”N, 19◦00’15.9”W, 135 m a.s.l.) is located on the Tröllaskagi Peninsula and is dammed at its north end with the Skeiðfoss hydroelectric power station. This lake has a catchment area of 115 km2 and an area of 4 km2. Three paleo-lakes, which were originally 2 m deep each, were flooded by the current dammed lake that is now 10 m deep. Its catchment area includes a few lakes and brooks and its discharge, Fljótaá, is connected with Lake Miklavatn. Steep mountains are to the west side of the lake and land- slides were evident in this area. Herbs were present in the surrounding vegetation. Lake Arnarvatn stóra (64◦57’22.6”N, 20◦21’28.8”W) was the highest ele- vation lake (∼476 m a.s.l.) visited and is located ∼40 km northwest from Langjökull icecap in Iceland’s in- terior. The surrounding topography is relatively flat with the catchment area ∼61 km2. The lake area is ∼4 km2 with a maximum depth of ∼2.5 m. River Austurá discharges into the north end of the lake and a short river Skammá enters the lake from southeast. The surrounding vegetation composition includes grasses, herbs, lichens and mosses. Figure 2. Map of Iceland and sampling sites: (1) Lake Torfa- dalsvatn, (2) Lake Stífluvatn, (3) Lake Litla-Viðarvatn, and (4) Lake Arnarvatn stóra. – Setkjarn- ar voru teknir úr Torfadalsvatni (1), Stífluvatni (2), Litla-Viðar- vatni (3) og Arnarvatni stóra (4). 30 JÖKULL No. 56
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