or details about the
Within ICOS Sweden the Abisko-Stordalen mire site is the northernmost site. The
site represents a subtype of sub-arctic wetlands, characterized by palsas.
The site has been subject of carbon cycle research since the 1970’ties and
being located very close to the 0°C isotherm it represents a very dynamic
part of the sub-arctic region.
This site is operated by the
Swedish Polar Research Secretariat
Abisko Scientific Research Station
Within ICOS Abisko-Stordalen is an ecosystem station. The site specific principal investigator is
University of Copenhagen.
The Abisko-Stordalen measurement site (lat. 68°21'N, lon. 19°03'E) is
located within the sporadic permafrost zone along the 0°C isotherm at
360 m above sea level, adjacent to lake Torneträsk. A large portion of the
mire consists of a slightly elevated drained area, altered by wetter
depressions, which are not underplayed by permafrost.
Geology and Soil
Peat depth is 1-3 m and permafrost is usually found at depths below 0.5-1 m.
The soil is organic, with 99% organic matter content. There are three
different main types of surface structures: dwarf shrub-dominated hummocks,
dominated hollows, and Eriophorum
Depending on soil water content and microtopography, the plant community structure and
composition varies between different classes typical of ombrotrophic
conditions: Dry ombrotrophic parts are dominated by Empetrum
, Vaccinium vitis-idaea
and Rubus chamaemorus
semi-wet ombrotrophic parts by Carex rotundata
; and wet minerotrophic areas by Eriophorum angustifolium
The annual mean temperature in Abisko region is –0.14°C and the mean
annual accumulated precipitation is 332 mm (data period 1981-2010), with
increasing temperatures over the last
decades. The low amount of precipitation has profound
effects on the palsa features found on the mire. The length of the vegetation
period (daily mean temp. of >0.4°C) is slightly longer than three months.
Besides standard ICOS measurements the research station also operates
O flux measurements.