The Tarfala research station (Swedish : Tarfala forskningstation) is a field station of Stockholm University. The station is situated in the Tarfala Valley in northern Sweden. It specializes in glacial, periglacial and climatological research.
It was here at Storglaciären that the first glacier mass balance program was initiated immediately after World War II. This glaciological program is continued to present day and thus constitutes the longest continuous study of this type in the world. In 1976, the first systematic studies on mountain permafrost in Scandinavia were started using Tarfala research station as main research base. Several years of field measurements proved, that Tarfala research station is located in a zone of widespread discontinuous permafrost. Today, Tarfala research station is a well known research place for studies on glaciers, mountain climate, periglacial geomorphology and alpine vegetation.
The station is situated in the Tarfala Valley in Swedish Lapland at an elevation of 1135 meters, and about 150 kilometres north of the Arctic Circle. The station is ideally located at the foot of Kebnekaise, the highest mountain in Sweden. The station is surrounded by several glaciers. The largest are Storglaciären, Isfallsglaciären, Kebnepakteglaciären and Tarfalaglaciären. [1]
Hans Wilhelmsson Ahlmann, a well-known Swedish geographer and glaciologist, was a leading personality with expeditions to Svalbard, Iceland and Greenland already in the 1930s. After World War II, he suggested regular studies also of the glaciers in the Kebnekaise area. Valter Schytt and other glaciologists proposed Storglaciären at Tarfala as ideal location for long-term glacier mass balance studies. Regular glaciological measurements started already in 1946, with a gauging station downstream of Storglaciären. [2]
Valter Schytt remained the leading personality and promoted the development of the research station until his death in 1985. [3] The number of station buildings gradually increased and annual university courses at Tarfala Research Station could start in 1959. Tarfala Research station was officially opened as a research station of Stockholms University in 1961 and expanded by four buildings through a grant from the Wallenberg Foundation. A sauna, a laboratory, a lecture hall and additional living quarters were added in the following years. Winter storm destroyed some buildings in 1975, 1985 and 1993; spring slush avalanches damaged the laboratory hut in 1982 and again in 1991. The damaged buildings were repaired or reconstructed during the following summers.
Research was focused on glaciology, hydrology and climate. The good location inmidst of glaciers and lakes, and the increasingly good infrastructure of the research station attracted scientists from other Swedish universities. The long-term station director Valter Schytt always welcomed scientists and students from abroad, too. In 1985, Valter Schytt passed away in Tarfala valley during a winter visit. In 1995/96, fifty years of research activities in Tarfala were celebrated and Per Holmlund is appointed as director for Tarfala Research Station.
Systematic climatological measurements at Tarfala station exist since 1961 and are continued till today. [ when? ]
Climate data for Tarfala 1991–2020 (1144 m) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
Record high °C (°F) | 8.2 (46.8) | 6.0 (42.8) | 9.1 (48.4) | 10.8 (51.4) | 15.7 (60.3) | 18.8 (65.8) | 23.6 (74.5) | 21.2 (70.2) | 17.7 (63.9) | 13.7 (56.7) | 10.3 (50.5) | 8.0 (46.4) | 23.6 (74.5) |
Mean daily maximum °C (°F) | −6.8 (19.8) | −7.2 (19.0) | −6.3 (20.7) | −2.5 (27.5) | 1.9 (35.4) | 6.9 (44.4) | 11.2 (52.2) | 9.5 (49.1) | 5.0 (41.0) | −0.6 (30.9) | −3.5 (25.7) | −5.5 (22.1) | 0.2 (32.3) |
Daily mean °C (°F) | −10.2 (13.6) | −10.5 (13.1) | −9.2 (15.4) | −6.0 (21.2) | −1.3 (29.7) | 3.8 (38.8) | 8.0 (46.4) | 6.7 (44.1) | 2.3 (36.1) | −3.3 (26.1) | −6.7 (19.9) | −8.7 (16.3) | −2.9 (26.7) |
Mean daily minimum °C (°F) | −14.0 (6.8) | −14.3 (6.3) | −12.9 (8.8) | −9.5 (14.9) | −4.4 (24.1) | 1.0 (33.8) | 4.9 (40.8) | 4.3 (39.7) | 0.2 (32.4) | −5.9 (21.4) | −10.0 (14.0) | −12.2 (10.0) | −6.1 (21.1) |
Record low °C (°F) | −31.9 (−25.4) | −32.8 (−27.0) | −25.0 (−13.0) | −20.7 (−5.3) | −18.4 (−1.1) | −9.2 (15.4) | −2.8 (27.0) | −5.2 (22.6) | −11.0 (12.2) | −19.0 (−2.2) | −25.0 (−13.0) | −25.4 (−13.7) | −32.8 (−27.0) |
Source 1: SMHI [4] | |||||||||||||
Source 2: NOAA [5] |
Climate data for Tarfala, 1961–2011 | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
Mean daily maximum °C (°F) | −8.3 (17.1) | −8.0 (17.6) | −7.5 (18.5) | −3.9 (25.0) | 1.1 (34.0) | 6.5 (43.7) | 9.9 (49.8) | 8.5 (47.3) | 3.8 (38.8) | −1.4 (29.5) | −5.4 (22.3) | −7.4 (18.7) | −1.0 (30.2) |
Daily mean °C (°F) | −11.8 (10.8) | −11.3 (11.7) | −10.6 (12.9) | −7.5 (18.5) | −1.9 (28.6) | 3.2 (37.8) | 6.4 (43.5) | 5.3 (41.5) | 0.8 (33.4) | −3.9 (25.0) | −7.9 (17.8) | −10.7 (12.7) | −4.6 (23.7) |
Mean daily minimum °C (°F) | −15.3 (4.5) | −14.6 (5.7) | −13.7 (7.3) | −11.1 (12.0) | −5.0 (23.0) | −0.1 (31.8) | 2.9 (37.2) | 2.1 (35.8) | −2.2 (28.0) | −6.4 (20.5) | −10.3 (13.5) | −14.0 (6.8) | −8.2 (17.2) |
Source: [6] |
The valley is sometimes hit by katabatic winds, which can generate very high wind speeds. The Swedish record of measured wind speed is from Tarfala research station with 81 m/s (290 km/h) on 20 December 1992.
The mass balance of a glacier is the difference between accumulation and ablation (sublimation and melting). A glacier with a sustained negative balance is out of equilibrium and will retreat, while one with a sustained positive balance is out of equilibrium and will advance. The determination of the mass balance requires time consuming field work. The winter mass balance is taken in the end of winter by measuring and probing snowpack depth in snow pits at the accumulation zone. Thus the past winters residual snowpack is analysed by its depth and density. In the ablation zone, ablation measurements are made using stakes inserted vertically into the glacier, usually at the end of the previous melt season. At the end of the melt (ablation) season, the length of stake exposed by melting ice is measured. Most stakes must be replaced each year. Mass balance results have been regularly published by Schytt [7] and Holmlund. [8]
The climate in the Tarfala valley is quite continental, compared with the regions west of the Kebnekaise; the climate in western Norway is maritime. This steep climatic gradient influences also both the net balance gradients on glaciers and the glaciation level. The average annual precipitation is about 1000 mm at Tarfala Research Station. This is less than half of the precipitation in the Norwegian mountains to the west. The mean annual air temperature at the equilibrium line at about 1500 m a.s.l. is about -6 °C.
Regular glaciological measurements at Storglaciären were started in 1946. [2] In 1968, a new gauging station was built, and the International Hydrological Decade (IHD) spawned its hydrological activities also in the Tarfala valley. Today, the glacier mass balance program at Storglaciären is globally known as one of the most important glaciological records and supplies important data to climate change questions in subarctic mountain regions. [9] [10] [11]
Whereas permafrost occurrences in palsa bogs were well known already in the beginning of the 20th century [12] and many permafrost studies were done on Spitzbergen, it was doubted until the early 1980s that mountain permafrost is present in the Scandinavian mountains. Its widespread existence at Tarfala could be proved in 1976 with refraction seismic soundings. It was demonstrated clearly, that Tarfala valley belongs to the region of discontinuous mountain permafrost. The active layer thickness on protalus ramparts and other wind exposed ridges was up to two meters. [13] Four years of systematic permafrost research in the Tarfala valley followed during the years 1977 till 1980, applying different geophysical methods (seismic and DC-geoelectrical soundings in summer, continuous measurements of the ground temperatures in boreholes to get the mean annual ground temperature). In March 1980, measurement of the basal temperature of the snow cover [14] and snow distribution were used to secure the findings. The field studies allowed to sketch a reliable picture of the permafrost distribution in the Kebnekaise region. Detailed results were published in 1982 and later on. [15]
The studies were enlarged to the areas north of Tarfala (Abisko region, Lyngen Peninsula in Norway). Additional studies covered the mountain ranges in the south of the Scandinavian mountain range (Jotunheimen, Rondane, Dovre). The resulting habilitation thesis was dedicated to the memory of Valter Schytt. [16] A summary of the results was printed in Geografiska Annaler. [17] Thus, Tarfala station is located inmidst of the discontinuous permafrost zone, with a MAAT of −3.5 °C (25.7 °F) at an elevation of 1,130 metres (3,710 ft). At 1,600 metres (5,200 ft) above sea level, the continuous permafrost zone will be reached.
Within the EU-sponsored project PACE (Permafrost and Climate in Europe), two boreholes in bedrock, 100 m and 15 m deep were drilled in March 2000. [18] The location is above the research station at an altitude of 1540 meters and near Tarfalaglaciären. The thermistor chain in the 100 m hole includes 30 thermistors. The depth of the Zero Annual Amplitude (ZAA) is 15 to 20 meters with a temperature of -3.2 °C in the year 2000. The ground temperature at a depth of 100 meters is -2.75 °C. The geothermal gradient of 1.17 °C /100 m allows to extrapolate a permafrost thickness of 330 meters, and thus confirms suggestions done with the results of earlier geoelectric soundings. [19]
Warming trend of the air temperatures due to climate change is reflected also in the ground temperatures. The geothermal gradient in the uppermost 50 meters hint to a significant temperature increase during at least 50 years. [20]
Sweden is a country in Northern Europe on the Scandinavian Peninsula. It borders Norway to the west ; Finland to the northeast; and the Baltic Sea and Gulf of Bothnia to the south and east. At 450,295 km2 (173,860 sq mi), Sweden is the largest country in Northern Europe, the fifth largest in Europe, and the 55th largest country in the world.
The Alpine region of Switzerland, conventionally referred to as the Swiss Alps, represents a major natural feature of the country and is, along with the Swiss Plateau and the Swiss portion of the Jura Mountains, one of its three main physiographic regions. The Swiss Alps extend over both the Western Alps and the Eastern Alps, encompassing an area sometimes called Central Alps. While the northern ranges from the Bernese Alps to the Appenzell Alps are entirely in Switzerland, the southern ranges from the Mont Blanc massif to the Bernina massif are shared with other countries such as France, Italy, Austria and Liechtenstein.
Glaciology is the scientific study of glaciers, or, more generally, ice and natural phenomena that involve ice.
Kebnekaise is the highest mountain in Sweden. The Kebnekaise massif, which is part of the Scandinavian mountain range, has two main peaks. The glaciated southern peak used to be the highest at 2,120 metres (6,960 ft) above sea level, but has shrunk by 24 meters during the last 50 years, making the northern icefree peak at 2,096.8 metres (6,879 ft) the highest. Kebnekaise lies in Swedish Lapland, about 150 kilometres (93 mi) north of the Arctic Circle and west of Kiruna near the Kungsleden hiking trail between Abisko and Hemavan.
Utsjoki is a municipality in Finland, the northernmost in the country. It is in Lapland and borders Norway as well as the municipality of Inari. The municipality was founded in 1876. It has a population of 1,136 (31 August 2024) and covers an area of 5,372.00 square kilometres (2,074.14 sq mi) of which 227.51 km2 (87.84 sq mi) is water. The population density is 0.22 inhabitants per square kilometre (0.57/sq mi).
Jotunheimen is a mountainous area of roughly 3,500 square kilometres (1,400 sq mi) in southern Norway and is part of the long range known as the Scandinavian Mountains. The 29 highest mountains in Norway are all located in the Jotunheimen mountains, including the 2,469-metre (8,100 ft) tall mountain Galdhøpiggen. The Jotunheimen mountains straddle the border between Innlandet and Vestland counties.
Sarek National Park is a national park in Jokkmokk Municipality, Lapland in northern Sweden. Established in 1909, the park is among the oldest national parks in Europe. It is adjacent to two other national parks, namely Stora Sjöfallet and Padjelanta. The shape of Sarek National Park is roughly circular with an average diameter of about 50 km (31.07 mi).
Rock glaciers are distinctive geomorphological landforms, consisting either of angular rock debris frozen in interstitial ice, former "true" glaciers overlain by a layer of talus, or something in-between. Rock glaciers are normally found at high latitudes and/or elevations, and may extend outward and downslope from talus cones, glaciers or terminal moraines of glaciers.
Crucial to the survival of a glacier is its mass balance of which surface mass balance (SMB), the difference between accumulation and ablation. Climate change may cause variations in both temperature and snowfall, causing changes in the surface mass balance. Changes in mass balance control a glacier's long-term behavior and are the most sensitive climate indicators on a glacier. From 1980 to 2012 the mean cumulative mass loss of glaciers reporting mass balance to the World Glacier Monitoring Service is −16 m. This includes 23 consecutive years of negative mass balances.
The International Permafrost Association (IPA), founded in 1983, is an international professional body formed to foster the dissemination of knowledge concerning permafrost and to promote cooperation among individuals and national or international organisations engaged in scientific investigation and engineering work related to permafrost and seasonally frozen ground. The IPA became an Affiliated Organisation of the International Union of Geological Sciences in July 1989.
The Abisko Scientific Research Station (ANS) is a field research station managed by the Swedish Polar Research Secretariat. Situated on the south shore of Lake Torneträsk, it lies at the edge of the Abisko National Park. The station conducts ecological, geological, geomorphological and meteorological research in subarctic environments and each year about 500 scientists visit from all over the world. The varied geological, topographical and climatic conditions of the area allow it to be inhabited by a range of flora and fauna. These features, which have caused the area to be given National Park status, also make it an important place for scientific research, particularly of alpine and subalpine ecosystems.
Kebnekaise mountain lodge, elevation 690 metres (2,260 ft), is situated at the base of Mount Kebnekaise, 19 kilometres (12 mi) west of Nikkaluokta, which in turn is situated 66 kilometres (41 mi) west of Kiruna in Lappland, Sweden. The lodge is owned and managed by the Swedish Tourist Association (STF).
Nikkaluokta is a Swedish Sami village in Norrbotten County. The village belongs to Gällivare Municipality, bordering Kiruna Municipality, the closest urban area some 60 kilometers away. In its vicinity lie the areas of two Sami communities, Laevas and Girjas, who still herd semi-domesticated reindeer in the region.
Mark Dyurgerov was an internationally known glaciologist and Fellow of the Institute of Arctic and Alpine Research (INSTAAR) of the University of Colorado at Boulder. He was born in Moscow, Russia; both of his parents were engineers, and his mother was also a Russian poet.
Juvvasshøi or Juvvasshøe is a mountain in Lom Municipality in Innlandet county, Norway. The 1,893-metre (6,211 ft) tall mountain is located in the Jotunheimen mountains just outside the border of Jotunheimen National Park. The mountain sits about 20 kilometres (12 mi) southwest of the village of Fossbergom and about 50 kilometres (31 mi) northeast of the village of Øvre Årdal. The mountain is surrounded by several other notable mountains including Store Lauvhøi to the northeast, Glittertinden to the east, Galdhøi and Galdhøpiggen to the southwest, and Storhøi to the northwest.
Storglaciären is a glacier in Tarfala Valley in the Scandinavian Mountains of Kiruna Municipality, Sweden. The glacier is classified as polythermal having both cold and warm bottom temperatures. It was on Storglaciären that the first glacier mass balance research program began, which continues to the present day; this is the longest continuous study of its type in the world. Storglaciären has had a cumulative negative mass balance of -17 m between 1946 and 2006. The program began monitoring the Rabots Glaciär in 1982, Riukojietna in 1985, and Mårmaglaciären in 1988. All three of these glaciers have had a strong negative mass balance since monitoring began.
The Scandinavian Mountains or the Scandes is a mountain range that runs through the Scandinavian Peninsula. The western sides of the mountains drop precipitously into the North Sea and Norwegian Sea, forming the fjords of Norway, whereas to the northeast they gradually curve towards Finland. To the north they form the border between Norway and Sweden, reaching 2,000 metres (6,600 ft) high at the Arctic Circle. The mountain range just touches northwesternmost Finland but are scarcely more than hills at their northernmost extension at the North Cape.
Matti Kullervo Seppälä was a Finnish geomorphologist specialized in cold climate aeolian processes.
Stig Valter Schytt was a Swedish glaciologist.
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