Fróðskaparrit - 01.01.2002, Page 95

Fróðskaparrit - 01.01.2002, Page 95
93 Arctic Mountain Meteorology at the Sornfelli Mountain in Year 2000 in the Faroe Islands Arktiska Fjallaveðrið í 2000 á Sornfelli Hanne Hvidtfeldt Christiansen1 and Lis Elinborg Mortensen2 1: Geografisk Institutt, Universitetet i Oslo, Postboks 1042 Blindern, 0316 Oslo, Norway email: hhcl @unis.no 2: Jarðfrøðisavnið, Faroese Geological Survey, Brekkutun 1, Box 3169, 110 Tórshavn, Faroe Islánds email: lismor@jfs.fo Úrtak Umgirdar av Norðuratlantsstreyminum eru Føroyar eitt fyrimyndarligt landaøki til kanningar av veðurlags- broytingum elvdar av broytingum í Norðuratlants- streyminum. Afturat hesum gevur føroyska fjallalendið møguleika til at kanna, hvussu veðrið broytist við hædd- ini. Tætt við sjóvarmálan hava Føroyar miðalheitt veð- urlag, sum við hæddini uml 200 m omanfyri sjóvarmál- an gerst arktiskt. Fyri at byrja innsavningina av dátu um- boðandi fjallaveðri 300m yvir sjóvarmálan varð tann fyrsta fjallaveðurstøðin uppsett á Sornfelli í 1999 722 m omanfyri sjóvarmálan. Sornfelli veðurstøðin byggir á nýskapandi tøkni har mátitólini í stutt tíðarskeið verða lyft út úr einum hitaðum sylindara, sum annars verjir tey móti vindi og frosti. Støðin er sjálvvirkin og kann røkk- ast og stýrast við mótaldi. Veðurstøðin á Sornfelli hevur eydnast væl og hevur rokkið 95% dátuskiftisavkasti í ár 2000. Árligi miðalhitin í 2000 á Sornfelli var l.71°C. Árliga miðalvindferðin var 6.5 m/s. Ráðandi vindæltir- nar vóru útsynningur, landsynningur og norðan. Hita- fallið við hæddini frá sjóvarmálanum til Sornfelli var -0.0077°C/m. Abstract Surrounded by the North Atlantic Drift the terrestrial environment of Faroe Islands is an ideal place to study climatic changes caused by oscillations in the North At- lantic Drift. The high relief of the Faroes enables the study of the altitudinal climate gradient. Close to sea level the climate is cool temperate or subarctic, grading into a low arctic climate around 200 m asl. To initiate collection of data representing the mountain meteorolo- gy the first meteorological station above 300 m asl was established at the Sornfelli mountain measuring at 722 m asl in 1999. The Sornfelli meteorological station is based on innovative technology with the instruments only periodically exposed from a heated cylinder, pro- tecting them from strong winds and icing conditions. The station is operated automatically with modem ac- cess. The Sornfelli meteorological station has proved successfull achieving 95% data coverage in 2000. Mean annual air temperature (MAAT) in 2000 at Sornfelli was 1.71 °C. Mean annual wind speed was 6.5 m/s. Domi- nating wind directions were from southwest, southeast and north. The annual mean lapse rate between Sornfel- li and the coast was -0.0077°C/m. Fróðskapan it 50. bók 2002: 93-110
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