Recent air and ground temperature increases at Tarfala Research Station, Sweden

Polar research

Martial Duguay¹  Regine Hock²  Ulf Jonsell³ 

[1] Geophysical InstituteUniversity of Alaska, Fairbanks, AK 99775, USA;Department of Earth Sciences, Uppsala University, SE-75236 Uppsala, Sweden;Department of Earth Sciences, Uppsala University, SE-75236 Uppsala, SwedenCorrespondence;Department of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91 Stockholm, Sweden

关键词: Air temperature;    climate change;    permafrost;    lapse rate;    degree-days;    NAO;   

DOI  :  10.3402/polar.v32i0.19807

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

Long-term data records are essential to detect and understand environmental change, in particular in generally data-sparse high-latitude and high-altitude regions. Here, we analyse a 47-year air temperature record (1965–2011) at Tarfala Research Station (67° 54.7′N, 18° 36.7′E, 1135 m a.s.l.) in northern Sweden, and a nearby 11-year record of 100-m-deep ground temperature (2001–11; 1540 m a.s.l.). The air temperature record shows a mean annual air temperature of −3.5±0.9°C (±1 standard deviation σ) and a linear warming trend of ±0.042°C yr−1. The warming trend shows large month-to-month variations with the largest trend in January followed by October. Also, the number of days with positive mean daily temperatures and positive degree-day sums has increased during the last two decades compared to the previous period. Temperature lapse rates derived from the mean daily Tarfala record and an air temperature record at the borehole site average 4.5°C km−1 and tend to be higher in summer than in winter. Mean sum...

【 授权许可】

CC BY-NC