Recent air and ground temperature increases at Tarfala Research Station, Sweden
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,...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Norwegian Polar Institute
2013-07-01
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| Series: | Polar Research |
| Subjects: | |
| Online Access: | http://www.polarresearch.net/index.php/polar/article/download/19807/pdf_1 |
| _version_ | 1818526871618322432 |
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| author | Ulf Jonsell Regine Hock Martial Duguay |
| author_facet | Ulf Jonsell Regine Hock Martial Duguay |
| author_sort | Ulf Jonsell |
| collection | DOAJ |
| description | 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 summer air temperatures at Tarfala explain 76% of the variance of the summer glacier mass balance of nearby Storglaciären. Consistent with the observed increase in Tarfala's air temperature, the ground temperature record shows significant permafrost warming with the largest trend (0.047°C yr−1) found at 20 m depth. |
| first_indexed | 2024-12-11T06:28:51Z |
| format | Article |
| id | doaj.art-63e389012ed64e3dbeffe7e2c77a6686 |
| institution | Directory Open Access Journal |
| issn | 0800-0395 1751-8369 |
| language | English |
| last_indexed | 2024-12-11T06:28:51Z |
| publishDate | 2013-07-01 |
| publisher | Norwegian Polar Institute |
| record_format | Article |
| series | Polar Research |
| spelling | doaj.art-63e389012ed64e3dbeffe7e2c77a66862022-12-22T01:17:35ZengNorwegian Polar InstitutePolar Research0800-03951751-83692013-07-0132011110.3402/polar.v32i0.19807Recent air and ground temperature increases at Tarfala Research Station, SwedenUlf JonsellRegine HockMartial DuguayLong-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 summer air temperatures at Tarfala explain 76% of the variance of the summer glacier mass balance of nearby Storglaciären. Consistent with the observed increase in Tarfala's air temperature, the ground temperature record shows significant permafrost warming with the largest trend (0.047°C yr−1) found at 20 m depth.www.polarresearch.net/index.php/polar/article/download/19807/pdf_1Air temperatureclimate changepermafrostlapse ratedegree-daysNAO |
| spellingShingle | Ulf Jonsell Regine Hock Martial Duguay Recent air and ground temperature increases at Tarfala Research Station, Sweden Polar Research Air temperature climate change permafrost lapse rate degree-days NAO |
| title | Recent air and ground temperature increases at Tarfala Research Station, Sweden |
| title_full | Recent air and ground temperature increases at Tarfala Research Station, Sweden |
| title_fullStr | Recent air and ground temperature increases at Tarfala Research Station, Sweden |
| title_full_unstemmed | Recent air and ground temperature increases at Tarfala Research Station, Sweden |
| title_short | Recent air and ground temperature increases at Tarfala Research Station, Sweden |
| title_sort | recent air and ground temperature increases at tarfala research station sweden |
| topic | Air temperature climate change permafrost lapse rate degree-days NAO |
| url | http://www.polarresearch.net/index.php/polar/article/download/19807/pdf_1 |
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