Margareta Johansson
Forskare
Past and present permafrost temperatures in the Abisko area: redrilling of boreholes.
Författare
Summary, in English
Monitoring of permafrost has been ongoing since 1978 in the Abisko area, northernmost Sweden, when measurements of active layer thickness started. In 1980, boreholes were drilled in three mires in the area to record permafrost temperatures. Recordings were made twice per year, and the last data were obtained in 2002. During the International Polar Year (2007-2008), new boreholes were drilled within the 'Back to the Future' (BTF) and 'Thermal State of Permafrost' (TSP) projects that enabled year-round temperature monitoring. Mean annual ground temperatures (MAGT) in the mires are close to 0 degrees C, ranging from -0.16 to -0.47 degrees C at 5 m depth. Data from the boreholes show increasing ground temperatures in the upper and lower part by 0.4 to 1 degree C between 1980 and 2002. At one mire, permafrost thickness has decreased from 15 m in 1980 to ca. 9 m in 2009, with an accelerating thawing trend during the last decade.
Avdelning/ar
- Institutionen för naturgeografi och ekosystemvetenskap
- MERGE: ModElling the Regional and Global Earth system
Publiceringsår
2011
Språk
Engelska
Sidor
558-565
Publikation/Tidskrift/Serie
Ambio: a Journal of Human Environment
Volym
40
Issue
6
Dokumenttyp
Artikel i tidskrift
Förlag
Springer
Ämne
- Physical Geography
Nyckelord
- Ground temperatures
- Boreholes
- Permafrost
- Abisko
- Sub-arctic Sweden
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0044-7447