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56 years of solifluction measurements in the Abisko Mountains, northern Sweden: analysis of spatial and temporal variations of slow soil surface movements
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Department of Physical Geography and Ecosystems Analysis, Lund University, Sweden.
Quaternary Geology and Climate group, Geological Survey of Norway; Department of Geography, Trondheim & Norwegian University of Science and Technology, Norway.
Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Social and Economic Geography.
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2009 (English)In: Geografiska Annaler. Series A, Physical Geography, ISSN 0435-3676, E-ISSN 1468-0459, Vol. 91, no 3, 215-232 p.Article in journal (Refereed) Published
Abstract [en]

Solifluction movement rates from 1952 to 2008 for the Abisko region, northern Sweden, have been compiled and analysed through correlation   tests and multiple regression. The temporal analysis is based on two   datasets (Lobe11 & gridAB and Line B) from Karkevagge. The dataset   Lobe11 & gridAB show a strong correlation between movement rates and   mean annual air temperature (MAAT) and MAAT is also identified as one   of the significant contributing parameters in the multiple regression   model. No significant correlations were found for the Line B dataset.   The spatial analysis indicates generally higher movement rates in the   western part of the region and at lower altitudes mainly between 700   and 900 m a.s.l., but the spatial variability is high. To reduce the   influence of the temporal variation the data for the correlation tests   of the spatial variations were divided into two parts: 1957 to 1980 and   1981 to 2008. The correlation analysis of the dataset 1957 to 1980   shows a significant negative correlation between annual average   movement rates and permafrost probability and altitude. The dataset   1981 to 2008 shows a positive correlation between movement rates and   wetness index. It is concluded that movement rates may increase with   higher MAAT in the western part of the region (Karkevagge), the spatial   variability of movement rates within the region is very high and that   altitude (and/or permafrost) together with wetness index are the main   controls on the regional spatial variation. The study highlights the   limitations in establishing statistical relationships between movement   rates and climate using data from different field empirical studies.

Place, publisher, year, edition, pages
2009. Vol. 91, no 3, 215-232 p.
Keyword [en]
long-term measurement, solifluction movement, Abisko
National Category
Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Physical Geography
Identifiers
URN: urn:nbn:se:uu:diva-102085DOI: 10.1111/j.1468-0459.2009.00365.xISI: 000269868300005OAI: oai:DiVA.org:uu-102085DiVA: diva2:214155
Available from: 2009-05-04 Created: 2009-05-04 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Spatial and Temporal Variations of Solifluction and Related Environmental Parameters in the Abisko Mountains, Northern Sweden
Open this publication in new window or tab >>Spatial and Temporal Variations of Solifluction and Related Environmental Parameters in the Abisko Mountains, Northern Sweden
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents an assessment of the variation in solifluction occurrence, morphometry and movement rates in the Abisko region, northern Sweden. Variations in movement rates are analyzed both on a regional and local scale. The main methodological contributions of this thesis have been to provide new techniques of analyzing spatial and temporal variations of solifluction in order to detect long term temporal trends and to regionalize the variations in movement rates. The spatial analysis is achieved by using a combination of field measurements, GIS and remote sensing techniques and statistical analysis. The results are presented in six papers, focusing on the morphometry of solifluction landforms (paper I), the occurrence of permafrost (paper II), the spatial and temporal variations of lobe front movement rates using aerial photographs (paper III), the temporal, regional and local spatial variations in movement rates (paper IV – VI) and statistical modelling of the occurrence of solifluction landforms and calculation of geomorphic work (paper V and VI).

The results show that, on a regional scale, vegetation patterns are a major control on the occurrence of turf-banked solifluction landforms, with high NDVI-values (vegetation) associated with the presence of forms. Elevation is also a major control on a regional scale with a decrease in lobe dimensions and movement rates with increased elevation. High soil moisture values are associated with larger landforms and increased movement rates. Movement rates are generally higher in the western part of the region and appear to increase with higher MAAT. Equally, geomorphic work is greatest in the western part of the region. The important controls on a local scale vary from site to site, but include vegetation, slope angle and soil moisture. The photo analysis indicates that annual movement rates of lobe fronts in Kärkevagge and Låktatjåkka valley over the period 1959-2000 ranges from not-detectable to 63mm/yr. The permafrost model shows probabilities >0.8 for permafrost at elevations above 1300 m a.s.l. in the western part of the region, decreasing to altitudes over 850 m a.s.l. in the eastern part of the region. Calculated geomorphic work suggests that solifluction is a significant denudational agent in the sub-Arctic mountains of northern Sweden, but less so than previously estimated.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 54 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 648
Series
Keyword
solifluction, movement rates, Abisko region, Geographical Information Systems, statistical modelling, geomorphic work, permafrost
National Category
Physical Geography
Research subject
Physical Geography
Identifiers
urn:nbn:se:uu:diva-101419 (URN)978-91-554-7538-3 (ISBN)
Public defence
2009-06-12, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2009-05-18 Created: 2009-04-27 Last updated: 2009-05-18Bibliographically approved

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Ridefelt, HannaBoelhouwers, Jan

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