Karaktäristiken hos strukturmarken på olika altitud i Abiskoområdet – en koppling till klimat och komplex systemteori
Subarctic and alpine areas are sensitive to climatic change when they lie at the margin of permafrost occurrence. Patterned ground in such areas is generated from an interplay among different mechanisms such as temperature, hydrology, soil texture, snow cower and vegetation. The aim of this study is...
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Uppsala universitet, Kulturgeografiska institutionen
2014
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ftuppsalauniv:oai:DiVA.org:uu-225355 2023-05-15T12:59:29+02:00 Karaktäristiken hos strukturmarken på olika altitud i Abiskoområdet – en koppling till klimat och komplex systemteori Scharin, Gunnar 2014 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-225355 swe swe Uppsala universitet, Kulturgeografiska institutionen Uppsala : Kulturgeografiska institutionen, Uppsala universitet http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-225355 urn:isbn:978-91-506-2404-5 info:eu-repo/semantics/openAccess Abisko patterned ground permafrost non-sorted circles altitude self-generation Licentiate thesis, monograph info:eu-repo/semantics/masterThesis text 2014 ftuppsalauniv 2023-02-23T21:41:39Z Subarctic and alpine areas are sensitive to climatic change when they lie at the margin of permafrost occurrence. Patterned ground in such areas is generated from an interplay among different mechanisms such as temperature, hydrology, soil texture, snow cower and vegetation. The aim of this study is to describe the connection between patterned ground characteristics and altitude and to evaluate the impact different variables have on the appearance of patterned ground. To understand these interactions is a discussion of self-organization processes, threshold effects and feedback mechanisms essential. In this investigation, characteristics of patterned ground are examined along an elevation gradient in the Abisko area in Northern Sweden. The study is limited to formations that are categorized into non-sorted circles on flat ground. To detect significant correlations between the characteristics of patterned ground and altitude nine places between 400 and 1400 m above sea level with at least 100 m difference in altitudes were investigated. These sites were categorized into six ridges and three sinks to evaluate the importance of topography. Non-sorted circles have less dwarf shrub, more moss-lichen cover and more cryptogam crust than surrounding ground. Outside the formations the amount of dwarf shrub decreases and the moss-lichen cover increases above 1000 m above sea level. At the highest altitude also a cryptogam crust is occurring around non sorted circles. Significant correlations exist between declining ground temperature and altitude, declining distance between non-sorted circles and altitude, and less dwarf shrub vegetation on non-sorted circles and altitude. These relationships are expected and can be connected to cryoturbation and abiotic stress. Shorter distance between formations can be linked to increased abiotic stress and less coverage soil stabilizing dwarf shrub vegetation. Formations are larger in sinks than ridges and surrounded by less dwarf shrub and more moss-lichen vegetation. This difference ... Master Thesis Abisko Northern Sweden permafrost Subarctic Uppsala University: Publications (DiVA) Abisko ENVELOPE(18.829,18.829,68.349,68.349) |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
Swedish |
topic |
Abisko patterned ground permafrost non-sorted circles altitude self-generation |
spellingShingle |
Abisko patterned ground permafrost non-sorted circles altitude self-generation Scharin, Gunnar Karaktäristiken hos strukturmarken på olika altitud i Abiskoområdet – en koppling till klimat och komplex systemteori |
topic_facet |
Abisko patterned ground permafrost non-sorted circles altitude self-generation |
description |
Subarctic and alpine areas are sensitive to climatic change when they lie at the margin of permafrost occurrence. Patterned ground in such areas is generated from an interplay among different mechanisms such as temperature, hydrology, soil texture, snow cower and vegetation. The aim of this study is to describe the connection between patterned ground characteristics and altitude and to evaluate the impact different variables have on the appearance of patterned ground. To understand these interactions is a discussion of self-organization processes, threshold effects and feedback mechanisms essential. In this investigation, characteristics of patterned ground are examined along an elevation gradient in the Abisko area in Northern Sweden. The study is limited to formations that are categorized into non-sorted circles on flat ground. To detect significant correlations between the characteristics of patterned ground and altitude nine places between 400 and 1400 m above sea level with at least 100 m difference in altitudes were investigated. These sites were categorized into six ridges and three sinks to evaluate the importance of topography. Non-sorted circles have less dwarf shrub, more moss-lichen cover and more cryptogam crust than surrounding ground. Outside the formations the amount of dwarf shrub decreases and the moss-lichen cover increases above 1000 m above sea level. At the highest altitude also a cryptogam crust is occurring around non sorted circles. Significant correlations exist between declining ground temperature and altitude, declining distance between non-sorted circles and altitude, and less dwarf shrub vegetation on non-sorted circles and altitude. These relationships are expected and can be connected to cryoturbation and abiotic stress. Shorter distance between formations can be linked to increased abiotic stress and less coverage soil stabilizing dwarf shrub vegetation. Formations are larger in sinks than ridges and surrounded by less dwarf shrub and more moss-lichen vegetation. This difference ... |
format |
Master Thesis |
author |
Scharin, Gunnar |
author_facet |
Scharin, Gunnar |
author_sort |
Scharin, Gunnar |
title |
Karaktäristiken hos strukturmarken på olika altitud i Abiskoområdet – en koppling till klimat och komplex systemteori |
title_short |
Karaktäristiken hos strukturmarken på olika altitud i Abiskoområdet – en koppling till klimat och komplex systemteori |
title_full |
Karaktäristiken hos strukturmarken på olika altitud i Abiskoområdet – en koppling till klimat och komplex systemteori |
title_fullStr |
Karaktäristiken hos strukturmarken på olika altitud i Abiskoområdet – en koppling till klimat och komplex systemteori |
title_full_unstemmed |
Karaktäristiken hos strukturmarken på olika altitud i Abiskoområdet – en koppling till klimat och komplex systemteori |
title_sort |
karaktäristiken hos strukturmarken på olika altitud i abiskoområdet – en koppling till klimat och komplex systemteori |
publisher |
Uppsala universitet, Kulturgeografiska institutionen |
publishDate |
2014 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-225355 |
long_lat |
ENVELOPE(18.829,18.829,68.349,68.349) |
geographic |
Abisko |
geographic_facet |
Abisko |
genre |
Abisko Northern Sweden permafrost Subarctic |
genre_facet |
Abisko Northern Sweden permafrost Subarctic |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-225355 urn:isbn:978-91-506-2404-5 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766023495668465664 |