New insights into the environmental factors controlling the ground thermal regime across the Northern Hemisphere : a comparison between permafrost and non-permafrost areas

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dc.contributor.author Karjalainen, Olli
dc.contributor.author Luoto, Miska
dc.contributor.author Aalto, Juha
dc.contributor.author Hjort, Jan
dc.date.accessioned 2019-03-06T07:04:01Z
dc.date.available 2019-03-06T07:04:01Z
dc.date.issued 2019-02-28
dc.identifier.citation Karjalainen , O , Luoto , M , Aalto , J & Hjort , J 2019 , ' New insights into the environmental factors controlling the ground thermal regime across the Northern Hemisphere : a comparison between permafrost and non-permafrost areas ' , Cryosphere , vol. 13 , no. 2 , pp. 693-707 . https://doi.org/10.5194/tc-13-693-2019
dc.identifier.other PURE: 122829658
dc.identifier.other PURE UUID: c666c0cd-0e29-4a7e-9bf6-0e0121a6399f
dc.identifier.other ORCID: /0000-0001-6203-5143/work/55060066
dc.identifier.other ORCID: /0000-0001-6819-4911/work/55063183
dc.identifier.other WOS: 000459979600002
dc.identifier.other Scopus: 85062348531
dc.identifier.uri http://hdl.handle.net/10138/299882
dc.description.abstract The thermal state of permafrost affects Earth surface systems and human activity in the Arctic and has implications for global climate. Improved understanding of the local-scale variability in the global ground thermal regime is required to account for its sensitivity to changing climatic and geoecological conditions. Here, we statistically related observations of mean annual ground temperature (MAGT) and active-layer thickness (ALT) to high-resolution (similar to 1 km(2)) geospatial data of climatic and local environmental conditions across the Northern Hemisphere. The aim was to characterize the relative importance of key environmental factors and the magnitude and shape of their effects on MAGT and ALT. The multivariate models fitted well to both response variables with average R-2 values being similar to 0.94 and 0.78. Corresponding predictive performances in terms of root-mean-square error were similar to 1.31 degrees C and 87 cm. Freezing (FDD) and thawing (TDD) degree days were key factors for MAGT inside and outside the permafrost domain with average effect sizes of 6.7 and 13.6 degrees C, respectively. Soil properties had marginal effects on MAGT (effect size = 0.4-0.7 degrees C). For ALT, rainfall (effect size = 181 cm) and solar radiation (161 cm) were most influential. Analysis of variable importance further underlined the dominance of climate for MAGT and highlighted the role of solar radiation for ALT. Most response shapes for MAGT en
dc.format.extent 15
dc.language.iso eng
dc.relation.ispartof Cryosphere
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 1172 Environmental sciences
dc.subject ACTIVE-LAYER THICKNESS
dc.subject MOUNTAIN PERMAFROST
dc.subject SNOW COVER
dc.subject CLIMATE
dc.subject TEMPERATURES
dc.subject HEAT
dc.subject BASIN
dc.subject STATE
dc.title New insights into the environmental factors controlling the ground thermal regime across the Northern Hemisphere : a comparison between permafrost and non-permafrost areas en
dc.type Article
dc.contributor.organization Helsinki Institute of Sustainability Science (HELSUS)
dc.contributor.organization Department of Geosciences and Geography
dc.contributor.organization BioGeoClimate Modelling Lab
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.5194/tc-13-693-2019
dc.relation.issn 1994-0416
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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