Articles | Volume 13, issue 2
Research article
28 Feb 2019
Research article |  | 28 Feb 2019

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

Olli Karjalainen, Miska Luoto, Juha Aalto, and Jan Hjort

Data sets

Very high resolution interpolated climate surfaces for global land areas ( R. J. Hijmans, S. E. Cameron, J. L. Parra, P. G. Jones, and A. Jarvis

Development of a 50-year high-resolution global dataset of meteorological forcings for land surface ( J. Sheffield, G. Goteti, and E. F. Wood

SoilGrids250m - global gridded soil information based on machine learning ( T. Hengl, J. Mendes de Jesus, G. B. M. Heuvelink, M. Ruiperez Gonzalez, M. Kilibarda, A. Blagotic, W. Shangguan, M. N. Wright, X. Geng, B. Bauer-Marschallinger, M. Antonio Guevara, R. Vargas, R. A. MacMillan, N. H. Batjes, J. G. B. Leenaars, E. Ribeiro, I. Wheeler, S. Mantel, and B. Kempen

MOD13A2 MODIS/Terra Vegetation Indices 16-Day L3 Global 1 km SIN Grid V006 K. Didan

Shuttle Radar Topography Mission, 30 Arc Second Scene SRTM_GTOPO_u30_mosaic United States Geological Survey

Short summary
Using a statistical modelling framework, we examined the environmental factors controlling ground thermal regimes inside and outside the Northern Hemisphere permafrost domain. We found that climatic factors were paramount in both regions, but with varying relative importance and effect size. The relationships were often non-linear, especially in permafrost conditions. Our results suggest that these non-linearities should be accounted for in future ground thermal models at the hemisphere scale.