Articles | Volume 13, issue 2
The Cryosphere, 13, 693–707, 2019
https://doi.org/10.5194/tc-13-693-2019
The Cryosphere, 13, 693–707, 2019
https://doi.org/10.5194/tc-13-693-2019

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 et al.

Data sets

Very high resolution interpolated climate surfaces for global land areas (https://worldclim.org/current) R. J. Hijmans, S. E. Cameron, J. L. Parra, P. G. Jones, and A. Jarvis https://doi.org/10.1002/joc.1276

Development of a 50-year high-resolution global dataset of meteorological forcings for land surface (http://hydrology.princeton.edu/data.pgf.php) J. Sheffield, G. Goteti, and E. F. Wood https://doi.org/10.1175/JCLI3790.1

SoilGrids250m - global gridded soil information based on machine learning (https://files.isric.org/soilgrids) 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 https://doi.org/10.1371/journal.pone.0169748

MOD13A2 MODIS/Terra Vegetation Indices 16-Day L3 Global 1 km SIN Grid V006 K. Didan https://doi.org/10.5067/MODIS/MOD13A2.006

Shuttle Radar Topography Mission, 30 Arc Second Scene SRTM_GTOPO_u30_mosaic United States Geological Survey http://glcf.umd.edu/data/srtm

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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.