Continous, Discontinous and Sporadic permafrost and July 10 C Isotherm with Sea Ice Extent.
Map: Arto Vitikka, Arctic Centre, University of Lapland.
Sources for permafrost and sea ice data: National Snow and Ice Data Center.
July 10 C isotherm from USGS (2023).
You may use the map freely provided that the sources and credits are mentioned.
Map is done with QGIS software.