Lilleøren, K.S., Etzelmüller, B., Schuler, T.V., Gisnås, K. and Humlum, O. 2012. The relative age of mountain permafrost – estimation of Holocene permafrost limits in Norway. Global and Planetary Change 92-93: 209-223.
In the words of Lilleøren et al. (2012), “we reconstructed temperature series of both Northern and Southern Norway based on numerous studies in Scandinavia examining pollen and plant macrofossils in lake sediment cores (e.g. Rosen et al., 2001; Seppa and Birks, 2001, 2002; Davis et al., 2003; Bjune et al., 2004; Nesje et al., 2005; Jensen and Vorren, 2008), chironomids in sediment cores (Rosen et al., 2001; Seppa and Birks, 2001; Korhola et al., 2002), tree line changes (Dahl and Nesje, 1996; Vorren et al., 1999; Seppa et al., 2002), and deposition rate of speleothems (Lauritzen, 1996; Lauritzen and Lundberg, 1999).” (more…)