Christer Jonasson

TL;DR: Callaghan et al. as discussed by the authors showed that the Swedish sub-Arctic has reached a level at which statistical analysis shows for the first time that current warming has exceeded that in the late 1930' s and early 1940' s, and has significantly crossed the 0 degrees C mean annual temperature threshold which causes many cryospheric and ecological impacts.

TL;DR: In this article, the authors used repeat photography, dendrochronological analysis, field observations along elevational transects and historical documents to study tree line dynamics in a sub-Arctic model area at different temporal and spatial scales.

TL;DR: A unique geo-referenced record of environmental and ecosystem observations from the area since 1913 is presented, which is of immediate relevance to local stakeholders who need to adapt to new opportunities and to respond to challenges.

TL;DR: Although this study was unable to identify the causes for the change in shrubs and small trees, they are consistent with anticipated changes due to climate change and reduced herbivory.

TL;DR: In this paper, the authors attributed accelerated decay of discontinuous permafrost at the Stordalen Mire in northern Sweden to increased temperature and snow depth, and caused expansion of wet minerotrop...