from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mound similar to pingo but much smaller size.
Sample result: risk of total loss of palsa mires estimated to be 80% by 2100 under scenario A1B.
Glacial activity has had a major influence on the development of the landscape including notable geological features such as deep canyons or kursu valleys with nearly vertical walls over 100 m in height cut by melt water, sandurs (outwash plains), boulder hollows, tundra polygons, U-valleys, glacial cirques and moraines, talus accumulations, drumlins, weathering phenomena and palsa bogs.
Freeze-thaw processes play a key role in the development and maintenance of these peatlands by shaping the surface of the landscape, and the types that are exclusive to the Arctic - most notably polygon mires and palsa mires - are associated with permafrost.
Need to do some downscaling to get useful results to input to an impact model to make decisions about adaptation. (here’s an early paper from this work) 14: 20: Next up isStefanFronzek’s talk onProbabilistic projections of climate change effects on sub-arctic palsa mires, in which I learnt that palsa mires are permanently frozen peat hummocks, which are sensitive to climate change, and if they melt are a major source of methane.
Permafrost, however, exists in (very northern) Finland not only in palsa bogs and peat hummocks (=”pounu” in Finnish) but also on some fjeld top areas (=”paljakka” in Finnish).