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This review presents a synthesis of four decades of palsa studies based on field experiments and observations mainly in Fennoscandia, as well as laboratory measurements. Palsas are peat-covered mounds with a permanently frozen core; in Finnish Lapland, they range from 0.5 to 7m in height and from 2 to 150m in diameter. These small landforms are characteristic of the southern margin of the discontinuous...
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