Periglacial processes and landform2

Periglacial processes and landform2 - Periglacial processes...

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Periglacial processes and landforms Periglacial originally defined as the zone peripheral to glaciers now defined as near-glacial in the sense of either location or conditions: o perennially frozen ground (permafrost) o seasonally-thawed ground (active layer) o incomplete vegetation cover of herbaceous plants and dwarf trees o ground is snow free for part of the year o frequent fluctuations of air temperature across 0 o C Permafrost ground with a temperature perennially below 0 o C by definition does not require the presence of ice for example, there is dry permafrost in northeast Greenland (Perryland) and parts of Antarctica however, water is usually present when ground freezes and thus ice is usually associated with permafrost pore or interstitial ice o ice that forms in pore spaces and fractures and cements the soil matrix o forms as freezing plane descends into the ground without displacing soil segregated ground ice o bodies of pure ice (lenses, veins, wedges) that form as liquid water and vapour are
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Periglacial processes and landform2 - Periglacial processes...

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