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单词 palsa
释义
palsa

Geology and Earth Sciences
  • Mound or ridge, largely made from peat, containing a perennial ice lens, and found in the damper sites of bogs in periglacial areas. Widths are in the range 10–30 m, lengths 15–150 m, and heights 1–7 m. Probably palsas are a result of heaving associated with the growth of segregated ice. See also pingo.


Geography
  • ‘There is no general agreement about the meaning of the word “palsa”. Usage and recent suggested definitions indicate that the word is chiefly used for cryogenic mounds covered by peat that were formed by an accumulation of segregation ice in the discontinuous permafrost zone’ (Pissart (2002) PPG 26, 4). However, Arlen-Pouliot and Bhiry (2005) The Holocene 15, 3, 408 are comfortable with this term.


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