firn

firn
/fearn/, n.
névé.
[1850-55; < G (Swiss), n. use of firn last year's, old; c. OE fyrn former, ancient, Goth fairneis; akin to ON forn ancient. See BEFORE]

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(German: “of last year”),also called  Névé,  

      partially compacted granular snow that is the intermediate stage between snow and glacial ice. Firn is found under the snow that accumulates at the head of a glacier. It is formed under the pressure of overlying snow by the processes of compaction, recrystallization, localized melting, and the crushing of individual snowflakes. This process is thought to take a period of about one year. Annual layers of firn may often be detected by thin films of dust or ash that accumulate on the surface during each summer.

      Further compaction of firn, usually at a depth of 45 to 60 m (150 to 200 feet), results in glacial ice, distinguished by its impermeability to air and water. The density of firn is generally accepted as 0.4 to 0.84 grams per cubic cm, and its grain size ranges from 0.5 to 5 mm.

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Universalium. 2010.

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  • Firn — del Glaciar Cascada del Sur, 80x aumento. Firn o nieve firn es una nieve parcialmente compactada, un tipo de nieve que ha quedado de inviernos pasados y se ha recristalizado hasta formar una substancia más densa que la nieve fresca. Es hielo que… …   Wikipedia Español

  • firn — s. (geogr.) neveu. Trimis de siveco, 05.08.2004. Sursa: Sinonime  firn s. n. Trimis de siveco, 10.08.2004. Sursa: Dicţionar ortografic  FIRN n. Zăpadă granulară compactă, formată în regiunile muntoase şi cele polare ca rezultat al compactizării …   Dicționar Român

  • Firn — is partially compacted névé, a type of snow that has been left over from past seasons and has been recrystallized into a substance denser than névé. It is ice that is at an intermediate stage between snow and glacial ice. Firn has the appearance… …   Wikipedia

  • Firn — * Firn, adj. et adv. welches nur im Oberdeutschen üblich, im Hochdeutschen aber unbekannt ist, vorjährig, von dem vorigen Jahre. Firne Früchte, welche im vorigen Jahre gebauet worden. Firner Wein. Im firnen (vorigen) Jahre. Von dem Firnen essen,… …   Grammatisch-kritisches Wörterbuch der Hochdeutschen Mundart

  • firn — s.m.inv. TS meteor., geogr. neve allo stato granulare | massa nevosa che forma il bacino di alimentazione dei ghiacciai {{line}} {{/line}} DATA: 1892. ETIMO: dal ted. Firn, da firn vecchio di (almeno) un anno …   Dizionario italiano

  • firn — consolidated snow, the raw material of glaciers, 1853, lit. last year s snow, névé, from Ger. Firn, from Swiss dial. firn of last year, from M.H.G. virne old, from O.H.G. firni, related to O.E. fyrn old, Goth. fairns of last year, from P.Gmc.… …   Etymology dictionary

  • firn — [firn] n. [Ger < firn, of last year, old, akin to OE fyrn, former < IE base * per , beyond > FAR, FIRST] the granular snow, not in a completely compacted mass, that accumulates at the top of a glacier …   English World dictionary

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  • firn — firn; firn·ifi·ca·tion; …   English syllables

  • Firn — Firn, die körnige Schneemasse; daher Firne, die Spitzen der Alpen, welche mit ewigem Schnee bedeckt sind …   Pierer's Universal-Lexikon

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