TERMIUM Plus®

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MEDIUM-TEMPERATURE GRADIENT METAMORPHISM [1 record]

Record 1 2008-10-30

English

Subject field(s)
  • Atmospheric, Climatic and Meteorological Phenomena
CONT

Faceting is a metamorphic process occurring in a dry snowpack with a strong temperature gradient where takes place development of facets and eventually formation of depth hoar under higher temperature gradient.

OBS

Faceting involves the formation of facets and depth hoar whereas the French term "métamorphose de moyen gradient" refers to the formation of facets only.

OBS

medium gradient metamorphism: This term seems to be uncommon. In English, the authors generally make no distinction between a medium and a strong temperature gradient. In fact, the temperature gradient is usually described as whether weak or strong.

Key term(s)
  • medium-temperature gradient metamorphism
  • metamorphism of medium gradient
  • facetting

French

Domaine(s)
  • Phénomènes météorologiques, climatiques et atmosphériques
DEF

Métamorphose de neige sèche commandée par un gradient moyen (0,1<G<0,2 °C/cm) [et qui] aboutit à la formation de grains à faces planes.

OBS

Les métamorphoses de la neige sèche. [...] Pendant ou après une chute de neige, le vent casse les parties fragiles des cristaux. Il transforme donc les cristaux de neige fraîche en particules reconnaissables, voire en grains fins. [...] Le devenir des particules reconnaissables va dépendre de la valeur du gradient de température de la couche concernée : - par faible gradient, elles vont se transformer en grains fins; - par moyen gradient, elles vont se transformer en grains à faces planes; - par fort gradient, elles se transformeront en grains à faces planes (passage intermédiaire obligé) puis en gobelets. Ces transformations sont irréversibles : il n'y a pas de retour en arrière possible.

Spanish

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