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METAMORPHOSE FORT GRADIENT [1 record]
Record 1 - internal organization data 2008-09-25
Record 1, English
Record 1, Subject field(s)
- Atmospheric, Climatic and Meteorological Phenomena
Record 1, Main entry term, English
- faceting
1, record 1, English, faceting
correct, see observation, generic
Record 1, Abbreviations, English
Record 1, Synonyms, English
- kinetic growth 2, record 1, English, kinetic%20growth
correct, see observation, generic
- temperature gradient metamorphism 3, record 1, English, temperature%20gradient%20metamorphism
correct, see observation, obsolete, generic
- high temperature gradient metamorphism 4, record 1, English, high%20temperature%20gradient%20metamorphism
correct, see observation
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
Depth hoar is the result of high temperature gradient metamorphism (Marbouty, 1980) and consists of large faceted crystals, with at least some of them cup-shaped and hollow. The density of this type was always <0.25. Faceted crystals are produced by metamorphism of lower temperature gradient, and usually form in snow with density >0.25, that is too high to allow depth hoar formation. 4, record 1, English, - faceting
Record number: 1, Textual support number: 1 OBS
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. 5, record 1, English, - faceting
Record number: 1, Textual support number: 2 OBS
In French, the authors use the term "métamorphose de gradient moyen" when they refer to the metamorphic process leading to the formation of facets and they use the term "métamorphose de fort gradient" when the facets, under higher temperature gradient, develop into depth hoars. 5, record 1, English, - faceting
Record number: 1, Textual support number: 3 OBS
Temperature gradient metamorphism (TG): An older term [still in use] to describe the faceting or squaring process driven by strong temperature gradients. Currently the terms kinetic growth or faceting are preferred. 1, record 1, English, - faceting
Record 1, Key term(s)
- facetting
Record 1, French
Record 1, Domaine(s)
- Phénomènes météorologiques, climatiques et atmosphériques
Record 1, Main entry term, French
- métamorphose de fort gradient
1, record 1, French, m%C3%A9tamorphose%20de%20fort%20gradient
correct, feminine noun, specific
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 DEF
Métamorphose de neige sèche commandée par un gradient fort (G>0,2 °C/cm) [et qui] est responsable de la formation de gobelets. 1, record 1, French, - m%C3%A9tamorphose%20de%20fort%20gradient
Record number: 1, Textual support number: 1 CONT
La métamorphose de fort gradient (G>20 °C/m). Dans ce cas, la différence de température entre les grains suivant la verticale est très marquée, et les flux de vapeur sont plus intenses. Le premier stade de transformation se caractérise par l'apparition rapide de grains à faces planes accompagnée d'un tassement notable pour ce qui concerne la neige récente [...] Dans sa forme finale, le grain prend généralement une forme pyramidale striée très caractéristique, communément appelée «gobelet» ou givre de profondeur [...] 1, record 1, French, - m%C3%A9tamorphose%20de%20fort%20gradient
Record number: 1, Textual support number: 1 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. 2, record 1, French, - m%C3%A9tamorphose%20de%20fort%20gradient
Record 1, Spanish
Record 1, Textual support, Spanish
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