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TASSEMENT NEIGE [6 records]
Record 1 - internal organization data 2022-12-01
Record 1, English
Record 1, Subject field(s)
- Atmospheric, Climatic and Meteorological Phenomena
Record 1, Main entry term, English
- snow compaction
1, record 1, English, snow%20compaction
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- compaction of snow 2, record 1, English, compaction%20of%20snow
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
In the region below the surface, snow compaction is thought to occur in three stages. In the first stage near the surface, compaction occurs by grain growth and rearrangement due to grain boundary sliding. In the second stage, compaction occurs through increasing overburden pressure inducing creep deformation and sintering. In the final stage, interconnected pores have closed off, and further compaction is caused by air bubble compression. 3, record 1, English, - snow%20compaction
Record 1, French
Record 1, Domaine(s)
- Phénomènes météorologiques, climatiques et atmosphériques
Record 1, Main entry term, French
- tassement de la neige
1, record 1, French, tassement%20de%20la%20neige
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- compactage de la neige 2, record 1, French, compactage%20de%20la%20neige
masculine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
[...] avec le temps, le tassement de la neige sous son propre poids entraîne systématiquement une augmentation de la densité de la neige de surface. 3, record 1, French, - tassement%20de%20la%20neige
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 2009-01-09
Record 2, English
Record 2, Subject field(s)
- Atmospheric, Climatic and Meteorological Phenomena
Record 2, Main entry term, English
- settlement
1, record 2, English, settlement
correct, officially approved
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record number: 2, Textual support number: 1 DEF
... the slow deformation of the snow as it becomes denser and sags under the influence of gravity. 2, record 2, English, - settlement
Record number: 2, Textual support number: 1 CONT
Settlement of alpine snow ... Under the action of gravity, the weight of the snow presses on the individual grains below, causing settlement and generally resulting in densification and strengthening. 3, record 2, English, - settlement
Record number: 2, Textual support number: 2 CONT
Settlement in the surface layers is improving the bond between layers. [Example approved by the Avalanche Bulletin Terminology Standardization Committee.] 4, record 2, English, - settlement
Record number: 2, Textual support number: 1 OBS
Do not confuse with whumpf [which is the sound made by a collapsing snowpack due to an overload]. Settlement is a gradual process. 4, record 2, English, - settlement
Record number: 2, Textual support number: 2 OBS
settlement: term officially approved by the Avalanche Bulletin Terminology Standardization Committee. 5, record 2, English, - settlement
Record 2, French
Record 2, Domaine(s)
- Phénomènes météorologiques, climatiques et atmosphériques
Record 2, Main entry term, French
- tassement
1, record 2, French, tassement
correct, masculine noun, officially approved
Record 2, Abbreviations, French
Record 2, Synonyms, French
Record 2, Textual support, French
Record number: 2, Textual support number: 1 DEF
Diminution de l’épaisseur du manteau neigeux principalement en raison de la métamorphose de faible gradient. 2, record 2, French, - tassement
Record number: 2, Textual support number: 1 OBS
Il en résulte : augmentation de la densité et de la résistance de la neige. 2, record 2, French, - tassement
Record number: 2, Textual support number: 1 CONT
[...] plus l'intensité [de la chute de neige] diminue, plus la métamorphose et le tassement du manteau(donc sa consolidation) ont le temps de se réaliser; le risque [d’avalanche] s’en trouve alors diminué à terme plus ou moins long. 3, record 2, French, - tassement
Record number: 2, Textual support number: 2 CONT
Le tassement des couches de surface améliore les liaisons entre les couches. [Exemple entériné par le Comité d’uniformisation de la terminologie des bulletins d’avalanche.] 4, record 2, French, - tassement
Record number: 2, Textual support number: 2 OBS
tassement : terme uniformisé par le Comité d’uniformisation de la terminologie des bulletins d’avalanche. 5, record 2, French, - tassement
Record 2, Spanish
Record 2, Textual support, Spanish
Record 3 - internal organization data 2008-09-25
Record 3, English
Record 3, Subject field(s)
- Atmospheric, Climatic and Meteorological Phenomena
Record 3, Main entry term, English
- faceting
1, record 3, English, faceting
correct, see observation, generic
Record 3, Abbreviations, English
Record 3, Synonyms, English
- kinetic growth 2, record 3, English, kinetic%20growth
correct, see observation, generic
- temperature gradient metamorphism 3, record 3, English, temperature%20gradient%20metamorphism
correct, see observation, obsolete, generic
- high temperature gradient metamorphism 4, record 3, English, high%20temperature%20gradient%20metamorphism
correct, see observation
Record 3, Textual support, English
Record number: 3, 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 3, English, - faceting
Record number: 3, 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 3, English, - faceting
Record number: 3, 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 3, English, - faceting
Record number: 3, 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 3, English, - faceting
Record 3, Key term(s)
- facetting
Record 3, French
Record 3, Domaine(s)
- Phénomènes météorologiques, climatiques et atmosphériques
Record 3, Main entry term, French
- métamorphose de fort gradient
1, record 3, French, m%C3%A9tamorphose%20de%20fort%20gradient
correct, feminine noun, specific
Record 3, Abbreviations, French
Record 3, Synonyms, French
Record 3, Textual support, French
Record number: 3, 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 3, French, - m%C3%A9tamorphose%20de%20fort%20gradient
Record number: 3, 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 3, French, - m%C3%A9tamorphose%20de%20fort%20gradient
Record number: 3, 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 3, French, - m%C3%A9tamorphose%20de%20fort%20gradient
Record 3, Spanish
Record 3, Textual support, Spanish
Record 4 - internal organization data 2006-12-05
Record 4, English
Record 4, Subject field(s)
- Atmospheric, Climatic and Meteorological Phenomena
Record 4, Main entry term, English
- decomposing and fragmented particle
1, record 4, English, decomposing%20and%20fragmented%20particle
correct, see observation, officially approved
Record 4, Abbreviations, English
- DF 2, record 4, English, DF
correct, see observation, officially approved
Record 4, Synonyms, English
- DF particle 1, record 4, English, DF%20particle
correct, see observation, officially approved
- DF 2, record 4, English, DF
correct, see observation, officially approved
- DF 2, record 4, English, DF
- partly decomposed particle 3, record 4, English, partly%20decomposed%20particle
- partly decomposed grain 4, record 4, English, partly%20decomposed%20grain
- partly branched grain 5, record 4, English, partly%20branched%20grain
- partly settled grain 6, record 4, English, partly%20settled%20grain
see observation, obsolete
- partly settled particle 7, record 4, English, partly%20settled%20particle
see observation, obsolete
Record 4, Textual support, English
Record number: 4, Textual support number: 1 CONT
Decomposing and fragmented particles are those snow crystals that have in some way been changed from their original form. This change can be through mechanical action (such as with wind) or through natural processes such as rounding (in which a crystal loses its original form and its branches ... can become detached from the original crystal). Parts of the original crystal forms may still be discernible. Decomposing forms are often smaller than the original particles from which they formed. 8, record 4, English, - decomposing%20and%20fragmented%20particle
Record number: 4, Textual support number: 2 CONT
The warm temperatures have settled the snow into decomposing and fragmented particles. [Example approved by the Avalanche Bulletin Terminology Standardization Committee.] 7, record 4, English, - decomposing%20and%20fragmented%20particle
Record number: 4, Textual support number: 1 OBS
Symbol: / 2, record 4, English, - decomposing%20and%20fragmented%20particle
Record number: 4, Textual support number: 2 OBS
Data Code: DF 2, record 4, English, - decomposing%20and%20fragmented%20particle
Record number: 4, Textual support number: 3 OBS
decomposing and fragmented particle; DF particle: terms usually used in the plural (decomposing and fragmented particles; DF particles). 9, record 4, English, - decomposing%20and%20fragmented%20particle
Record number: 4, Textual support number: 4 OBS
The terms "partly settled grain" and "partly settled particle" are no longer used and are not recommended. 7, record 4, English, - decomposing%20and%20fragmented%20particle
Record number: 4, Textual support number: 5 OBS
decomposing and fragmented particles; DF; DF particles: terms and abbreviation officially approved by the Avalanche Bulletin Terminology Standardization Committee. 9, record 4, English, - decomposing%20and%20fragmented%20particle
Record 4, Key term(s)
- decomposing and fragmented particles
- DF particles
- partly settled particles
Record 4, French
Record 4, Domaine(s)
- Phénomènes météorologiques, climatiques et atmosphériques
Record 4, Main entry term, French
- particule reconnaissable
1, record 4, French, particule%20reconnaissable
correct, see observation, feminine noun, officially approved
Record 4, Abbreviations, French
Record 4, Synonyms, French
Record 4, Textual support, French
Record number: 4, Textual support number: 1 DEF
Grain altéré de neige rappelant encore la forme originelle du cristal dont il est issu. 2, record 4, French, - particule%20reconnaissable
Record number: 4, Textual support number: 1 CONT
Lors d’une chute de neige par température négative, les cristaux, souvent agglomérés en flocons, peuvent être soumis à l’action mécanique du vent qui a pour conséquence, comme montré plus haut, de briser plus ou moins, suivant sa vitesse, les structures dendritiques fragiles. Si les destructions ne sont pas très importantes, on peut encore voir de nombreuses formes originelles dendritiques et on ne parle plus de cristaux de neige fraîche (symbole : +) mais des particules reconnaissables (symbole = /). 2, record 4, French, - particule%20reconnaissable
Record number: 4, Textual support number: 2 CONT
Les températures douces ont entraîné le tassement de la neige et la transformation des cristaux en particules reconnaissables. [Exemple entériné par le Comité d’uniformisation de la terminologie des bulletins d’avalanche. ] 3, record 4, French, - particule%20reconnaissable
Record number: 4, Textual support number: 1 OBS
particule reconnaissable : terme fréquemment employé au pluriel. 4, record 4, French, - particule%20reconnaissable
Record number: 4, Textual support number: 2 OBS
particules reconnaissables : terme uniformisé par le Comité d’uniformisation de la terminologie des bulletins d’avalanche. 4, record 4, French, - particule%20reconnaissable
Record 4, Key term(s)
- particules reconnaissables
Record 4, Spanish
Record 4, Textual support, Spanish
Record 5 - internal organization data 2004-05-12
Record 5, English
Record 5, Subject field(s)
- Glaciology
Record 5, Main entry term, English
- firn field
1, record 5, English, firn%20field
correct
Record 5, Abbreviations, English
Record 5, Synonyms, English
- névé 1, record 5, English, n%C3%A9v%C3%A9
correct
- firn basin 1, record 5, English, firn%20basin
correct
Record 5, Textual support, English
Record number: 5, Textual support number: 1 DEF
The accumulation area or upper region of a glacier where snow accumulates and firn is secreted. 1, record 5, English, - firn%20field
Record 5, Key term(s)
- neve
Record 5, French
Record 5, Domaine(s)
- Glaciologie
Record 5, Main entry term, French
- névé
1, record 5, French, n%C3%A9v%C3%A9
correct, masculine noun
Record 5, Abbreviations, French
Record 5, Synonyms, French
Record 5, Textual support, French
Record number: 5, Textual support number: 1 DEF
Partie amont d’un glacier, ou zone d’accumulation, où la neige(évoluant par tassement et fusion partielle) se transforme en glace. 2, record 5, French, - n%C3%A9v%C3%A9
Record number: 5, Textual support number: 1 CONT
Il se constitue [...] des champs de neige persistante, les «névés»; par tassement et recristallisation, la neige devenant glace, on trouve dessous le glacier [...]. La neige des névés se transforme progressivement en une glace compacte où ne subsistent que de rares inclusions de bulles d’air et dont la densité est proche de celle de la glace pure(0, 91). 3, record 5, French, - n%C3%A9v%C3%A9
Record 5, Spanish
Record 5, Campo(s) temático(s)
- Glaciología
Record 5, Main entry term, Spanish
- nevero
1, record 5, Spanish, nevero
correct, masculine noun
Record 5, Abbreviations, Spanish
Record 5, Synonyms, Spanish
Record 5, Textual support, Spanish
Record number: 5, Textual support number: 1 DEF
Circo o cuenca de recepción de un glaciar donde se acumula la nieve, cuyos cristales, al fundirse parcialmente y compactarse, se convierten en hielo. 1, record 5, Spanish, - nevero
Record 6 - internal organization data 1979-11-22
Record 6, English
Record 6, Subject field(s)
- Climatology
- Polar Geography
Record 6, Main entry term, English
- unsintered snow 1, record 6, English, unsintered%20snow
Record 6, Abbreviations, English
Record 6, Synonyms, English
Record 6, Textual support, English
Record number: 6, Textual support number: 1 CONT
Loose-snow avalanches initiate in a surface layer that lacks cohesion, either in a layer of dry and unsintered snow or in a very wet layer. 1, record 6, English, - unsintered%20snow
Record number: 6, Textual support number: 1 OBS
to sinter: to become a coherent mass from heating without melting. 2, record 6, English, - unsintered%20snow
Record 6, French
Record 6, Domaine(s)
- Climatologie
- Géographie du froid
Record 6, Main entry term, French
- neige non tassée 1, record 6, French, neige%20non%20tass%C3%A9e
Record 6, Abbreviations, French
Record 6, Synonyms, French
Record 6, Textual support, French
Record number: 6, Textual support number: 1 OBS
Un réchauffement(...) diminue la résistance et la cohésion [du manteau neigeux](...). Un refroidissement(...) gêne la métamorphose de la neige et son tassement. 2, record 6, French, - neige%20non%20tass%C3%A9e
Record number: 6, Textual support number: 2 OBS
La cohésion(...) augmente avec le tassement naturel de la neige(...) 1, record 6, French, - neige%20non%20tass%C3%A9e
Record 6, Spanish
Record 6, Textual support, Spanish
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