TERMIUM Plus®
The Government of Canada’s terminology and linguistic data bank.
UNSTABLE ATMOSPHERE [9 records]
Record 1 - internal organization data 2023-02-23
Record 1, English
Record 1, Subject field(s)
- Atmospheric Physics
- Environmental Studies and Analyses
Record 1, Main entry term, English
- vertical atmospheric motion
1, record 1, English, vertical%20atmospheric%20motion
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- atmospheric vertical motion 2, record 1, English, atmospheric%20vertical%20motion
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
Vertical atmospheric motion. Most brief but violent disturbances in Earth's wind systems involve large areas of ascending and descending air.... a thunderstorm is said to develop when the atmosphere becomes "unstable to vertical motion[. "] Such an instability can arise whenever relatively warm, light air is overlain by cooler, heavier air. Under such conditions[, ] the cooler air tends to sink, displacing the warmer air upward. 1, record 1, English, - vertical%20atmospheric%20motion
Record 1, French
Record 1, Domaine(s)
- Physique de l'atmosphère
- Études et analyses environnementales
Record 1, Main entry term, French
- mouvement atmosphérique vertical
1, record 1, French, mouvement%20atmosph%C3%A9rique%20vertical
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- mouvement vertical atmosphérique 2, record 1, French, mouvement%20vertical%20atmosph%C3%A9rique
correct, masculine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 OBS
mouvement atmosphérique vertical; mouvement vertical atmosphérique : désignations habituellement utilisées au pluriel. 3, record 1, French, - mouvement%20atmosph%C3%A9rique%20vertical
Record 1, Key term(s)
- mouvements atmosphériques verticaux
- mouvements verticaux atmosphériques
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 2012-11-21
Record 2, English
Record 2, Subject field(s)
- Atmospheric Physics
Record 2, Main entry term, English
- non-convective state
1, record 2, English, non%2Dconvective%20state
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record number: 2, Textual support number: 1 CONT
stable : A non-convective state in the atmosphere, opposite of unstable. 1, record 2, English, - non%2Dconvective%20state
Record 2, French
Record 2, Domaine(s)
- Physique de l'atmosphère
Record 2, Main entry term, French
- état non convectif
1, record 2, French, %C3%A9tat%20non%20convectif
correct, masculine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
Record 2, Textual support, French
Record number: 2, Textual support number: 1 CONT
stable : État non convectif de l'atmosphère, opposé à «instable». 1, record 2, French, - %C3%A9tat%20non%20convectif
Record 2, Spanish
Record 2, Textual support, Spanish
Record 3 - internal organization data 2009-11-09
Record 3, English
Record 3, Subject field(s)
- Atomic Physics
Record 3, Main entry term, English
- spallation reaction
1, record 3, English, spallation%20reaction
correct
Record 3, Abbreviations, English
Record 3, Synonyms, English
Record 3, Textual support, English
Record number: 3, Textual support number: 1 DEF
The splitting of atoms in the upper atmosphere through the bombardment of cosmic rays. 1, record 3, English, - spallation%20reaction
Record number: 3, Textual support number: 1 OBS
This results in the formation of new, often unstable, isotopes. Spallation reactions occur in the upper atmosphere when cosmic rays hit gas molecules and also at the surface of the earth by direct cosmic ray irradiation of atoms in solid geological materials. 1, record 3, English, - spallation%20reaction
Record 3, French
Record 3, Domaine(s)
- Physique atomique
Record 3, Main entry term, French
- réaction de spallation
1, record 3, French, r%C3%A9action%20de%20spallation
correct, feminine noun
Record 3, Abbreviations, French
Record 3, Synonyms, French
Record 3, Textual support, French
Record number: 3, Textual support number: 1 DEF
Réaction nucléaire où les noyaux sont éclatés en particules. 2, record 3, French, - r%C3%A9action%20de%20spallation
Record 3, Spanish
Record 3, Textual support, Spanish
Record 4 - internal organization data 2005-04-25
Record 4, English
Record 4, Subject field(s)
- Atmospheric Physics
Record 4, Main entry term, English
- thermal stratification
1, record 4, English, thermal%20stratification
correct
Record 4, Abbreviations, English
Record 4, Synonyms, English
- thermal stratification of the atmosphere 2, record 4, English, thermal%20stratification%20of%20the%20atmosphere
correct
- atmospheric thermal stratification 3, record 4, English, atmospheric%20thermal%20stratification
correct
Record 4, Textual support, English
Record number: 4, Textual support number: 1 DEF
The layering of different temperatures of ... air caused by different densities, less dense floating on more dense layers. 4, record 4, English, - thermal%20stratification
Record number: 4, Textual support number: 1 CONT
Thermal stratification of the atmosphere is characteristic of the Nocturnal Boundary Layer (NBL), particularly in basin topography where surface cooling combines with drainage flows from competing sources to create a complex thermal structure that can play an important role in transport and diffusion of pollution. 5, record 4, English, - thermal%20stratification
Record number: 4, Textual support number: 2 CONT
Atmospheric stability describes the thermal stratification or vertical temperature structure of the atmosphere. Generally, six or seven different classes of atmospheric stability are used to describe the atmosphere. These classes range from extremely unstable(when atmospheric turbulence is greatest) to extremely stable(when atmospheric mixing is at a minimum and wind speeds are low). When the atmosphere is unstable, pollutants can rapidly diffuse through a large volume of the atmosphere. When the atmosphere is stable, pollutants will diffuse much more slowly in a vertical direction 6, record 4, English, - thermal%20stratification
Record number: 4, Textual support number: 1 PHR
Mean, stable, vertical thermal stratification of the atmosphere, 7, record 4, English, - thermal%20stratification
Record number: 4, Textual support number: 2 PHR
Lower, stable, unstable, weak, atmospheric thermal stratification. 7, record 4, English, - thermal%20stratification
Record 4, French
Record 4, Domaine(s)
- Physique de l'atmosphère
Record 4, Main entry term, French
- stratification thermique
1, record 4, French, stratification%20thermique
correct, feminine noun
Record 4, Abbreviations, French
Record 4, Synonyms, French
- stratification thermique de l'atmosphère 2, record 4, French, stratification%20thermique%20de%20l%27atmosph%C3%A8re
correct, feminine noun
- stratification thermique de l'air 3, record 4, French, stratification%20thermique%20de%20l%27air
correct, feminine noun
Record 4, Textual support, French
Record number: 4, Textual support number: 1 CONT
L'inversion de température [...] affecte les 50 premiers mètres de la troposphère. Avec la nuit, surtout en hiver, le sol se refroidit plus rapidement que les couches d'air. Au cours de la nuit les premières couches d'air vont peu à peu devenir plus froide que celle située au dessus, la stratification thermique (plus on monte, plus il fait froid) est donc inversée. 4, record 4, French, - stratification%20thermique
Record number: 4, Textual support number: 2 CONT
La stratification thermique de l'air est importante pour la compréhension de la dispersion des polluants. Si la température diminue de façon constante avec l'altitude, l'atmosphère est alors dite instable, le polluant se disperse davantage en hauteur. S'il se met en place une couche d'inversion, c'est à dire que la température augmente de nouveau en altitude, l'atmosphère est dite stable. Si le polluant est émis en dessous de cette limite d'inversion, dans la couche limite atmosphérique, le polluant sera bloqué dans sa progression verticale, tandis que s'il est émis au dessus, sa dispersion vers le sol sera bloquée. 5, record 4, French, - stratification%20thermique
Record number: 4, Textual support number: 3 CONT
Les échanges verticaux entre les différentes couches de l'atmosphère sont limités par la stratification thermique de l'atmosphère et par les différents régimes de vents. 2, record 4, French, - stratification%20thermique
Record number: 4, Textual support number: 1 PHR
Stratification thermique horizontale, instable, inverse, verticale. 6, record 4, French, - stratification%20thermique
Record 4, Spanish
Record 4, Textual support, Spanish
Record 5 - internal organization data 2004-10-29
Record 5, English
Record 5, Subject field(s)
- Atmospheric Physics
Record 5, Main entry term, English
- unstable air mass
1, record 5, English, unstable%20air%20mass
correct
Record 5, Abbreviations, English
Record 5, Synonyms, English
- unstable airmass 2, record 5, English, unstable%20airmass
correct
Record 5, Textual support, English
Record number: 5, Textual support number: 1 DEF
Air mass having static instability in its lower layers ... 3, record 5, English, - unstable%20air%20mass
Record number: 5, Textual support number: 1 CONT
If the airmass is unstable, air which is pushed upward by some force will continue upward. An unstable airmass usually contains relatively warm(usually moist) air near the earth's surface and relatively cold(usually dry) air in the mid and upper levels of the atmosphere. 4, record 5, English, - unstable%20air%20mass
Record number: 5, Textual support number: 1 OBS
unstable air mass: ... convective clouds and precipitation occur if its moisture content is sufficiently high. 3, record 5, English, - unstable%20air%20mass
Record 5, Key term(s)
- unstable air-mass
Record 5, French
Record 5, Domaine(s)
- Physique de l'atmosphère
Record 5, Main entry term, French
- masse d'air instable
1, record 5, French, masse%20d%27air%20instable
correct, feminine noun
Record 5, Abbreviations, French
Record 5, Synonyms, French
Record 5, Textual support, French
Record number: 5, Textual support number: 1 DEF
Masse d'air présentant de l'instabilité hydrostatique dans ses couches inférieures [...] 2, record 5, French, - masse%20d%27air%20instable
Record number: 5, Textual support number: 1 OBS
masse d'air instable : [...] des nuages convectifs et des précipitations se produisent si sa teneur en humidité est suffisamment élevée 2, record 5, French, - masse%20d%27air%20instable
Record 5, Spanish
Record 5, Campo(s) temático(s)
- Física de la atmósfera
Record 5, Main entry term, Spanish
- masa de aire inestable
1, record 5, Spanish, masa%20de%20aire%20inestable
feminine noun
Record 5, Abbreviations, Spanish
Record 5, Synonyms, Spanish
Record 5, Textual support, Spanish
Record number: 5, Textual support number: 1 DEF
Masa de aire que presenta inestabilidad hidrostática en las capas inferiores [...] 1, record 5, Spanish, - masa%20de%20aire%20inestable
Record number: 5, Textual support number: 1 OBS
masa de aire inestable: [...] se producen nubes convectivas y precipitaciones si el contenido de humedad es suficientemente alto. 1, record 5, Spanish, - masa%20de%20aire%20inestable
Record 6 - internal organization data 2002-11-04
Record 6, English
Record 6, Subject field(s)
- Chemical Elements and Compounds
- Pollutants
- Climate Change
Record 6, Main entry term, English
- halogenated compound
1, record 6, English, halogenated%20compound
correct
Record 6, Abbreviations, English
Record 6, Synonyms, English
Record 6, Textual support, English
Record number: 6, Textual support number: 1 CONT
The chemical agents implicated in the ozone depletion phenomena are the halogenated compounds known as "halocarbons. "Though stable in the lower atmosphere, scientists believe they become unstable in sunlight in the atmosphere, and react with ozone, forming new compounds, thereby depleting the ozone available for screening. 2, record 6, English, - halogenated%20compound
Record number: 6, Textual support number: 2 CONT
Measurements of concentration trends and sensitivity studies by means of radiation models have resolved that the strongest climatic change signals are to be expected from CFCl3 (F 11), FC2Cl[subscript 2 (F 12), CH4, N2O and O3. A number of other halogenated compounds and hydrocarbons altogether probably are less important than any one of the above mentioned constituents and will not be considered specifically in the present context. 3, record 6, English, - halogenated%20compound
Record 6, French
Record 6, Domaine(s)
- Éléments et composés chimiques
- Agents de pollution
- Changements climatiques
Record 6, Main entry term, French
- composé halogéné
1, record 6, French, compos%C3%A9%20halog%C3%A9n%C3%A9
correct, masculine noun
Record 6, Abbreviations, French
Record 6, Synonyms, French
Record 6, Textual support, French
Record number: 6, Textual support number: 1 DEF
[Composé] chimique qui renferme au moins un halogène. 2, record 6, French, - compos%C3%A9%20halog%C3%A9n%C3%A9
Record number: 6, Textual support number: 1 OBS
Les halogènes sont le fluor, le chlore, le brome, l'iode et l'astate; seuls les quatre premiers sont vraiment considérés dans le processus d'halogénation. Le chlore, parmi tous les halogènes, représente le produit le plus menaçant pour la couche d'ozone stratosphérique. 2, record 6, French, - compos%C3%A9%20halog%C3%A9n%C3%A9
Record 6, Spanish
Record 6, Campo(s) temático(s)
- Elementos y compuestos químicos
- Agentes contaminantes
- Cambio climático
Record 6, Main entry term, Spanish
- compuesto halogenado
1, record 6, Spanish, compuesto%20halogenado
correct, masculine noun
Record 6, Abbreviations, Spanish
Record 6, Synonyms, Spanish
Record 6, Textual support, Spanish
Record 7 - internal organization data 1992-12-31
Record 7, English
Record 7, Subject field(s)
- Air Pollution
Record 7, Main entry term, English
- lofting
1, record 7, English, lofting
correct
Record 7, Abbreviations, English
Record 7, Synonyms, English
Record 7, Textual support, English
Record number: 7, Textual support number: 1 DEF
A pollution plume with a flat base but appreciable vertical spread indicative of an atmosphere which is statically stable up to the base of the plume and unstable above. 1, record 7, English, - lofting
Record 7, French
Record 7, Domaine(s)
- Pollution de l'air
Record 7, Main entry term, French
- panache turgescent
1, record 7, French, panache%20turgescent
correct, masculine noun
Record 7, Abbreviations, French
Record 7, Synonyms, French
Record 7, Textual support, French
Record number: 7, Textual support number: 1 DEF
Panache de pollution à base plate mais d'extension verticale importante, qui indique une atmosphère statiquement stable jusqu'à la base du panache et instable au-dessus. 1, record 7, French, - panache%20turgescent
Record 7, Spanish
Record 7, Campo(s) temático(s)
- Contaminación del aire
Record 7, Main entry term, Spanish
- diseminación de contaminantes en altura
1, record 7, Spanish, diseminaci%C3%B3n%20de%20contaminantes%20en%20altura
feminine noun
Record 7, Abbreviations, Spanish
Record 7, Synonyms, Spanish
Record 7, Textual support, Spanish
Record number: 7, Textual support number: 1 DEF
Penacho de contaminación de base plana, pero de apreciable extensión vertical, que indica una atmósfera estáticamente estable hasta la base e inestable por encima. 1, record 7, Spanish, - diseminaci%C3%B3n%20de%20contaminantes%20en%20altura
Record 8 - internal organization data 1992-12-31
Record 8, English
Record 8, Subject field(s)
- Air Pollution
- Atmospheric Physics
- Chimneys (Building Elements)
Record 8, Main entry term, English
- looping
1, record 8, English, looping
correct
Record 8, Abbreviations, English
Record 8, Synonyms, English
Record 8, Textual support, English
Record number: 8, Textual support number: 1 DEF
Formation of a pollution plume which is distorted by large vertical eddies in an unstable atmosphere. 1, record 8, English, - looping
Record 8, French
Record 8, Domaine(s)
- Pollution de l'air
- Physique de l'atmosphère
- Cheminées (Éléments du bâtiment)
Record 8, Main entry term, French
- panache en volutes
1, record 8, French, panache%20en%20volutes
masculine noun
Record 8, Abbreviations, French
Record 8, Synonyms, French
Record 8, Textual support, French
Record number: 8, Textual support number: 1 DEF
Panache de pollution distordu par de grands tourbillons verticaux dans une atmosphère instable. 1, record 8, French, - panache%20en%20volutes
Record 8, Spanish
Record 8, Campo(s) temático(s)
- Contaminación del aire
- Física de la atmósfera
- Chimeneas (Elementos de edificios)
Record 8, Main entry term, Spanish
- formación de rizos
1, record 8, Spanish, formaci%C3%B3n%20de%20rizos
feminine noun
Record 8, Abbreviations, Spanish
Record 8, Synonyms, Spanish
Record 8, Textual support, Spanish
Record number: 8, Textual support number: 1 DEF
Formación de un penacho de contaminación causado por turbulencias verticales en una atmósfera inestable. 1, record 8, Spanish, - formaci%C3%B3n%20de%20rizos
Record 9 - internal organization data 1988-04-14
Record 9, English
Record 9, Subject field(s)
- Air Pollution
- Environmental Studies and Analyses
- Meteorology
Record 9, Main entry term, English
- air driving force
1, record 9, English, air%20driving%20force
correct
Record 9, Abbreviations, English
Record 9, Synonyms, English
Record 9, Textual support, English
Record number: 9, Textual support number: 1 CONT
Between the source and sink of a pollutant in the atmosphere dispersion and transport occur simultaneously. Dispersion is caused by turbulent eddies which develop in air that is thermally unstable or that is subjected to a strong wind shear. Transport is controlled by air circulations whose driving force may be local, regional or global in extent. 1, record 9, English, - air%20driving%20force
Record 9, French
Record 9, Domaine(s)
- Pollution de l'air
- Études et analyses environnementales
- Météorologie
Record 9, Main entry term, French
- force d'entraînement de l'air
1, record 9, French, force%20d%27entra%C3%AEnement%20de%20l%27air
feminine noun
Record 9, Abbreviations, French
Record 9, Synonyms, French
Record 9, Textual support, French
Record 9, Spanish
Record 9, Textual support, Spanish
Copyright notice for the TERMIUM Plus® data bank
© Public Services and Procurement Canada, 2025
TERMIUM Plus®, the Government of Canada's terminology and linguistic data bank
A product of the Translation Bureau
Features
Language Portal of Canada

Access a collection of Canadian resources on all aspects of English and French, including quizzes.
Writing tools

The Language Portal’s writing tools have a new look! Easy to consult, they give you access to a wealth of information that will help you write better in English and French.
Glossaries and vocabularies

Access Translation Bureau glossaries and vocabularies.
- Date Modified: