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The Government of Canada’s terminology and linguistic data bank.
TOIT INVERSION [2 records]
Record 1 - internal organization data 2005-05-16
Record 1, English
Record 1, Subject field(s)
- Atmospheric Physics
Record 1, Main entry term, English
- top of the inversion layer
1, record 1, English, top%20of%20the%20inversion%20layer
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- top of the inversion 2, record 1, English, top%20of%20the%20inversion
correct
- inversion top 3, record 1, English, inversion%20top
correct
- roof of the inversion 4, record 1, English, roof%20of%20the%20inversion
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
The top of the inversion layer is where the air reaches its highest temperature. The air below that level cannot ascend. (Because each parcel of air below has a cooler temperature, it is therefore denser, and gravity keeps it trapped in place.) 1, record 1, English, - top%20of%20the%20inversion%20layer
Record number: 1, Textual support number: 2 CONT
Warm air has formed a layer on top of cooler surface air. This layer is called the temperature inversion. This means that temperatures actually rise as we measure farther up into the air. Little or no mixing occurs and concentrations of atmospheric particulate pollution and vapors are trapped below the level where temperatures again decrease with altitude. This point is referred to as the top of the inversion. Inversions can occur at the surface or aloft in the atmosphere. 5, record 1, English, - top%20of%20the%20inversion%20layer
Record number: 1, Textual support number: 3 CONT
... a hot-air or gas balloon attempting to descend through a subsidence inversion will find, first, a possible bump or hesitancy of the balloon to "bust" through the top of the inversion. Once through the top of the inversion, the balloon may require much more lift than was required above the inversion top to maintain the same rate of descent. 3, record 1, English, - top%20of%20the%20inversion%20layer
Record 1, French
Record 1, Domaine(s)
- Physique de l'atmosphère
Record 1, Main entry term, French
- sommet de la couche d’inversion
1, record 1, French, sommet%20de%20la%20couche%20d%26rsquo%3Binversion
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- sommet de l’inversion 2, record 1, French, sommet%20de%20l%26rsquo%3Binversion
correct, masculine noun
- toit de l'inversion 3, record 1, French, toit%20de%20l%27inversion
masculine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
Stratopause [signifie le] sommet de la couche d’inversion dans la stratosphère supérieure, situé vers 50 à 55 km [...] 1, record 1, French, - sommet%20de%20la%20couche%20d%26rsquo%3Binversion
Record number: 1, Textual support number: 2 CONT
La couche d’inversion faisait environ 600 ou 700 mètres de haut. Nous décollions [en montgolfière] des environ d’Eugénie les bains, sur un plateau. [...] La visibilité horizontale était cependant limitée du fait de l’inversion. Nous décidons donc d’atteindre le sommet de l’inversion. 4, record 1, French, - sommet%20de%20la%20couche%20d%26rsquo%3Binversion
Record number: 1, Textual support number: 1 OBS
couche d’inversion : Couche de l’atmosphère dans laquelle la température augmente ou demeure constante avec l’altitude. 5, record 1, French, - sommet%20de%20la%20couche%20d%26rsquo%3Binversion
Record 1, Spanish
Record 1, Textual support, Spanish
Record 2 - internal organization data 1989-03-31
Record 2, English
Record 2, Subject field(s)
- Air Pollution
- Atmospheric Physics
- Chimneys (Building Elements)
Record 2, Main entry term, English
- trapped plume
1, record 2, English, trapped%20plume
proposal
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record number: 2, Textual support number: 1 OBS
"trapping": When an inversion occurs aloft such as frontal or subsidence inversion a plume released beneath the inversion will be trapped beneath it. Even if the diffusion is good beneath the inversion such as a coning plume, the limit to upward diffusion will increase concentration in the plume and at ground level. 2, record 2, English, - trapped%20plume
Record number: 2, Textual support number: 2 OBS
Trapping exists under the same conditions as fumigation but the plume does not reach ground level along the plume length. 3, record 2, English, - trapped%20plume
Record 2, French
Record 2, Domaine(s)
- Pollution de l'air
- Physique de l'atmosphère
- Cheminées (Éléments du bâtiment)
Record 2, Main entry term, French
- panache piégé
1, record 2, French, panache%20pi%C3%A9g%C3%A9
masculine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
- panache emprisonné 2, record 2, French, panache%20emprisonn%C3%A9
proposal, masculine noun
Record 2, Textual support, French
Record number: 2, Textual support number: 1 CONT
"Panaches piégés" : Lorsqu’il se produit en altitude une inversion telle qu’une inversion frontale ou une inversion de subsidence, les panaches émis sous l’inversion sont piégés entre l’inversion et la surface de la terre. Même si la diffusion est bonne sous l’inversion, comme dans le cas des panaches coniques, elle est limitée vers le haut, de sorte que la concentration des polluants augmente dans le panache et au sol. La variation diurne des gradients thermiques près du sol, dans les campagnes éloignées des sources de chaleur urbaines, lorsque le ciel est dégagé, est illustrée à la figure 5. Dans de telles conditions, le gradient thermique décrit un cycle quotidien marqué, dans les quelques premières centaines de mètres au-dessus du sol. 1, record 2, French, - panache%20pi%C3%A9g%C3%A9
Record number: 2, Textual support number: 1 OBS
[l'allure d’un panache varie en fonction des états de l'atmosphère. ] Inversion de température débutant au niveau du sol et dépassant le niveau d’émission des fumées. [Dans ces conditions] le panache s’étale horizontalement et reste très étroit, le terrain environnant la source d’émission est emprisonné sous un toit de fumée, la pollution y est très forte. 3, record 2, French, - panache%20pi%C3%A9g%C3%A9
Record 2, Spanish
Record 2, Textual support, Spanish
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