TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

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Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2012-07-13

English

Subject field(s)
  • Climatology
  • Air Pollution
CONT

It is important to note that convective cells can cause air currents both upward and downward. Upward convective currents carry pollutants many kilometers high into the atmosphere. At these high altitudes advective currents and prevailing winds can transport these pollutants vast distances very quickly. As air spreads from the rising column, it is cooled and falls back down to the earth. This results in a circular rotation of the air.

CONT

Drainage of the lake-beds, related to a seasonal phenomenon of dust storms between February and May, has also affected air quality. The midday air temperatures during the dry season generate strong advective currents that elevate salt and clay particles from the former lake bottom. These particles are blown into the city by the prevailing easterly winds.

OBS

advective: of, or caused by, advection.

OBS

advection: the transfer of heat by the horizontal movement of the air.

OBS

advection: The horizontal movement of air around the world is known as advection. Advection is the primary mechanism responsible for long range transport of pollutants. Although transport of pollutants via advection is minuscule at the earth’s surface, at heights above 1000 m, where friction become negligible, wind velocities of 400 km/hr can carry pollutants at extremely fast rates.

French

Domaine(s)
  • Climatologie
  • Pollution de l'air
OBS

Les masses d'air polluées et riches en ozone sont d'abord transportées vers la région de l'Atlantique par la cellule de haute pression qui se dirige vers l'est. La cellule se déplace le long de la côte est de l'Amérique du Nord, créant une poussée d'air du sud ou du sud-ouest qui dirige les polluants par advection dans la région de l'Atlantique.

OBS

advection : Transfert des propriétés d'une masse d'air par déplacement, notamment dans le plan horizontal.

Spanish

Save record 1

Record 2 2001-10-30

English

Subject field(s)
  • Air Pollution

French

Domaine(s)
  • Pollution de l'air
DEF

Mécanismes dynamiques qui entraînent l'ozone atmosphérique selon un axe vertical et qui le dirigent vers la Terre.

Spanish

Campo(s) temático(s)
  • Contaminación del aire
Save record 2

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