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LEE CYCLONE [3 records]

Record 1 2022-10-24

English

Subject field(s)
  • Atmospheric, Climatic and Meteorological Phenomena
DEF

A small-scale cyclone that forms on the leeward, or downwind, side of mountain barriers as the general westerly flow is disturbed by the mountain.

OBS

Lee cyclones may produce major windstorms and dust storms downstream of a mountain barrier.

French

Domaine(s)
  • Phénomènes météorologiques, climatiques et atmosphériques

Spanish

Save record 1

Record 2 2008-03-12

English

Subject field(s)
  • Atmospheric Physics
DEF

A stormy, rain-bringing wind from the southwest or south-southwest in Hawaii.

OBS

It blows about five times a year on the southwest slopes that are in the lee of the prevailing northeast trade winds. Kona is the Polynesian word for leeward. It is associated with a southward or a southeastward swing of the Aleutian low and the passage of a secondary depression(kona cyclone) from northwest to southeast, north of the islands.

French

Domaine(s)
  • Physique de l'atmosphère
DEF

Vent tempétueux et pluvieux soufflant du sud-ouest à Hawaï.

OBS

Les sources consultées ne nous ont pas permis de déterminer le genre de «kona».

Spanish

Save record 2

Record 3 2003-05-13

English

Subject field(s)
  • Atmospheric Physics
  • Fluid Mechanics and Hydraulics (Physics)
CONT

Along a loop, 8650 m long and traversing a hilly landscape, the air temperature was measured at four levels (0.2, 1.0, 2.0 and 3.0 m a g). ... Sudden rises in air temperature at 2.0 m occurred at a number of elevated locations along the loop, at a maximum rate of 3.5°C/hour, indicative of the influence of dynamic turbulence.

CONT

In spring, dust storms take place in deserts and dry loess plateau... These vast areas are located in the lee of the massive East Asian Mountains where a convergent airflow and a lee cyclone take place on a synoptic scale.... In particular, a convergent flow in a lee cyclonic system enhances an upward motion, and dust produced by mechanical and dynamic turbulence can be transported to the midtroposphere...

CONT

Dynamic turbulence in the atmospheric planetary boundary layer.

French

Domaine(s)
  • Physique de l'atmosphère
  • Mécanique des fluides et hydraulique (Physique)
CONT

La turbulence dynamique provient du frottement de l'air en mouvement contre un sol présentant une certaine rugosité : accidents du relief, végétation, constructions...

CONT

Afin de pouvoir quantifier les échanges d'ozone et de cerner l'impact de cette molécule sur le fonctionnement des couverts forestiers et agricoles, nous avons cherché à paramétrer sa vitesse de «dépôt» (i.e. absorption par des surfaces, circulation dans des pores et autres voies de transfert [...]). [...] le dépôt nocturne en conditions sèches est contrôlé par la turbulence dynamique (vitesse de frottement); pour des conditions dynamiques données, le dépôt augmente sensiblement avec l'humidité relative de l'air; si le dépôt stomatique est dominant en conditions diurnes [...]

Spanish

Save record 3

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