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CROSS-ISOBARIC FLOW [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2002-02-25

English

Subject field(s)
  • Atmospheric Physics
DEF

Winds cross isobars at a small angle from high toward low pressure, often associated with friction near the ground.

CONT

Surface Streamlines are simply a "photograph" of the wind. It represents the wind flow at that precise moment. You can check this with the previous map(pressures and temperatures) to see how non-geostrophic the flow is, or how much does it crosses the isobars toward low pressure. A strong cross-isobaric flow often represents a strong system with strong pressure falls and strong areas of convergence.

French

Domaine(s)
  • Physique de l'atmosphère
OBS

En pratique, la terre n'est pas lisse. Elle possède un relief et sa surface est courbe ce qui a pour effet d'offrir une résistance au déplacement de l'air créant ainsi la force de friction. Si on se réfère à la figure suivante, l'introduction de cette nouvelle force a pour effet de réduire la vitesse du vent et par le fait même la force de coriolis. L'équilibre géostrophique n'est plus possible. Le nouvel équilibre est tel que la vitesse du vent est inférieure à la vitesse du vent géostrophique et le vent souffle à travers des isobares.

Key term(s)
  • flux transversal isobare
  • flux traversier isobare
  • flux de côté isobare
  • flux de travers isobare

Spanish

Save record 1

Record 2 2002-01-17

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Cartography
  • Meteorological Forecasting, Data Measurement and Analysis
CONT

To accomplish an approximate gradient wind calculation that depends only on the pressure field, a cruder approximation for the cross-isobaric component is required. One such approach is to use the relationship between Kp(curvature of the isobars) and Kx to infer the tendency for the flow to straighten. As Kp gets closer to and surpasses Kx, we can think in terms of introducing a stronger and stronger "dissipation" mechanism, which would prevent the curvature of the flow, K from ever reaching Kx.

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Cartographie
  • Prévisions météorologiques et mesure et analyse des données
CONT

Le vent géostrophique : vent calculé en considérant les isobares comme étant rectilignes et parallèles. Il ne tient compte ni de la courbure des isobares ni du frottement.

Spanish

Save record 2

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