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CROSS WINDS [2 records]

Record 1 2006-08-19

English

Subject field(s)
  • Oceanography
CONT

"The Peru Current is the strongest of five areas of oceanic upwelling," explained Dr. Julio Valdivia. "Winds blowing up from the south drive surface water offshore, to be replaced by deeper colder waters rich in nutrients."

CONT

Phosphorites are related to the open ocean in that they evidently form on continental platforms and slopes adjacent to oceanic "upwellings," or ascending currents that bring cold, relatively phosphate-rich deep water to the surface.

OBS

upwelling : The rising of cold, heavy sub-surface water toward the surface, especially along the western coasts of continents(as along the coast of southern California) ;the displaced surface water is transported away from the coast by the action of winds parallel to it or by diverging currents. Upwelling may also occur in the open ocean where cyclonic circulation is relatively permanent, or where southern trade winds cross the equator.

French

Domaine(s)
  • Océanographie
CONT

L'activité biologique élevée concentre le phosphore à proximité des zones de remontée des eaux océaniques [...]

OBS

remontée d'eau : Venue d'eaux profondes froides vers la surface de la mer. Les remontées d'eau s'observent à la côte ou au large. [...] - Au large, on constate deux types de situation : dans la zone équatoriale, la divergence des eaux superficielles entraîne des remontées d'eau qui s'étendent de manière quasi continue aux basses latitudes [...] - ailleurs, des remontées sont liées à des phénomènes météo-océaniques transitoires : cyclones tropicaux, dépressions des latitudes moyennes.

Spanish

Save record 1

Record 2 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 2

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