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Zonal and meridional flow are directions and regions of fluid flow on a globe.Zonal flow follows a pattern along latitudinal lines, latitudinal circles or in the west–east direction. Meridional flow follows a pattern from north to south, or from south to north, along the Earth's longitude lines, longitudinal circles (meridian) or in the north–south direction.These terms are often used in the atmospheric and earth sciences to describe global phenomena, such as "meridional wind", or "zonal average temperature".

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  • Els termes zonal i meridional s'utilitzen per descriure direccions en un globus. Zonal significa "al llarg d'un paral·lel" o "en la direcció est-oest"; mentre que meridional significa "al llarg d'un meridià" o "en la direcció nord-sud". Aquests termes es fan servir sovint en ciències atmosfèriques i ciències de la Terra per descriure fenòmens globals, com "flux de vent meridional", o "temperatura zonal". (Parlant estrictament, zonal significa més que una direcció perquè també implica un grau de localització en la direcció meridional, de manera que el fenomen en qüestió queda localitzat en una zona del planeta.) Per camps vectorials (com la velocitat del vent), el component zonal (o la coordenada x) es denota com a u, mentre que el component meridional (o coordenada y) es denota com a v. El terme, de vegades abreujat com a "Mer.", s'utilitzava antigament en astronomia per indicar la direcció sud al globus celestial, juntament amb septentrional ("Sep.") pel nord, Oriental ("Ori.") per l'est i Occidental ("Occ.") per l'oest. (ca)
  • Zonal and meridional flow are directions and regions of fluid flow on a globe.Zonal flow follows a pattern along latitudinal lines, latitudinal circles or in the west–east direction. Meridional flow follows a pattern from north to south, or from south to north, along the Earth's longitude lines, longitudinal circles (meridian) or in the north–south direction.These terms are often used in the atmospheric and earth sciences to describe global phenomena, such as "meridional wind", or "zonal average temperature". In the context of physics, zonal flow connotes a tendency of flux to conform to a pattern parallel to the equator of a sphere. In meteorological term regarding atmospheric circulation, zonal flow brings a temperature contrast along the Earth's longitude. Extratropical cyclones in zonal flows tend to be weaker, moving faster and producing relatively little impact on local weather. Extratropical cyclones in meridional flows tend to be stronger and move slower. This pattern is responsible for most instances of extreme weather, as not only are storms stronger in this type of flow regime, but temperatures can reach extremes as well, producing heat waves and cold waves depending on the equator-ward or poleward direction of the flow. For vector fields (such as wind velocity), the zonal component (or x-coordinate) is denoted as u, while the meridional component (or y-coordinate) is denoted as v. In plasma physics Zonal flow (plasma) means poloidal, which is the opposite from the meaning in planetary atmospheres and weather/climate studies. (en)
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  • Els termes zonal i meridional s'utilitzen per descriure direccions en un globus. Zonal significa "al llarg d'un paral·lel" o "en la direcció est-oest"; mentre que meridional significa "al llarg d'un meridià" o "en la direcció nord-sud". Aquests termes es fan servir sovint en ciències atmosfèriques i ciències de la Terra per descriure fenòmens globals, com "flux de vent meridional", o "temperatura zonal". (Parlant estrictament, zonal significa més que una direcció perquè també implica un grau de localització en la direcció meridional, de manera que el fenomen en qüestió queda localitzat en una zona del planeta.) Per camps vectorials (com la velocitat del vent), el component zonal (o la coordenada x) es denota com a u, mentre que el component meridional (o coordenada y) es denota com a v. El (ca)
  • Zonal and meridional flow are directions and regions of fluid flow on a globe.Zonal flow follows a pattern along latitudinal lines, latitudinal circles or in the west–east direction. Meridional flow follows a pattern from north to south, or from south to north, along the Earth's longitude lines, longitudinal circles (meridian) or in the north–south direction.These terms are often used in the atmospheric and earth sciences to describe global phenomena, such as "meridional wind", or "zonal average temperature". (en)
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  • Zonal i meridional (ca)
  • Zonal and meridional flow (en)
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