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Meteorologie,Climatologie,Agrometeorologie - Enciclopedia
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Forta Coriolis


Fortele care apar in fluidul atmosferic sunt: forte de volum si forte de suprafata. Fortele de care depinde circulatia atmosferica: forta de atractie a Pamantului, forta Coriolis, forta presiunii, fortele de frecare. Forta Coriolis si forta centrifuga se numesc forte aparente.


Forta Coriolis(forta geostrofica, forta de deviatie a Pamantului) a fost numita dupa numele fizicianului francez G.C.Coriolis (1792-1843) si este una dintre cele mai importante forte aparente.


Denumirea de forta de deviatie se datoreaza fenomenului de abatere de la directia initiala pe care o impune fluidelor ce curg la suprafata Pamantului, in conditii de frecare redusa. In cazul curgerilor mai indelungate , de exmplu circulatia atmosferica, aceasta forta isi pune o amprenta importanta.


Daca un corp este vazut dintr-un sistem de coordonate care se roteste, forta aparenta deviaza acel corp in miscare de la traiectoria dreapta, noua traiectorie fiind curbata in sens opus sensului de rotatie a sistemului de coordonate considerat. Forta deviatoare( Coriolis) poate schimba numai directia de miscare, dar nu si marimea vitezei de miscare, si actioneaza perpendicular pe vectorul viteza si pe vectorul viteza de rotatie a Pamantului.


Forta Coriolis poate fi neglijata pentru analiza miscarilor pe verticala, fara a fi compromisa acuratetea, dar aproximatiile trebuiesc facute pentru scara sinoptica (nu pot fi aplicate in cazul sistemelor de mezoscara, in cazul norilor foarte dezvoltati, gen Cumulonimbus, unde viteza verticala si acceleratia pot fi foarte mari).


Parametrul Coriolis se scrie scalar: f=2Ωsin φ, depinde de latitudinea locului si reprezinta intensitatea fortei Coriolis. De-a lungul axei de rotatie nu apare acceleratia Coriolis .Abaterea de la traiectorie este spre stanga in emisfera nordica si spre dreapta in emisfera sudica.










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