Smaller gyres also exist at the poles, and one circulates around Antarctica. Short-lasting, smaller currents often spin off both small and large gyres. The Gulf Stream, a particularly strong current that is part
factors are all low-level forcing mechanisms that set air currents in motion or perturb existing currents. Above the Boundary Layer, winds are directed by two factors: the gradients that exist between centres of high and low pressure (anticyclones and cyclones respectively) - air will always ...