What causes Coriolis power

Coriolis force

Coriolis force, Force acting on moving bodies on the rotating earth. Horizontal movements are deflected to the right in the northern hemisphere and to the left in the southern hemisphere. Since the Coriolis force itself does not generate any movement but merely deflects an existing movement, it is also referred to as an apparent force. It was first developed in 1835 by the French engineer G.G. Coriolis described. The Coriolis force is caused by the fact that movements on the earth do not take place in an inertial system, but the earth is a rotating system. The easiest way to illustrate the Coriolis force for horizontal movements is at the poles. The linear movement of a particle is apparently deflected in the earth's coordinate system by the earth rotating below (Fig.). The greater the speed of the particle perpendicular to the axis of rotation of the earth, the greater the deflection in a fixed time unit and thus the Coriolis force. Except at the equator, every horizontal movement in the earth's coordinate system has a component perpendicular to its axis of rotation. With the exception of the poles, this also applies to every vertical movement on which the Coriolis force also acts in accordance with the above considerations. In mathematical terms, it affects the motion of a particle as follows:

= Flow vector in all three spatial directions, t = Time and

= Angular velocity vector of the earth with the direction of the axis of rotation. However, from an oceanographic point of view, mostly only the component of the Coriolis force that acts on the horizontal movements is relevant. For the west-east and south-north components of the equations of motion, the accelerations due to the Coriolis force are given the following form:


Here are u, v the speed components in west-east or south-north direction and f is the Coriolis parameter.

Coriolis force: Apparent deflection of the rectilinear movement of a particle relative to the earth rotating below (top view of the North Pole). Ω = angular velocity of the earth; A.1, A.2 = End position of a particle moving away from the North Pole without / with earth rotation (viewed from a coordinate system connected to the earth); r1, r2 = distance covered by the particle without / with earth rotation. Arc of the A.1 and A.2 connects = deflection of the particle caused by the earth's rotation (viewed from a coordinate system rotating with the earth). Coriolis force: