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Coriolis Effect

Coriolis Effect. On the Earth “down” includes centrifugal effects. Objects at rest Assume effective gravity Local coordinates match “down” Select 3-axis opposite to down. North in plane with w East as 1-axis. Going Down. Local Velocity.

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Coriolis Effect

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  1. Coriolis Effect

  2. On the Earth “down” includes centrifugal effects. Objects at rest Assume effective gravity Local coordinates match “down” Select 3-axis opposite to down. North in plane with w East as 1-axis Going Down

  3. Local Velocity • The angular velocity of the Earth can be expressed in local coordinates. • The local velocity is used to get the Coriolis force. e2 e3 q

  4. Deflection • Velocity Northern Southern Hemisphere • North East West • South West East • East South and Up North and Up • West North and Down South and Down • Up West West • Down East East

  5. Cyclone • In the absence of rotation air would move from high to low pressure. • Straight line wind • The Coriolis force causes wind to turn. • Friction causes equilibrium • Circular pattern L L

  6. The general wind circulation is a result of Coriolis forces. Equatorial warm air rises and turns east. Replacing cold air turns west Trade winds Northbound air here turns east – prevailing wind. Global Flow

  7. A pendulum has a local velocity. Measure displacement from equilibrium. Coriolis force causes a deflection. Select frame that rotates wF with deflection. Pendulum Swing Fcor Fcor

  8. The new rotation vector is up in the local system. Related to colatitude Select the local rotation to cancel the Earth’s rotation. Pendulum moves in a turning plane Turning represents precession Foucault Pendulum

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