Lecture 4: Pressure and Wind

Lecture 4: Pressure and Wind

Pressure, Measurement, Distribution Forces Affect Wind

Geostrophic Balance Winds in Upper Atmosphere Near-Surface Winds

Hydrostatic Balance (why the sky isn't falling!) Thermal Wind Balance

ESS55 Prof. Jin-Yi Yu

Wind is moving air.

ESS55 Prof. Jin-Yi Yu

Force that Determines Wind

Pressure gradient force Coriolis force Friction Centrifugal force

ESS55 Prof. Jin-Yi Yu

Thermal Energy to Kinetic Energy

Pole

cold

H (high pressure)

pressure gradient force

Eq

warm

L (low pressure)

(on a horizontal surface)

ESS55 Prof. Jin-Yi Yu

Global Atmospheric Circulation Model

ESS55 Prof. Jin-Yi Yu

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