ess 5 chapter 4

ess 5 chapter 4 - Chapter 4 Pressure and wind 4/15/08 One...

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Chapter 4 Pressure and wind 4/15/08 One Atmospheric Pressure Average air pressure at sea level Often expressed as 1013 mb (millibares) o About 1 kilogram per square centimeter Units of atmospheric pressure Atmospheric o M, kg, second o Wind direction Easterly wind come from east Westerly wind come from west Ocean o Cm, g, second o Current direction Eastward water goes east Westward water goes west 1 pascal = 1 millibar 1 bar = 1000mb Pressure tells you how much mass is above you, the higher the temperature the lower the pressure?? Pressure Gradient Higher pressure to lower pressure Mainly concern about horizontal pressure Vertical pressure gradient are larger than the horizontal pressure 4/17/08 Pressure gradients Determines wind speed Exists horizontal and vertical Vertical pressure gradients are usually greater Hydrostatic Balance in the vertical Vertical pressure force= gravitational force Dp/dz = -pg o How much the pressure much change for the distance= density gravity
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ess 5 chapter 4 - Chapter 4 Pressure and wind 4/15/08 One...

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