winds1 - Winds Pressure and Pressure Gradient Force...

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Winds Pressure and Pressure Gradient Force Coriolis Force Friction Resulting winds
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Wind Wind speed and direction are typically a function of 3 things: 1. Pressure gradient force
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Air Pressure Air pressure = Force/Area Units: inches (of mercury) millibars (mb) Average sea-level pressure: - 29.90 inches of Hg - 1013 mb
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Pressure and Pressure Gradient H L
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Pressure Gradient Force Steeper pressure gradient = stronger winds
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What causes differences in surface pressure? 1. Temperature gradients
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Temperature, Pressure and Density Ideal Gas Law: P = pressure = air density R = gas constant T = temperature Aguado and Burt, Fig. 4-1 ρ
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Aguado and Burt, Fig. 4-7 g Z P ρ = / RT P / =
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g z p ρ - = Hydrostatic equation: How pressure changes with height Pressur e change Height change Density (kg/m3) Gravity (m/sec- 2)
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Sea Breeze
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Sea Breeze H L
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Sea Breeze
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Sea Breeze
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pressure? 2. Dynamic atmospheric processes
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winds1 - Winds Pressure and Pressure Gradient Force...

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