9-15 and 9-17 notes

9-15 and 9-17 notes - Global Circulation PFW-L Model STHP-H...

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ITCZ-L STHP-H PFW-L Global Circulation Model 9/15/08 Geography 1111 AIR PRESSURE AND WIND 1. Basic definitions and concepts Pressure gradient Wind Differential heating Coriolis effect 2. Upper tropospheric winds 3. Surface winds Basic definitions and concepts Avg surface pressure=1013mb High pressure atmosphere “heavy” (>1013mb) Low pressure atmosphere “light” (<1013mb) Pressure gradient: a change in air pressure with horizontal distance o Pressure force always acting from high to low pressure. Pressure gradient force (PGF): pressure that causes air to more from H L o Isobar- lines of constant pressure High pressure diverge air at surface. Low pressure convergent air at surface Low pressure causes clouds to form Differential heating: sea breezes/land breezes o Sea breezes blow on land during day and land breezes blow to sea during night.
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Differential heating: monsoons Wet season-summer, dry season-winter Energy imbalance
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