GEOG 1F91 Lecture Notes - Lecture 5: Intertropical Convergence Zone, Atmospheric Circulation, Hadley Cell
18 Feb 2016
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Document Summary
Mercury barometer oldest (1643-44) pressure pushes mercury up glass tube. Aneroid barometer -1844, sealed chamber reacts to. Impact humans less o2 is carried with each breath. Tilt + rotation + revolution = different insolation. Differences in insolation = differences in heating of surface. Differences between edmonton and saskatoon is greater than. Air moves from high to low + each rotation affects wind. Does not depend on direction act at right angle to direction. Simple model: ideal earth =2 large convection cells. 3 cell model: hadley cell, ferrel cell, polar cell. Strong insolation = increased air (low pressure) =clouds/precipitation. Air descends = high pressure = inhibit clouds = dry air. Flow back to equatorial trough =deflected by coriolis effect. Pressure change = change in wind patterns. 2nd set of winds from subtropical high flow north. Some flow south some to poles. 30-70 degrees n/s to 90 degrees n/s. Sinks over poles flows outward at polar easterlies.
