7-GlobCirc-Fa09

7-GlobCirc-Fa09 - Global Atmospheric Circulation I....

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Global Atmospheric Circulation I. Idealized circulation pattern A. “One-cell model” B. “3 cell model” II. Observed patterns (models are …uh well models, what happens in reality) Exam 1 in about two weeks. Date will be announced later this week Simple model of global circulation
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Global Circulation: In 1735 George Hadley declared that temperature contrasts between Poles and Equator drives global circulation Works great for a non-rotating earth! Rotation causes winds to be deflected One-cell Global Circulation Model “Hadley cell”
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ITCZ SE trades 3-cell Model accounts for Coriolis Mid-Lat Cell Polar Cell
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Idealized Wind and Pressure Belts 3 Cell Model works for a rotating all water earth NEED TO LEARN THIS MODEL!
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General rules on pressure/weather relationship: areas of L have clouds and rain areas of H have fair weather High and Dry! LOW HIGH
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1. Equatorial Low…also called… ITCZ (Inter Tropical Convergence Zone) Air rises to tropopause due to intense heating (THERMAL LOW Pressure) diverges aloft and moves toward poles Light winds: “Doldrums” (~5 ° N—5 ° S) Components of 3 Cell Model Constant Clouds and Rain
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2. Subtropical High pressure (STH) ~30º (20º-35º) each hemisphere, air aloft cools and sinks Cools due to radiative heat loss into space Heavier cool air piles up aloft and sinks
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7-GlobCirc-Fa09 - Global Atmospheric Circulation I....

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