Chapter10b - Atmosphere-Ocean Interaction The Single Cell...

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Atmosphere-Ocean Interaction
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The Single Cell Model This is a very simplified model based on the following three assumptions: 1. The Earth’s surface is uniformly covered with water (no differential heating of the land and the oceans) 1. The sun is always directly over the equator (no seasonal variations of the winds). 1. The Earth does not rotate. No Coriolis effect. The only active force is the pressure gradient force.
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The Three Cell Model Keep two of the assumptions, relax the third: The Earth is covered with a continuous ocean The sun is always directly over the equator The Earth rotates -> Coriolis force!
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Observing global winds from space Intertropical convergence zone
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Winds and pressure in the real world Semi-permanent highs and lows : persist throughout the year, correspond to converging/diverging upper air masses. Bermuda, Pacific highs; Icelandic, Aleutian lows Seasonal highs and lows (continents heat/cool faster) Winter: Siberian high, Canadian high Summer (thermal lows): Southwest US, Iran July January Subtropical highs Subtropical highs
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Does it work? Yes:
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Chapter10b - Atmosphere-Ocean Interaction The Single Cell...

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