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

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Unformatted text preview: Atmosphere-Ocean Interaction 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) 2. The sun is always directly over the equator (no seasonal variations of the winds). 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! Observing global winds from space Intertropical convergence zone 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 Does it work? • Yes: semi-permanent highs and lows : persist throughout the year • No: seasonal highs and lows (continents heat/cool faster) • No: seasonal shifts N-S (today) • No: winds aloft in mid latitudes July January Subtropical highs Subtropical highs Effect on the local climate...
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This note was uploaded on 01/26/2012 for the course MET 1010 taught by Professor Matchev during the Spring '08 term at University of Florida.

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

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