The Tricellular model is simply a chain showing the connections between 3 distinct cells namely the Hadley Cell, the Ferrel Cell and the Polar Cell. The origin of the Tricellular model is the equator extending outwards to the poles.
Air is heated at the equator and rises creating cumulonimbus clouds with heavy rain. The air continues outwards and descends at the 30o South and North of the equator creating a subtropical HP (Ferrel cell). This is another factor causing the creation of deserts at the subtropical highs e.gSahara Desert
Polar Cell (LP)
This cell lies between the Hadley and the Polar cell. Raised air from the tropical and polar low pressure converge and descends at 30o creating an area of high pressure with stable conditions.
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