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Hypothetically, if the Earth's surface was entirely composed of water, there would be a single convection cell where hot air rises and moves towards the poles, while cold air moves towards the Equator as wind, undercutting the hot air. This idea was proposed by Halley (1686) and developed by Hadley (1735).

The existence of irregularities in the Earth's surface (land) results in three convection cells: Hadley, Ferrel and a weak Polar cell.

Key words to investigate: tricellular model, Inter-Tropical-Convergence-Zone (ITCZ) (existing between the Northern and Southern Hemisphere Hadley cells), doldrums (weak winds experienced in the ITCZ) and jet streams.

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13y ago

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