Atmosphere Circulations

Hadley Cell

Allan Harmon

LP = Low Pressure; HP = High Pressure

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Ferrel Cell

Between the Subtropical Jet (moisture/heat transport into the mid-latitudes) and the Polar Jet (moisture/heat transport poleward), there is another cell circulation of the atmosphere. Not quite as large as the Hadley Cell (shape of the earth+heat/energy loss). Also known as the Mid-Latitude Circulation. Winds at the surface move poleward at the surface and rise as they near the upper latitudes (around 60N/60S), leading to the development of the polar jet. Winds flow equatorward in the upper levels.

Polar Jet Situated at about 10 km AGL over the polar front (30-70oN)
Subtropical Jet Situated above the subtropical high...
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Polar Cell

As the air from the jet stream diverges from the polar jet, some of that air continues poleward and sinks, forming what tends to be a polar high pressure. Surface winds diverge outward from the high-pressure areas and usually at 60N the winds are predominately easterly.

Putting It All Together…

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