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Circulation patterns in terrestrial atmosphere2

Circulation patterns in terrestrial atmosphere2 - circling...

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Circulation patterns in terrestrial atmospheres The middle cell is called the Ferrel Cell. The air particles do not actually circulate in the longitude plane as shown by the arrows because of the Coriolis forces. The "W" and "E" on the diagram shows the Coriolis forcing, and this leads to the predominant Wind Belts known in each hemisphere, such as the 'trade winds': The resultant ground-level wind pattern: Large-Scale Eddying: Baroclinic Eddies Baroclinic Eddies are the circular patterns we see on weather maps - the cyclones and anticyclones (or "Highs" and "Lows") caused by Coriolis divergence of the flow around a high or low pressure centre. The convergence of two such eddies leads to Jet Streams . On Venus it is not known if these exist. On Earth there are usually 6-7 pairs of highs and lows
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Unformatted text preview: circling the globe around the jet streams. They are irregular in formation and duration. On Mars they are thougd duration. On Mars they are thought to only occur in the winter hemisphere and are quasi-periodic (therefore again the Martian weather is more "predictable"?) Large-Scale Eddying: Topographic Effects There are a number of effects due to geographic features: stationary eddies (e.g due to ocean -> continent temperature or elevation effects) lee waves (stationary waves set up in the lee of mountain chains Such eddies do not propagate horizontally, but can transport heat and momentum vertically. These effects can be large on Mars and Venus due to the size of the topographic features on these planets....
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