Which of these is a ‘Secondary’ atmospheric circulation? (A) Hadley Cell (B) Trade Winds (C) Cyclones and Anticyclones (D) The Jet Stream
Cyclones and anticyclones are classified as secondary atmospheric circulations. While “primary” circulations (like the Hadley Cell) are global and permanent, secondary circulations are smaller, regional and temporary. They are the individual high and low-pressure systems that move across the planet, directly causing the specific weather changes we experience on a day-to-day basis. ANSWER: (C) Cyclones and Anticyclones
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Primary circulation sets the global stage, but secondary circulation creates the actual weather. Cyclones (low pressure) are characterized by converging, rising air and stormy weather, while anticyclones (high pressure) feature sinking, diverging air and clear skies. These systems are embedded within the primary wind belts, like the Westerlies. There are also “tertiary” circulations, which are even smaller and more localized, such as sea breezes or mountain winds. Understanding how these secondary systems form and move is the essence of daily weather forecasting, as they dictate where rain will fall and how temperatures will shift over specific cities.
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