Topic 1: 1.1 The atmosphere operates as a global system which transfers heat around the Earth — Edexcel GCSE Geography B
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Topic 1: 1.1 The atmosphere operates as a global system which transfers heat around the Earth explained
Topic 1: 1.1 The atmosphere operates as a global system which transfers heat around the Earth covers 2 specification points, including A.
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The global atmospheric circulation and how… and B. How global atmospheric circulation…. Open a point below for its explanation and revision guidance.
a. The global atmospheric circulation and how circulation cells and ocean currents transfer and redistribute heat energy around the Earth.
Global atmospheric circulation moves air to redistribute heat from the equator, which gains more solar energy than it loses, towards the poles, which lose more than they gain. Each hemisphere has three cells: the Hadley (equator to about 30°), the Ferrel (about 30° to 60°) and the polar (about 60° to the pole). In each cell, air rises, moves horizontally and sinks, forming a loop that transports heat. Ocean currents do similar work: the warm Gulf Stream carries heat poleward, while the cold Labrador Current returns water towards the equator. Together, cells and currents transfer and redistribute heat energy, reducing temperature differences across the Earth.
b. How global atmospheric circulation determines the location of arid (high pressure) and high rainfall (low pressure) areas.
Global circulation creates a repeating pattern of pressure belts that controls where rain falls and where deserts form. At the equator, warm air rises, cools and condenses, producing low pressure, cloud and high rainfall, as in the Amazon basin. Near 30° north and south, air that rose at the equator sinks in the Hadley cell, warms and dries, producing high pressure and arid conditions such as those of the Sahara. Air also rises at about 60°, creating low pressure and rain, and sinks at the poles, creating high pressure. Belts shift seasonally with the sun. Explain the location of arid and rainy areas by linking them to the rising and sinking limbs of each cell, not to local features alone.
Your focus
- Label the Hadley, Ferrel and polar cells on a diagram of one hemisphere, with approximate latitudes.
- Describe how the atmosphere and oceans move heat from the equator towards the poles.
- Identify warm and cold ocean currents that transfer heat between low and high latitudes.
Show all 6 objectives
- Locate the equatorial low and subtropical high pressure zones on a labelled diagram.
- Explain why rising air produces high rainfall and sinking air produces arid conditions.
- Justify the location of a named arid or high rainfall area using the global circulation pattern.
Topic 1: 1.1 The atmosphere operates as a global system which transfers heat around the Earth flashcards
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Global atmospheric circulation
Topic 1: 1.1 The atmosphere operates as a global system which transfers heat around the Earth exam tips
Marking Points
- Identifies that heat is redistributed from the equator, which has a surplus, towards the poles, which have a deficit.
- Names the Hadley, Ferrel and polar cells and gives the approximate latitude of each.
- Describes the rising, horizontal and sinking movement within a cell as a loop that transports heat.
- Recognises that ocean currents, such as the Gulf Stream and Labrador Current, transfer heat alongside the atmosphere.
- Explains that atmospheric circulation and ocean currents together reduce temperature differences across the Earth.
- Identifies that rising air at the equator cools and condenses, producing low pressure and high rainfall.
- Explains that air sinking at about 30° north and south warms and dries, producing high pressure and arid conditions.
- Links the location of deserts such as the Sahara to the sinking limb of the Hadley cell.
- Recognises that rising air at about 60° also forms low pressure belts linked to rainfall.
- Explains that the pressure belts are produced by global circulation rather than by local features alone.
Examiner Tips
- 💡Draw a labelled cross-section of one hemisphere showing the three cells and arrows for heat movement before reading the options.
- 💡Read every option against your diagram and eliminate any that reverse the direction of heat flow between equator and poles.
- 💡When an option names a current, check whether it is warm or cold and whether it moves heat towards or away from the equator.
- 💡Annotate a cell diagram with the words rising, low pressure, sinking and high pressure before answering.
- 💡Check whether each option pairs arid conditions with high pressure and high rainfall with low pressure, since reversing these is a common distractor.
- 💡Use the latitude of a named place to decide whether it sits in a rising or sinking zone, then match it to the correct option.
Common Mistakes
- Treats the equator as losing more heat than it gains; correct it by recognising that the equator is a net gainer of solar energy.
- Places the Ferrel cell between the equator and 30°; correct it by placing the Hadley cell there and the Ferrel cell between about 30° and 60°.
- Describes ocean currents as unrelated to heat; correct it by linking currents to the transfer of heat from low to high latitudes.
- Links high rainfall to high pressure; correct it by associating rising air and low pressure with high rainfall.
- Places arid conditions at the equator; correct it by locating dry, high-pressure conditions where air sinks, near 30°.
- Explains desert location using only local features such as distance from the sea; correct it by linking location to the global cell pattern.