IB ESS HL 2.4.5 Tricellular Model Questions
Use the tricellular model to explain global circulation and climate zones.
- Syllabus
- First assessment 2026
- Course
- ESS HL
- Level
- HL
Exam points
- explain how the Hadley, Ferrel and polar cells redistribute heat and create latitude patterns of precipitation and temperature that support different biome distributions
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IB ESS HL 2.4.5 Tricellular Model Questions question 1
[Maximum number: 3]
Atmospheric and plate activity have affected the distribution and diversity of systems within the biosphere.
Explain the role that the atmosphere has in the distribution of biomes.
Role of atmosphere: atmosphere contributes to patterns of climate/heat/temperature/ precipitation;
rising hot, damp air at equator condenses as it meets colder air; ...causing high rainfall and ideal conditions for rainforests in that region;
descending dry air at slightly higher latitudes/30 degrees N/S; ...gives rise to desert systems;
atmospheric circulation transfers heat from equator to higher latitudes; ...allowing for life-supporting temperatures in temperate grasslands/ forests/tundra biomes;
Note to examiners: Credit must be given for answers that address biomes not species.
Full credit can be given for a well drawn annotated tri-cellular model with biomes and atmospheric flows shown.
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