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Difficulty: EasyClimate Types and Characteristics of Africa

In Africa's Sudan Savanna climate zone, rainfall is strictly seasonal and concentrated within a single wet season. Which atmospheric mechanism primarily controls the seasonal movement of rainfall across this zone?

  1. The seasonal apparent movement of the Inter-Tropical Convergence Zone (ITCZ)Answer
  2. B
    The persistent upwelling of the cold Benguela Current along the western coastline
  3. C
    The stationary presence of the South Atlantic subtropical high-pressure belt
  4. D
    The continuous flow of polar maritime air masses from the southern ocean

Answer

The seasonal apparent movement of the Inter-Tropical Convergence Zone (ITCZ)
The correct answer identifies the seasonal apparent movement of the Inter-Tropical Convergence Zone (ITCZ). The ITCZ is a low-pressure belt where trade winds converge. Its movement northwards following the sun during the Northern Hemisphere summer draws moisture-laden Tropical Maritime air into interior West and Central Africa, producing the characteristic single rainy season of the Sudan Savanna climate zone.

Step-by-Step Solution

1
Identify the climatic characteristics of the Sudan Savanna zone in Africa.
The Sudan Savanna experiences a tropical continental climate marked by distinct wet and dry seasons.
Rainfall in this zone occurs primarily when warm, humid air masses drawn by low-pressure systems sweep over the continent.
2
Analyze the primary atmospheric driver responsible for shifting rain-bearing air masses across sub-Saharan Africa.
The Inter-Tropical Convergence Zone (ITCZ) follows the apparent movement of the sun, shifting northwards toward the Tropic of Cancer in July and southwards toward the Tropic of Capricorn in January.
As the ITCZ moves north in northern summer, it pulls the rain-bearing Tropical Maritime (mT) air mass deep into the Sudan Savanna zone.

Key Concept

Inter-Tropical Convergence Zone (ITCZ) and Seasonal Rainfall in Africa
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Topics

Climate Types and Characteristics of Africa

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