Case Study → Contribution of Human Activity, Increasing Risk of Drought, Sahel Region (Edexcel A-Level Geography): Flashcards
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Where is the Sahel Region?
Where is the Sahel Region?
South of Sahara Desert, semi-arid
When did Sahel rainfall significantly ↓?
When did Sahel rainfall significantly ↓?
1960s
Physical cause: Sahel drought cycles
Physical cause: Sahel drought cycles
ENSO cycles
% of annual Sahel rainfall in summer
% of annual Sahel rainfall in summer
85%
Human role in Sahel drought
Human role in Sahel drought
Positive feedback loop enhancing impacts
Europe/N America pollution effect on Sahel
Europe/N America pollution effect on Sahel
Cooled Earth, stopped tropical rains moving North
Global warming impact on W Sahel rainfall
Global warming impact on W Sahel rainfall
Higher sea temps block moist Atlantic air
Cause of Sahel desertification
Cause of Sahel desertification
Overuse of land from population pressures
Sahel climate type
Sahel climate type
Semi-arid
Do humans directly cause Sahel drought?
Do humans directly cause Sahel drought?
No, they act as positive feedback loop