Temperatures: the Urban Heat Island Effect (AQA A-Level Geography): Flashcards
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Urban Heat Island (UHI) definition
Urban Heat Island (UHI) definition
Urban area warmer than rural surroundings due to human activity
Annual mean temp increase in cities with 1M+ people
Annual mean temp increase in cities with 1M+ people
1-3°C higher than rural surroundings
Max UHI temp difference on calm, clear days
Max UHI temp difference on calm, clear days
12°C
Albedo definition
Albedo definition
How much solar radiation a surface reflects
Urban wind speed reduction vs rural areas
Urban wind speed reduction vs rural areas
20-30% lower
Pollution dome effect on heat
Pollution dome effect on heat
Traps outgoing long-wave radiation back to surface
Green roof temperature reduction on sunny days
Green roof temperature reduction on sunny days
20-40°C
Urban precipitation change vs rural
Urban precipitation change vs rural
5-10% increase
Street canyons
Street canyons
Heat trapped between tall buildings in narrow streets
Urban annual mean humidity change
Urban annual mean humidity change
6% decrease