Urban Climate Flashcards

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1
Q

what is the urban heat island

A

urban areas are warmer than their rural surroundings. this is known as the UHI which is an average of 1-2 degrees warmer per year than its surroundings

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2
Q

what is the venturi effect

A

urban canyons produce high wind velocities thanks to it, as it has the effect of ‘squeezing’ the airflow

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3
Q

what is the albedo

A

the amount of warmth reflected off a surface

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4
Q

what is the sky view factor

A

the amount of sky we can see without our view being impended by tall buildings

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5
Q

what is specific heat capacity

A

the amount of energy needed to heat 1 gram of a substance by 1 degrees celcius

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6
Q

explain the urban heat island

A

sunlight heats the air very slowly so its actually the sun heating surfaces that heat the air around it
water has a high albedo (sucks up the suns energy) and as there is less exposed water in cities the heat is put straight onto buildings which absorb the energy
at night the temperature difference (diurnal temperature range) is bigger

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7
Q

how can cities manage the UHI effect

A

by putting in place more vegetation and open spaces

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