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Heat wave: first estimates of the extent of the urban heat island in Paris

2022-06-17T17:58:12.522Z


Stored by the buildings and the bitumen of the streets which waterproofs the ground, the excess heat stored during the day cannot be dissipated during the night.


A peak is expected during the night from Saturday to next Sunday, in Paris, where it will probably be 24°C or 25°C, at the coolest, and 18°C ​​or 17°C only on the outskirts of the city, or even less.

This temperature difference is caused by what is called an “urban heat island” which is, moreover, amplified during periods of heat wave.

It is a measure of the higher night air temperature in the city than on the outskirts.

“It is not uncommon for the temperature in urbanized city centers to be at night, 4°C to 6°C warmer than in the countryside at the edge of the agglomeration”

, explains Valéry Masson, researcher at the CNRM , a joint CNRS and Météo-France research unit.

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Stored during the day by the buildings and the bitumen of the streets which waterproofs the ground, the excess heat stored during the day cannot be dissipated during the night.

Valéry Masson has already conducted experiments in 2004-2005 in Toulouse to measure the amplitude of…

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Source: lefigaro

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