Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Brèves → Brèves 2018 → By 2100, arid cities will suffer from more severe heat waves than temperate cities

By 2100, arid cities will suffer from more severe heat waves than temperate cities

Phys.org/news (FEBRUARY 13, 2018)

Titre : By 2100, arid cities will suffer from more severe heat waves than temperate cities

Heat waves are among the deadliest and most common of environmental extremes. As the earth continues to warm due to the buildup of greenhouse gases, heat waves are expected to become more severe, particularly for cities, where concrete and a dearth of trees create what’s known as the urban heat island effect.

Phys.org/news (FEBRUARY 13, 2018)

Présentation
Using a global climate model, a team led by Princeton University researchers measured how severely heat waves interact with urban heat islands, now and in the future, in 50 American cities across three climate zones.

In terms of relative temperature increase, today’s eastern and southeastern cities are more severely affected by heat waves than arid and semiarid western cities. This is because of the amount of impenetrable, concrete surfaces and lack of moisture in eastern and southeastern cities compared to their rural surroundings. In contrast, both rural and urban dry environments experience similar temperature increases, and both have less annual rainfall than their eastern and southeastern counterparts.

However, by 2100, this is expected to flip. Arid cities like Phoenix will become hotbeds for heatwaves compared to their rural surroundings, while cities on the eastern seaboard will be less severely affected by heatwaves compared to theirs. This is because future arid cities will remain water-limited due to the lack of permeable surfaces in cities, while their rural neighbors are projected to be no longer "dry" due to higher rainfall. The overuse of air conditioners also emits heat into the urban heat islands, playing a significant role.

Source  : Princeton University

Annonce (Phys.org/news)

Page publiée le 29 juin 2021