Heat Domes

Published on 06 Apr 2025

A heat dome happens when an area of high-pressure traps warm air over a region for a long period of time. The longer the trapped air remains, the more the sun tries to heat it, resulting in warmer circumstances with each passing day. 

Causes of Heat Domes

• Change in Atmospheric Pressure: Heat waves arise when high pressure in the sky moves in and pushes warm air toward the ground. Heat rising from the ocean feeds this action, causing an amplification loop.

• Temperature Inversion: The accumulation of heat is facilitated by temperature inversion, which holds warmer air close to the surface.

• Climate Change: Global warming is contributing to the increased frequency and intensity of heat domes.

• Dry and Hot air areas: Large dry land masses, such as plains or deserts, where heat can build up and be trapped by high-pressure systems in the atmosphere, are more likely to see the formation of heat domes.

Effects of Heat Dome

• Human Health: Extended exposure to high temperatures may result in heat-related ailments, such as heatstroke and exhaustion.

• Risk of Wildfires: The heat domes contribute to wildfires, which harm vast tracts of land in nations like the US each year.

• Worsened Air Quality: Heatwaves have the potential to worsen air quality because they promote the production of ground-level ozone and other pollutants.

• Example: More than 80 million people, largely from the Midwest to the east coast of US, were under air quality alerts due to Canadian wildfire.

• Urban Heat Island Effect: The urban heat island effect, in which cities have hotter temperatures than the nearby rural areas, can be made worse by heat domes.

• Example: Urban Heat Island effect experienced in Seattle.

Tags:
Environment

Keywords:
Heat dome Heat wave global warming Climate change

Syllabus:
General Studies Paper 3

Topics:
Environment and Climate Change