Urban heat islands (UHI) occur due to the specific characteristics of urban areas, such as dark, paved surfaces, reduced vegetation, and increased human activity. This phenomenon contributes to localized temperature increases, making cities significantly hotter than surrounding rural areas.
Main factors contributing to the UHI effect include:
Heat Absorption: Dark surfaces like asphalt and concrete absorb more solar energy, increasing the temperature differences between cities and surrounding areas.
Loss of Green Space: Reduced vegetation decreases the natural cooling effect of evapotranspiration, further raising temperatures.
Increased Heat Emissions: Human activities, such as transportation and industry, emit heat, worsening the UHI effect.
Pollution and Poor Air Quality: Hotter cities retain higher concentrations of pollutants, worsening air quality and public health.
The UHI effect leads to greater energy demands for cooling, which can increase CO₂ emissions, further exacerbating global warming. Mitigation strategies include increasing green spaces, using reflective materials, and enhancing energy efficiency, all of which can alleviate these localized effects and contribute to combating climate change.