Knowra Urban heat island Urban heat island An urban heat island is a built-up area that is warmer than its rural surroundings because surfaces, urban form, and human activity alter heat absorption and release.
Urban albedo : The fraction of incoming sunlight reflected by urban surfaces rather than absorbed. Dark roofs and pavement absorb more solar energy than many rural surfaces.
Urban heat island mitigation : Strategies that reduce excess urban warmth through changes to surfaces, vegetation, buildings, or energy use. It targets the physical causes of elevated city temperatures.
Heat wave : A prolonged period of unusually hot weather relative to a region’s climate. An urban heat island can intensify exposure during already dangerous hot spells.
Urban cool island : An urban area that is cooler than its rural surroundings under particular conditions. It is the opposite temperature pattern and can occur in some climates or at certain times.
Urban heat vulnerability : The degree to which people or communities are likely to be harmed by urban heat. Temperature alone does not show who lacks shade, cooling, or protection.
Thermal mass : A material’s capacity to absorb and store heat, then release it over time. Masonry and pavement store daytime warmth and release it after sunset.
Urban heat island intensity : The temperature difference between an urban area and a chosen rural reference area. This metric makes the heat island measurable, though results depend on comparison sites and timing.
Heat-related illness : Physical harm caused by excessive heat, ranging from heat cramps to heat stroke. Higher urban temperatures increase the risk of illness, especially at night.
Surface urban heat island : An urban heat island measured from the temperatures of roofs, roads, and other surfaces. It concerns surface temperatures, not necessarily the air people experience.
Environmental justice : The fair distribution of environmental benefits and harms and meaningful participation in related decisions. Heat exposure and access to cooling can differ sharply across neighborhoods.
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