Question
Explain the causes and mechanism of urban heat island effect. Discuss the strategies to minimize impacts of climate change on urban ecosystems.
Answer :
Word Count : 947
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Skip in 10
Urban heat island (UHI) effect is a phenomenon in which urban areas experience significantly higher temperatures than their surrounding rural areas. This temperature difference arises due to the concentration of human activities, built-up structures, and altered land surfaces in cities. The UHI effect is driven by multiple causes, both natural and anthropogenic, and involves complex mechanisms of heat absorption, storage, and release. One primary cause of UHI is the replacement of natural vegetation with impervious surfaces such as asphalt, concrete, and rooftops. These surfaces have higher heat capacities and thermal conductivities than soil or vegetation, absorbing and retaining solar radiation more efficiently during the day and releasing it slowly at night. As a result, urban areas maintain elevated temperatures even after sunset. Another contributing factor is the reduction of evapotranspiration due to limited vegetation. In natural landscapes, plants cool the environment by transpiring water, which absorbs heat during phase change. In cities, the scarcity of green spaces reduces this natural cooling effect, contributing to heat accumulation. The design and layout of urban structures further exacerbate the UHI effect. High-rise buildings, narrow streets, and dense building clusters create urban canyons that trap heat and limit airflow. This impedes natural ventilation, preventing heat dissipation and increasing local temperatures. Additionally, anthropogenic heat emissions from vehicles, industrial activities, air conditioning units, and power generation contribute directly to warming. These sources release significant amounts of heat into the urban atmosphere, compounding the effect of absorbed solar radiation. Moreover, the alteration of surface albedo in cities plays a key role. Dark-colored surfaces like asphalt and roofing materials absorb more sunlight compared to reflective surfaces, enhancing heat accumulation. The combination of high heat retention, limited cooling through evapotranspiration, and continuous anthropogenic
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