To Investigate The Urban Heat Island Of Guangzhou

This paper examined the Urban Heat Island (UHI) phenomenon in Guangzhou which is the center of commercial and manufacturing in southern China. Research and original field survey was conducted by Fleur Wang, a 6th grade student at the British School in Guangzhou. In the field survey, we use two sectional views to measure the temperature difference between the city's SW - NE and E - W profiles. Urban land use was also studied using Landsat satellite imagery. The results showed that the temperature of high-density urban urban areas rose and the rural vegetation coverage rate decreased.

Over the years, the existence of urban heat island has raised concern. When heat is generated and maintained in industrial areas and urban areas, urban heat islands are formed. Most of the solar energy reaching rural areas is consumed by vegetation and evaporation of moisture from the soil. In the city, the vegetation is small, the soil is exposed, and most of the solar energy is absorbed by buildings and asphalt, so the surface temperature increases. Automotive, factory, industrial and domestic air conditioners emit more heat. Therefore, the temperature in the city is usually 1 to 3 ° C higher than the temperature of the surrounding landscape. Impacts include a reduction in soil moisture and a reduction in resorption of carbon dioxide emissions.

Urban heat islands are characterized by hot bubbles that fuse the affected areas of the city. However, for a more general understanding, when referring to the city heat island effect, it is usually as a temperature difference or comparison between the air inside the city canopy during the day and night and the outskirts or rural areas of the residential area It is represented. The temperature difference between the two areas is unique to each settlement, which is highly dependent on the region's climate and city shape. The same rule also applies to the warmth of urban areas at night compared to daytime. As a general estimate, the temperature of the city is 2 to 12 degrees higher than the rural area in the suburbs and surroundings, but the temperature is said to be that much higher. Therefore, the annual average temperature may be 1 ° C to 5 ° C higher than the surrounding air temperature.