Variations in the urban heat island intensity affected by geographical environments

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  • 3.56 MB
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  • English
by
Environmental Research Center, University of Tsukuba , Ibaraki, Japan
StatementHye-Sook Park.
SeriesEnvironmental Research Center papers,, no. 11
Classifications
LC ClassificationsMLCM 91/09025 (G)
The Physical Object
Pagination79 p. :
ID Numbers
Open LibraryOL2120441M
LC Control Number88178455

Variations in the urban heat island intensity affected by geographical environments.

Details Variations in the urban heat island intensity affected by geographical environments PDF

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Variations in the urban heat island intensity affected by. Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link) https Author: Park Hye-Sook. Heat islands are uneven in their spatial distribution and magnitude, especially during daytime and can vary based on the space configuration and urban features in smaller scales (Erell, ).Figure 1 illustrates that the magnitude of urban–rural temperature differences is usually reported to be higher at night time; Thus, (Arnfield,Runnalls and Oke, ).Cited by: Surface urban heat island intensity variations estimated by satellite-derived land surface temperature products, Quantifying the effects of settlement size on urban heat islands in fairly uniform geographic areas, Habitat International, /tint, 49, (), ().Cited by: The magnitude of the urban heat and cool islands depends on latitude (solar angle), the size of the buildings, anthropogenic heat generation in the urban area, and the different factors that govern the formation of the boundary layers.

The values presented in figure are in line with those measured for the city of London. As mentioned. Although the urban heat island in Hong Kong has been widely investigated, there is no consensus on the most appropriate fixed point meteorological sites to be used to calculate heat island intensity.

Urban Heat Island Intensity in London: An investigation of the impact of Geographical variation is controlled by classifying the data into core, urban and semi urban areas. Maximum daytime UHI of and geographical variables in different environments, it is important to control seasonal and geographical variables as much as possible to.

Description Variations in the urban heat island intensity affected by geographical environments PDF

An urban heat island, or UHI, is a metropolitan area that's a lot warmer than the rural areas surrounding it. Heat is created by energy from all the people, cars, buses, and trains in big cities like New York, Paris, and London.

Urban heat islands are created in areas like these: places that have lots of activity and lots of people. There are many reasons for UHIs. Variables that appear to influence the UHI included latitude and elevation; climate characteristics, surface morphology, vicinity to bodies of water, distance from industrial sites, urbanization.

Park HS () Variations in the urban heat island intensity affected by geographical environments, Environmental Research Center Papers University of Tsukuba, Ibaraki Google Scholar Parlow E () Net radiation of urban areas. 1. Introduction. Urban areas show higher temperature than the surrounding rural areas, which is well known as Urban Heat Island (UHI) effect.

Since its first observation by Howard in London (Mills, ), UHI phenomenon has been widely reported in different sized cities (e.g.

Arnfield,Zhang et al.,Zhou et al., ).Warmer air caused by UHI increases heat load stress of urban. Land surface characteristics directly relate to the surface the urban heat island (UHI) [5,6].

Recent evidence suggests that desert cities, unlike cities in temperate zones, often show a UHI effect, inverting the urban heat island phenomenon, with the result that specific urban areas appear colder than suburban areas during the daytime [7,8].

The urban heat island (UHI) phenomenon generally refers to the higher temperature in cities or urban areas than in surrounding areas. UHI conditions increase the risk of climatic and biophysical hazards in urban environments including heat stress and heighten acute and chronic exposure to air pollutants (EPA, ).

Heat islands are influenced by a city’s geographic location and by local weather patterns, and their intensity changes on a daily and seasonal basis. The warming that results from urban heat islands over small areas such as cities is an example of local climate change.

Urban heat island (UHI) intensity is explained according to one temporal model using meteorological variables. Temperature spatial variations are explained from two models using geographical informations averaged in a m radius buffer circle. The first one represents the mean UHI value for a given location, the second the variability.

The urban heat island (UHI) effect, a well-known phenomenon in which urban environments retain more heat than nearby rural environments, has a profound effect on the quality of life of the world's growing urban population. In addition to driving energy consumption, it impacts water quality, increases air pollution, and exacerbates public health.

With 81 percent of the U.S. population living in. Those artificial environments cause the temperature in urban area much higher than rural area.

It’s called Urban Heat Island, UHI. UHI was proposed by Luke Howard in (Landsberg, ). The Urban Heat Island Intensity (UHIs), which is the temperature difference between urban and rural, has been used to measure the intensity of UHI in general.

Ecosystem, Vegetation Affect Intensity of Urban Heat Island Effect. The urban heat island effect can raise temperatures within cities as much as 5 C higher than the surrounding countryside. New data suggests that the effect is more or less pronounced depending on the type of landscape -- forest or desert -- the city replaced.

Geographic Information System (GIS), in order to calculate the maximum intensity of urban heat islands based on urban geometry data. The method-ology of this study stands on a theoretical-numerical basis (Oke’s model), followed by the study and selection of existing GIS tools, the design of the.

The urban heat island. The study shows that, the intensity of the UHI of the city of Kuala Lumpur is o C recorded on Sunday 26 December (Map. 4 & 5 below). On the other hand, from previous studies, the intensity of the urban heat island of city of Kuala Lumpur in was ºC.

Urban heat islands are a result of the physical properties of buildings and other structures, and the emission of heat by human activities. They are most pronounced on clear, calm nights; their strength depends also on the background geography and climate, and there are often cool islands in parks and less‐developed areas.

The surface urban heat island (SUHI) is described as the areas of relative warmth, where increased temperatures are a result of urban surfaces compared to the surrounding rural surfaces (Oke, ).

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SUHIs are most noticeable during the day, when urban heat intensity is greatest, and are typically measured by thermal remote sensors (Voogt et al. More than half of the world’s population now live in cities, which are known to be heat islands.

While daytime urban heat islands (UHIs) are traditionally thought to be the consequence of less evaporative cooling in cities, recent work sparks new debate, showing that geographic variations of daytime UHI intensity were largely explained by variations in the efficiency with which urban and.

“urban heat island intensity” (DT u-r). The intensity of the heat island is mainly determined by the thermal balance of the urban region and can result in a tempera-ture difference of up to 10 degrees (Asimakopoulos et al., ). As shown in Figure 2, the heat island intensity.

The results show further intensification of the nocturnal heat island and higher ozone concentrations that are most pronounced in summer. These changes reflect sensitivity to variations in regional climate alone, so omit other factors such as changes in land use, emissions, climate feedbacks, or synergies between air quality and heat islands.

Urban areas, are estimated to include almost 54% of the world’s total population, are drawing a great deal of interest on the study on the urban heat island phenomenon in these cities, and, accordingly, mitigation technologies.

The variation analysis of the surface urban heat island intensity (SUHII) is important for understanding the effect of urbanization and urban planning. The objective of this study was to present a new strategy based on the Shannon’s entropy and Pearson chi-square statistic to investigate the spatial and temporal variations of the SUHII.

and intensity of heat islands at Visakhapatnam, the tropical coastal city of South India. A detailed study was carried out with regard to urban heat islands for the last ten years. The study reveals that the intensity of heat island varies from 2 0C to 4 C and intensity is high during winter season compared to summer and monsoon seasons.

Another major influencing factor when it comes to urban heat islands is how much of the city and areas around it are covered by greenery, trees, and other vegetation. Green spaces and forests absorb solar radiation but to lesser degrees than impervious surfaces, making the temperature differential between urban and rural areas greater.

EPA's Heat Island Effect Site provides information on heat islands, their impacts, mitigation strategies, related research, a directory of heat island reduction initiatives in U.S. communities, and EPA's Heat Island Reduction Program.Sabiha Sultana, A.

N. V. Satyanarayana, Impact of urbanisation on urban heat island intensity during summer and winter over Indian metropolitan cities, Environmental Monitoring and Assessment, /s,S3, ().Urban heat island studies have generally been conducted using air temperatures, and these have focused and Roth et al.

[7] showed that the UHI intensity is affected by artificial and environmental factors. Kim et al. [8] and different geographic and climatic environments.