scholarly journals Characterization of the urban heat island at Bucaramanga, Colombia, using real-time temperature monitoring

2019 ◽  
Author(s):  
Hildreth Jadira Villamil-Almeida ◽  
Kevin Andrés Blanco-Mantilla ◽  
Oscar Yazit Salah-García ◽  
Carlos Eduardo García Sánchez
Keyword(s):  
Urban Heat Island ◽  
Real Time ◽  
Mean Value ◽  
Heat Island ◽  
Local Climate ◽  
Urban Heat ◽  
The City ◽  
Local Climate Zone ◽  
Meteorological Effects

One of the meteorological effects in cities is the increase in local temperature, which is known as urban heat island (UHI). The objective of this study was to detect and quantify the possible UHI in the city of Bucaramanga, Colombia. For this purpose, a real-time temperature measurement network was installed, composed of seven nodes, used to obtain temperature values every minute. Six of the nodes were located in different positions in the city, and the remaining one was used to give the reference measurement. The data collected were processed for elimination of outliers, management of missing data and noise filtering. Analysis of the data allowed detecting differences in the diurnal and nocturnal UHI intensity trends. It was concluded that the UHI intensity during the day varies depending on the Local Climate Zone that represents the location, while the UHI intensity value at night is quite uniform across the city, with a mean value of 1.0 °C. It was also possible to conclude that the magnitude of the daytime UHI is lower in the dry season.

Climate Bubbles: Games to Monitor Urban Climate

Leonardo ◽  
2011 ◽  
Vol 44 (1) ◽  
pp. 64-65
Author(s):  
Drew Hemment ◽  
Carlo Buontempo ◽  
Alfie Dennen
Keyword(s):  
Urban Heat Island ◽  
Air Flow ◽  
Urban Climate ◽  
Heat Island ◽  
Local Climate ◽  
Flow Circulation ◽  
Urban Heat ◽  
The City

Climate Bubbles was a playful, participatory mass observation project on local climate. Bubble blowing games were devised to enable people across the city of Manchester to test air flow circulation and, by sharing the results online, enabled the Met Office to create a snapshot of the effect the Urban Heat Island has on wind.

scholarly journals Analysis of Urban Heat Island in Kochi, India, Using a Modified Local Climate Zone Classification

2014 ◽  
Vol 21 ◽  
pp. 3-13 ◽  
Author(s):  
George Thomas ◽  
A.P. Sherin ◽  
Shareekul Ansar ◽  
E.J. Zachariah
Keyword(s):  
Urban Heat Island ◽  
Heat Island ◽  
Climate Zone ◽  
Local Climate ◽  
Urban Heat ◽  
Local Climate Zone

scholarly journals Investigations of Surface Urban Heat Island Effect Based on Local Climate Zone Method: A Case of Xi'an

2019 ◽  
Vol 136 ◽  
pp. 05011
Author(s):  
Kaikai Mu ◽  
Yan Liu ◽  
Moyan Zhang ◽  
Bing Han ◽  
Liu Yang
Keyword(s):  
Land Cover ◽  
Urban Heat Island ◽  
Urban Form ◽  
Heat Island ◽  
Zone Method ◽  
Climate Zone ◽  
Local Climate ◽  
Urban Heat ◽  
Surface Urban Heat Island ◽  
Local Climate Zone

Urbanization seriously affects the urban climate and the quality of human settlement. Based on Landsat8 remote sensing and building vector data, local climate zone (LCZ) method is employed to study the influences of urban form on land surface temperature (LST) of Xi'an. The results confirmed that the LST of the built-up LCZ is higher than the land cover LCZ. In built-up LCZ, LST is increasing with the increasing of building density. In land cover LCZ, the LST of bare land is the highest. Surface urban heat island (SUHI) of 14 samples in LCZ also been calculated. Highest SUHI intensity is found in low-rise buildings with high density area. LST intensity of water body and forest are lower than others in land cover LCZ.

scholarly journals Studying the Urban Heat Island Using a Local Climate Zone Scheme

2016 ◽  
Vol 25 (6) ◽  
pp. 2609-2616 ◽  
Author(s):  
Zhihao Wang ◽  
Wu Xing ◽  
Yi Huang ◽  
Tongan Xie
Keyword(s):  
Urban Heat Island ◽  
Heat Island ◽  
Climate Zone ◽  
Local Climate ◽  
Urban Heat ◽  
Local Climate Zone

Human thermal comfort in Local climate zones of Berlin

2020 ◽  
Author(s):  
Ines Langer ◽  
Alexander Pasternack ◽  
Uwe Ulbrich
Keyword(s):  
Thermal Comfort ◽  
Urban Heat Island ◽  
Urban Areas ◽  
Heat Island ◽  
Climate Zones ◽  
Local Climate ◽  
Human Thermal Comfort ◽  
Local Climate Zones ◽  
Urban Heat ◽  
The City

<p>Urban areas show higher nocturnal temperature comparing to rural areas, which is denoted by urban heat island. This effect can intensify the impact of global warming in urban areas especially during heat waves, that leads to higher energy demand for cooling the building and higher thermal stress for residents.  </p><p>The aim of this study is to identify the Urban Heat Island (UHI) effect during the heat spell 2018 and 2019 in order to calculated human thermal comfort for Berlin. Berlin, the capital city of Germany covers an area of 892km<sup>2</sup> and its population is growing, therefore more residential areas will be planned in future through higher building. The methodology of this research is to divide Berlin into Local Climate Zones (LCZ's) regarding the concept of Stewart & Oke (2012). Then to evaluate the accuracy of this concept using 30 microclimate stations. Estimating the magnitude of urban heat island and its seasonal changes in combination with human thermal perception in different LCZ during summer time is another objective of this research. </p><p>Ten LCZ's for Berlin were selected, as class 1 (compact high rise), class 3 (compact low rise), class 7 (lightweight low-rise), class C (bush, scrub), class E (bare rock or paved) and class F (bare soil or sand) don't exist in Berlin. Class A (dense trees) is with a fraction of 18.6% in a good agreement with the percentage of dense trees reported from the city administration of Berlin (18.4%), class G (water) has a coverage of 5.1% through our classification instead of 6.7% reported by the city administration. In summary, the LCZ 1-10 cover 59.3% (more than half) of the city area.</p><p>Regarding temperature measurements, which represent a hot summer day with calm wind and clear sky the difference of Local Climate Zones will be calculated and the temperature variability in every LCZ's regarding sky view factor values show the hot spot of the city.</p><p>The vulnerability of LCZ's to heat stress will be ranked and discussed regarding ventilation and other factors.</p><p> </p><p>Literature</p><p>Matzarakis, A. Mayer, H., Iziomon, M. (1999) Applications of a universal thermal index: Physiological equivalent temperature: Intern. J. of Biomet 43 (2), 76-84.</p><p>Stewart, I.D., Oke, T.R. (2012) Local climate zones for urban temperature studies. Bull. Amer. Meteor. Soc. 93 1879-1900. DOI: 10.1175/BAMS-D-11-00019.1.</p><p> </p>

scholarly journals Analyzing the Characteristics of UHI (Urban Heat Island) in Summer Daytime Based on Observations on 50 Sites in 11 LCZ (Local Climate Zone) Types in Xi’an, China

2020 ◽  
Vol 13 (1) ◽  
pp. 83
Author(s):  
Yunwei Zhang ◽  
Jili Zhang ◽  
Xiaoqian Zhang ◽  
Dian Zhou ◽  
Zhaolin Gu
Keyword(s):  
Urban Heat Island ◽  
Urban Areas ◽  
High Surface ◽  
Tall Buildings ◽  
Heat Island ◽  
Climate Zone ◽  
Local Climate ◽  
Surface Fraction ◽  
Urban Heat ◽  
Local Climate Zone

Urbanization has induced significant changes on local climate in urban areas. For sustainable urban planning, it is necessary to identify the distribution characteristics of urban heat island (UHI) and the effects of land cover properties. In situ measurements are frequently carried out to obtain critical data in urban climate studies. However, long-time continuous observations on multiple sites are still rare, even though they would be useful in mapping the distribution of UHI intensity. In the current work, three observation campaigns were carried out in Xi’an, China. Pedestrian- level air temperatures (PLAT) were measured with potable micro-environment stations on 50 sites in 11 local climate zone (LCZ) types. The normalized PLAT was used to investigate the canopy layer UHI characteristics and the effects of LCZ types. Results revealed that the land coverage type and the surface structure have significant influence on the local climate. The PLAT in high-surface-fraction building covered areas was higher than that in low-surface-fraction building covered areas. In areas with similar building surface fraction, building height influences the UHI magnitude as well, as tall buildings would provide more shielding on the pedestrian level. The average UHI magnitude and the standard deviation within each LCZ type were calculated by statistical analysis of the observed results, which proved to be useful for UHI mapping based on the LCZ classification results in urban areas.

scholarly journals How urbanisation alters the intensity of the urban heat island in a tropical African city

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0254371
Author(s):  
Xueqin Li ◽  
Lindsay C. Stringer ◽  
Sarah Chapman ◽  
Martin Dallimer
Keyword(s):  
Urban Heat Island ◽  
Rural Areas ◽  
Urban Areas ◽  
Heat Island ◽  
African City ◽  
Local Climate ◽  
Urban Cluster ◽  
Urban Heat ◽  
Management Institutions ◽  
The City

Due to the combined effects of urban growth and climate change, rapid urbanisation is particularly challenging in African cities. Areas that will house a large proportion of the urban population in the future coincide with where natural hazards are expected to occur, and where hazard risk management institutions, knowledge, and capacity are often lacking. One of the challenges posed by rapid urbanisation is the Urban Heat Island (UHI) effect, whereby urban areas are warmer than the surrounding rural areas. This study investigates urbanisation patterns and alterations in surface UHI (SUHI) intensity for the Kampala urban cluster, Uganda. Analyses show that between 1995 and 2017, Kampala underwent extensive changes to its urban built-up area. From the centre of the city to adjoining non-built up areas in all directions, the urban land cover increased from 12,133 ha in 1995 to 25,389 ha in 2016. The area of SUHI intensity in Kampala expanded significantly over the 15-year period of study, expanding from 22,910 ha in 2003 to 27,900 ha in 2016, while the annual daytime SUHI of 2.2°C in 2003 had decreased to 1.9°C by 2017. Although SUHI intensity decreased in some parts of the city, elsewhere it increased, suggesting that urbanisation does not always lead to a deterioration of environmental conditions. We postulate that urban development may therefore not necessarily create an undesirable impact on local climate if it is properly managed. Rapidly growing cities in Africa and elsewhere should ensure that the dynamics of their development are directed towards mitigating potentially harmful environmental impacts, such as UHI effect through careful planning that considers both bluespaces and greenspaces.

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