scholarly journals Heat island intensities over Brihan Mumbai on a cold winter and hot summer night

MAUSAM ◽  
2022 ◽  
Vol 52 (4) ◽  
pp. 703-708
Author(s):  
SHRAVAN KUMAR ◽  
THAKUR PRASAD ◽  
N. V. SASHIDHARAN ◽  
SUSHMA K. NAIR
Keyword(s):  
Temperature Distribution ◽  
Seasonal Changes ◽  
Similar Pattern ◽  
Sharp Contrast ◽  
Heat Island ◽  
Cold Winter ◽  
Heat Islands ◽  
Railway Tracks ◽  
Coastal Boundary ◽  
The City

A mobile temperature survey of Brihan Mumbai (Greater Bombay) was undertaken on 16 January 1997 which incidentally turned out to be the coldest winter night. Heat islands were found well inside the city, away from the coastal boundary, within a distinct tongue of warm air splitting in three branches roughly along the three sub- urban railway tracks. The finding of the study were in sharp contrast with similar studies conducted during the early seventies by Daniel and Krishnamurthy (1973) and later by Mukherjee and Daniel (1976). They found a remarkable influence of sea on the horizontal temperature distribution in comparison to other factors of urbanisation and noticed the heat island over Malabar Hill, Girgaurn and Cuffe Parade area. The survey conducted after a span of twenty-two years, showed that the temperature distribution in the city and suburbs has been modified significantly and that the effect of urbanisation has overtaken the effect of maritime influence in the formation and maintenance of heat islands. Another mobile temperature survey was conducted during the early hours of 11 May 1997 on the same lines as survey conducted on 16 January 1997, to confirm the findings of earlier survey and to assess seasonal changes in the intensities of heat island. This later survey showed similar pattern of horizontal temperature distribution, though the intensity of heat island observed was only 5.5° C as compared to 11.8° C observed during winter.

scholarly journals Urban heat island in Bloemfontein during winter

2013 ◽  
Vol 32 (1) ◽  
Author(s):  
Pieter Snyman ◽  
A. Stephen Steyn
Keyword(s):  
Maximum Intensity ◽  
Urban Heat Islands ◽  
Urban Air ◽  
Heat Island ◽  
Heat Islands ◽  
Air Temperatures ◽  
Local Topography ◽  
Urban Heat ◽  
The Difference ◽  
The City

Urban heat islands (UHIs) are characterised by warmer urban air temperatures compared to rural air temperatures, and the intensity is equal to the difference between the two. Air temperatures are measured at various sites across the city of Bloemfontein and then analysed to determine the UHI characteristics. The UHI is found to have a horseshoe shape and reaches a maximum intensity of 8.2 °C at 22:00. The UHI is largely affected by the local topography.

The Earth’s surface remote sensing methods used to explore heat islands in the city of Tyumen

2021 ◽  
Vol 977 (11) ◽  
pp. 40-50
Author(s):  
I.D. Akhmedova ◽  
L.D. Sulkarnaeva ◽  
N.V. Zherebyatieva ◽  
A.V. Petukhova
Keyword(s):  
Remote Sensing ◽  
Satellite Data ◽  
Landsat 8 ◽  
Heat Island ◽  
Heat Islands ◽  
Four Seasons ◽  
Remote Sensing Methods ◽  
The City

The authors present the results of mapping the “heat island” surface in the city of Tyumen and determining its spatial and seasonal manifestations using the Landsat-8 satellite data. Geothermic scenes of four seasons were obtained and analyzed

scholarly journals Relationships between Snow and the Wintertime Minneapolis Urban Heat Island

2011 ◽  
Vol 50 (9) ◽  
pp. 1884-1894 ◽  
Author(s):  
Steven B. Malevich ◽  
Katherine Klink
Keyword(s):  
Snow Cover ◽  
Urban Heat Islands ◽  
Heat Island ◽  
Cold Winter ◽  
Mixed Effect ◽  
Heat Islands ◽  
Hourly Temperature ◽  
Urban Heat ◽  
Urban Sites ◽  
Insulating Properties

AbstractUrban heat islands (UHIs) are one of the best-recorded incidences of anthropogenic climate change. Studies from across the globe have examined this phenomenon, but relatively few have focused on cold-winter cities and the effects of snow cover and snowfall. This study uses hourly temperature measurements from 1 December 2008 through 28 February 2009 at 22 urban sites in Minneapolis, Minnesota, to investigate the effect of snow cover and snowfall on the UHI. Snow effects on temperature are estimated for calm conditions using a linear mixed-effect (LME) model. For the winter of 2008/09, the average wintertime UHI was approximately 1.0°C, with a peak near midday rather than at night. The LME model results suggest that a snow cover of 5 cm or more increased the magnitude of the UHI by about 1.0°C during the day and by about 0.5°C at night. The model also indicates that the presence of moderate snowfall decreased the magnitude of the UHI by up to 2.0°C, although this result is based on a comparatively small number of events. The high albedo of snow is posited to contribute to the enhanced UHI during the day, and snow’s insulating properties are likely contributors to the characteristics of the nighttime UHI.

scholarly journals Variações Termo-Higrométricas e Estudo de Ilha de Calor Urbana na Cidade de Bragança-PA e Circunvizinhança (Thermo-Hygrometric Variations and Study of Urban Heat Island in the City of Bragança-PA and Surrounding Region)

2016 ◽  
Vol 9 (2) ◽  
pp. 571
Author(s):  
Abnoã Da Costa Costa ◽  
Hernani Rodrigues ◽  
Jefferson Costa ◽  
Paulo Souza ◽  
Joao Silva Junior ◽  
...  
Keyword(s):  
Air Temperature ◽  
Meteorological Parameters ◽  
Heat Island ◽  
Urban Centers ◽  
Heat Islands ◽  
Urban Heat ◽  
Relationship Of ◽  
The Relationship ◽  
The City

Estudou-se algumas variáveis e parâmetros meteorológicos no período de 17 a 21 de novembro de 2014, na cidade de Bragança-PA e circunvizinhança, com a finalidade de entender como elas interferem no microclima da cidade e com isso fazer um estudo com a finalidade de obter uma breve característica do microclima na região. Os resultados mostraram que houveram diferenças de temperaturas entre os pontos, ou seja, algumas características de cada local influenciaram no aumento ou diminuição da temperatura do ar. A relação dos dados com as características de uso e ocupação do solo demonstrou uma influência significativa onde havia vegetação, devido a diminuição da temperatura do ar noturna e, consequentemente, minimização das ilhas de calor. Foi verificado também que as áreas com maior ocupação com construções e com maior pavimentação perderam menos calor, levando à formação de pequenas ilhas de calor noturnas mais intensas. Assim percebeu-se que na cidade, bem como aquelas que passaram por processos de urbanização, segundo literatura, possuem ilha de calor, que consiste em temperaturas mais elevadas durante a noite, causando assim o desconforto humano. Com isso, as alterações microclimáticas na cidade de Bragança-PA, assim como em outros centros urbanos, em geral são causadas pela ação antrópica e que interferem na qualidade de vida da população. Este trabalho é importante para a publicação nesta revista devida a sua contribuição cientifica para a sociedade.     A B S T R A C T We studied some variables and meteorological parameters in the period from 17 to 21 November 2014 in the city of Bragança-PA and surrounding region, in order to understand how they impact on the city's microclimate and thus make a study for the purpose of get a brief characteristic of the microclimate in the region. The results showed that there were differences in temperature between the points, that is, some features of each local influence on the increase or decrease of air temperature. The relationship of the data with the characteristics of use and land cover showed a significant influence where there was vegetation, because influenced the decrease in the night air temperature and thus minimize heat islands. It was also found that the areas with higher occupancy with buildings and more paving lost less heat, leading to the formation of smaller more intense nocturnal heat islands. So it was noticed that in the city, as well as those who have gone through processes of urbanization, according to literature, have heat island, consisting of higher temperatures during the night, thus causing certain human discomfort. With that, the microclimate changes in the city of Bragança-PA, as well as other urban centers in general are caused by human activities that interfere with people's quality of life. This work is important for publication in the magazine due to their scientific contribution to society Keywords: Bragança-PA, heat island, air temperature.   

scholarly journals Análise de Microclimas na Cidade de Viçosa do Ceará: Abordagem na Perspectiva do Conforto Térmico (Analysis of the Microclimate in Viçosa Ceará: Approach in View of Thermal Comfort)

2012 ◽  
Vol 5 (1) ◽  
pp. 47 ◽  
Author(s):  
Filipe Da Silva Peixoto ◽  
Marta Celina Linhares Sales
Keyword(s):  
Thermal Comfort ◽  
Effective Temperature ◽  
Urban Climate ◽  
City Centre ◽  
Heat Island ◽  
Humid Climate ◽  
Heat Islands ◽  
Environmental Features ◽  
Different Types ◽  
The City

O estudo foi realizado na cidade de Viçosa do Ceará, cujas características geoambientais proporcionam um tipo climático de enclave úmido, ou seja, resulta em uma área de maior umidade e menor temperatura média isso devido ao efeito da altitude, em meio às áreas mais rebaixadas que configuram a depressão sertaneja, portanto, são áreas de condições geoambientais mais favoráveis ao conforto térmico. Buscou-se nos pontos de análise a distinção de diferentes tipos de uso e ocupação do solo, associado às características naturais que causam diferentes microclimas intraurbanos. Esses foram analisados através do levantamento de dados de temperatura do ar, temperatura efetiva, umidade do ar, e altitude. O levantamento foi realizado entre às 08 e 17 horas no dia 29 de outubro de 2009, período de primavera no hemisfério sul, correspondente ao período quente e seco no nordeste setentrional.  Os dados foram tratados de forma a evidenciar os diferentes microclimas qualitativa e espacialmente, através de gráficos comparativos e mapa de isolinhas de temperatura efetiva. Foi observado que sob o efeito das ilhas de calor, identificadas nos pontos dois (Centro da Cidade) e três (Praça do Coreto), a atmosfera do local se comporta de maneiras distintas, e esses pontos caracterizaram-se pela conservação de temperatura efetiva de 26 ºC às 15 horas, quando em condições normais essa temperatura tenderia a um decréscimo maior, situação observada nos demais pontos ambos com 24,8 ºC às 15 horas. A atmosfera da cidade de Viçosa do Ceará sofre o fenômeno da ilha de calor, que se mostra no espaço onde o uso e ocupação do solo são mais intensificados.   Palavras- chaves: Clima urbano. Viçosa do Ceará. Espaço Urbano.   Analysis of the Microclimate in Viçosa Ceará: Approach in View of Thermal Comfort   ABSTRACTThe study was conducted in Viçosa do Ceará, whose geo-environmental features provide a kind of enclave humid climate, which in the state of Ceará is configured as an area of ​​geo-environmental conditions more favorable for thermal comfort. Sought on the points of analysis to distinguish different types of land use and land cover, associated with natural features that cause different microclimates in space city. These were analyzed using the survey data of air temperature, actual temperature, humidity, and altitude. The survey was conducted between at 08 and 17 hours on October 29, 2009, the data were treated to highlight the qualitatively different microclimates and spatially, through graphs and comparative map of isolines of effective temperature. We note that under the effect of heat islands, identified in section 2 (City Centre) and 3 (Square Bandstand), the atmosphere of the site behaves differently, and these points were characterized by the conservation of effective temperature of 26 C for 15 hours, when this temperature under normal conditions would tend to a larger decrease observed in the other two points to 24.8 º C at 15 hours. The atmosphere of the city of Viçosa do Ceará suffers the heat island phenomenon, which appears in the space where the use and occupation are more intensified. Keywords: Urban climate. Viçosa- Ce. Space Urban. 

scholarly journals Analysis of the urban heat island in representative points of the city of Bayeux / PB

2018 ◽  
Vol 7 (6) ◽  
pp. 345
Author(s):  
Amanda Mayara Paulino Da Silva
Keyword(s):  
Land Use ◽  
Urban Heat Island ◽  
Thermal Field ◽  
Urban Climate ◽  
Urban Heat Islands ◽  
Heat Island ◽  
Thermal Discomfort ◽  
Heat Islands ◽  
Urban Heat ◽  
The City

Abstrat Urban growth has generated several socio-environmental problems and has altered the quality of life of people living in these environments. Due to the disorderly growth of cities and the various forms of urban land use and occupation, changes in the thermal field of these areas have occurred and caused the formation of urban heat islands and thermal discomfort in urban environments. Thus, the need to understand the formation of heat islands in these areas and the study of their causes and consequences grows. Given this context, the present work intends to study the urban climate of the city of Bayeux / PB, specifically the urban thermal field, and the formation of heat islands. For the accomplishment of the research, initially a bibliographical survey of the subject in question was made. Subsequently experimental points of meteorological data collection (temperature and relative air humidity) were defined in the metropolitan area of the city of João Pessoa, specifically in the municipality of Bayeux / PB. These points were defined based on the different types of land use and cover in the study area. The following experimental points were defined: a point in the center of the city of Bayeux / PB, another point on the banks of the BR230 direction Bayeux, and a reference point in a remnant of Atlantic forest. To obtain the urban heat island the reference point was used as a parameter of the climatic conditions of a natural environment. The data of temperature and relative humidity were collected through thermometers (HOBO U-10), which were placed on steel tripods (1.5 meters high) and monitored at uninterrupted intervals of 1 and 1 hour during the dry period and rainy region. The analysis of the data points to the formation of urban heat islands in the two periods evaluated in the city of Bayeux / PB, being the center of the city, the most critical area with the most intense heat islands. The vegetative cover played a predominant role in the climatic mitigation of the experimental samples as well as the presence of precipitation. The areas with impermeable soil cover presented the largest heat islands and contributed to the thermal discomfort of the study area. Keywords: Urban Climate, Thermodynamic Field, Urban Heat Island.

scholarly journals Ilhas de calor urbano em cidade do semiárido nordestino

GeoTextos ◽  
2020 ◽  
Vol 16 (2) ◽  
Author(s):  
Juliana Maria Oliveira Silva ◽  
Marcelo De Oliveira Moura ◽  
Vinicius Ferreira Luna
Keyword(s):  
Data Collection ◽  
Air Temperature ◽  
Urban Climate ◽  
Temperature Data ◽  
Urban Heat Islands ◽  
Heat Island ◽  
Heat Islands ◽  
Intensity Category ◽  
Urban Heat ◽  
The City

<p>A pesquisa pautou-se nas concepções do Sistema Clima Urbano de Monteiro (1976) e procurou identificar e mapear as ilhas de calor urbano na cidade do Crato-CE, em dois períodos sazonais do ano. Para isso, foram selecionados 10 pontos experimentais distribuídos em bairros na zona urbana da cidade, e aferiram-se dados de temperatura do ar com termohigrômetros instalados em abrigos meteorológicos durante os meses de abril (mês chuvoso) e outubro (mês seco). A partir da coleta de dados, a categoria predominante de intensidade das Ilhas de Calor intra e interurbana para a cidade do Crato foi o de ‘Média magnitude’. O horário que ocorre a maior intensidade da ilha de calor é pela tarde, 14h, com valores superiores a 5ºC de diferença de um local para o outro. Os bairros mais densamente ocupados e com baixa cobertura vegetal apresentaram os maiores valores de temperatura, enquanto que, nos que se localizam mais próximos da encosta da chapada e com vegetação mais densa, ocorreram as temperaturas mais amenas.</p><p>Abstract</p><p>URBAN HEAT ISLANDS IN CITY OF THE NORTHEAST SEMIARID</p><p>The research was based on the conceptions of the Monteiro Urban Climate System (1976) and sought to identify and map the urban heat islands in the city of Crato/ Ce in two seasonal periods of the year. For this, 10 experimental points were selected and distributed in neighborhoods in the urban area of the city and air temperature data was measured with thermohygrometers installed in meteorological shelters during the months of April (rainy month) and October (dry month). From the data collection, the predominant intensity category of the intra and interurban Heat Islands for the city of Crato was that of ‘Medium magnitude’. The time that occurs the greatest intensity of the heat island is in the afternoon, 14h, with values above 5ºC of difference from one place to another. The most densely occupied neighborhoods and with low vegetation cover had the highest temperature values, while those located closer to the slope of the plateau and with more dense vegetation, the milder temperatures occurred.</p>

scholarly journals The influence of city planning on the emergence of heat islands in megacities with a tropical climate (Hanoi)

Vestnik MGSU ◽  
2019 ◽  
pp. 148-157 ◽  
Author(s):  
Le Minh Tuan
Keyword(s):  
Surface Temperature ◽  
Green Space ◽  
Tropical Climate ◽  
Town Planning ◽  
Green Spaces ◽  
Heat Island ◽  
Rapid Urbanization ◽  
Heat Islands ◽  
Urban Heat ◽  
The City

Introduction. Rapid urbanization causes critical changes in global, as well as changes in earth surface temperature. The transformation of land use purposes significantly affects the surface temperature and exacerbates the effect of the negative heat island. Therefore, it is important to conduct a study to optimize urban cooling. Gives town-planning recommendations for limiting the negative impact of urban heat islands (UHI) on human. Analyzing urban and suburban planning in the city of Hanoi, the author proposes the use of certain town-planning principles that contribute to reducing the effect UHI. Materials and methods. This study is focused on green space using as a means of combating environmental problems due to the effect of urban heat island and creating a favorable urban ecological environment. The definition of the relationship between the ratio of green spaces and a decrease in temperature is given. The analysis was taken from 21 green spaces of the city of Hanoi. Results. The study showed a relationship between the intensity of heat reduction and the shape indicator of green space - a linear inverted system and the positive effect of the green zone on reducing the effects of heat island. Conclusions. One of the most important tasks of a city planner is the placement and adjustment of industrial zones of the city, the main transport arteries of the city, meaning that the placement and planning of industrial, residential and public territories, and also the system of roads depends on the formation of “heat islands”, which in the tropical climate of Vietnam, adversely affects human health.

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