A new approach to study the long-term urban heat island evolution using time-dependent spectroscopy

Urban Climate ◽  
2021 ◽  
Vol 40 ◽  
pp. 101026
Author(s):  
Svetlana A. Varentsova ◽  
Mikhail I. Varentsov
Keyword(s):  
Urban Heat Island ◽  
Time Dependent ◽  
Heat Island ◽  
New Approach ◽  
Island Evolution ◽  
Urban Heat

scholarly journals Historical Intimacy in Malay Urban Core Configurations: A Comparative Analysis

2020 ◽  
Vol 9 (2) ◽  
pp. e020
Author(s):  
Illyani Ibrahim ◽  
Shireen Jahn Kassim ◽  
Alias Abdullah
Keyword(s):  
Comparative Analysis ◽  
Urban Heat Island ◽  
Case Studies ◽  
Urban Design ◽  
Design Principle ◽  
Heat Island ◽  
Open Spaces ◽  
Urban Core ◽  
Urban Heat

This paper analyses the historical pre-Colonial configurations of a series of urban cores in Malay sites along the Straits of Melaka. The objective of this research is to identify the pattern and variations of each pre-Colonial royal urban core from the perspective of urban design principle such as “intimacy” and “walkability,” which can affect in a long term sustainable parameters such as the reduction of “urban heat island”. This traditional character is increasingly disappearing due to urbanisation. There is a difficulty to reconstruct the urban core of these case studies because of their past layouts’ degree of organic character, particularly in terms of randomness. This paper argues that such configurations reflect the degree of “intimacy,” which was ruptured during the Colonial eras. Patterns were identified using available maps and lithography related to the case studies. The findings indicate that the Malay royal urban core does obey the urban design principles of intimacy and walkability. The “intimacy indices” for a historical Malay city are as follow: distance from palace to mosque (170 metre), padang/open spaces (130 metre), settlement (310 metre), market (195 metre), and aristocrat houses (60 metre). This finding can be used to inform the baseline for the preparation of the Malay principles guidelines.

scholarly journals Satellite Based Analysis of Surface Urban Heat Island Intensity

2016 ◽  
Vol 9 (1-2) ◽  
pp. 23-30 ◽  
Author(s):  
Orsolya Gémes ◽  
Zalán Tobak ◽  
Boudewijn van Leeuwen
Keyword(s):  
Surface Temperature ◽  
Urban Heat Island ◽  
Urban Climate ◽  
Seasonal Development ◽  
Heat Island ◽  
Early Afternoon ◽  
Local Climate Zones ◽  
Urban Heat ◽  
Surface Urban Heat Island

Abstract The most obvious characteristics of urban climate are higher air and surface temperatures compared to rural areas and large spatial variation of meteorological parameters within the city. This research examines the long term and seasonal development of urban surface temperature using satellite data during a period of 30 years and within a year. The medium resolution Landsat data were (pre)processed using open source tools. Besides the analysis of the long term and seasonal changes in land surface temperature within a city, also its relationship with changes in the vegetation cover was investigated. Different urban districts and local climate zones showed varying strength of correlation. The temperature difference between urban surfaces and surroundings is defined as surface urban heat island (SUHI). Its development shows remarkable seasonal and spatial anomalies. The satellite images can be applied to visualize and analyze the SUHI, although they were not collected at midday and early afternoon, when the phenomenon is normally at its maximum. The applied methodology is based on free data and software and requires minimal user interaction. Using the results new urban developments (new built up and green areas) can be planned, that help mitigate the negative effects of urban climate.

scholarly journals COMPREHENSIVE ANALYSIS OF URBAN THERMAL ENVIRONMENT – A CASE STUDY OF QINGDAO，CHINA

2020 ◽  
Vol XLIII-B3-2020 ◽  
pp. 119-123
Author(s):  
Y. Liu ◽  
J. Qi ◽  
G. Wang ◽  
J. Wang
Keyword(s):  
Urban Heat Island ◽  
Spatial Planning ◽  
Thermal Environment ◽  
Land Development ◽  
Landsat 8 ◽  
Heat Island ◽  
Thermal Infrared Remote Sensing ◽  
Island Evolution ◽  
Urban Heat ◽  
Urban Thermal Environment

Abstract. The thermal environment is an important part of spatial planning of national land. It can be inverted by thermal infrared remote sensing image data. Qingdao is an important coastal city in China which is effected by the urban heat island. The driving factors of urban thermal environment in Qingdao are analysed by using Landsat 8 OLI/TIRS images, DMSP/OLS data, ZY-3 images, statistical data et al. Firstly, the urban heat island information in different periods are retrieved by Landsat8 TIRS by the surface temperature. On this basis, the coupling analysis of the characteristics of vegetation cover, water, land use type, night light, urban impervious surface, transportation, change density and other factors that related to spatial planning of national land and the change of thermal environment is completed from two dimensions of time and space. At the same time, according to the spatial distribution of the heat island evolution, with the aim of improving the thermal environment and optimizing the urban spatial layout of Qingdao, the paper puts forward reasonable suggestions and improvement strategies, and provides basic reference data for the development of urban heat island governance and land development and utilization.

scholarly journals Global long-term mapping of surface temperature shows intensified intra-city urban heat island extremes

2021 ◽  
Author(s):  
Lorenzo Mentaschi ◽  
Gregory Duveiller ◽  
Grazia Zulian ◽  
Christina Corbane ◽  
Martino Pesaresi ◽  
...  
Keyword(s):  
Heat Stress ◽  
Surface Temperature ◽  
Urban Heat Island ◽  
Urban Areas ◽  
Human Impacts ◽  
Warm Season ◽  
Mitigation Strategies ◽  
Heat Island ◽  
Urban Heat

Abstract Surface temperatures are generally higher in cities than in rural surroundings. This phenomenon, known as surface urban heat island (SUHI), increases the risk of heat-related human illnesses and mortality. Past global studies analysed this phenomenon aggregated at city scale or over seasonal and annual time periods, while human impacts strongly depend on shorter term heat stress experienced locally. Here we develop a global long-term high-resolution dataset of daytime SUHI as urban-rural surface temperature differences. Our results show that across urban areas worldwide over the period 2003-2020, 3-day SUHI extremes are on average more than twice as high as the warm-season median SUHI, with local exceedances up to 10 K. Over this period, SUHI extremes have increased more rapidly than warm-season medians, and averaged worldwide are now 1.04 K or 31% higher compared to 2003. This can be linked with increasing urbanisation, more frequent heatwaves, and greening of the earth, processes that are all expected to continue in the coming decades. Within many cities there are hotspots where extreme SUHI intensity is 10 to 15 K higher compared to relatively cooler city parts. Given the limited human adaptability to heat stress, our results advocate for mitigation strategies targeted at reducing SUHI extremes in the most vulnerable and exposed city neighbourhoods.

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