Combining Satellite Data and Spatial Analysis to Assess the UHI Amplitude and Structure within Urban Areas: The Case of Moroccan Cities


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Output type: Journal article

UM6P affiliated Publication?: Yes

Author list: El Ghazouani, Laila; Bounoua, Lahouari; Nigro, Joseph; Mansour, Majid; Radoine, Hassan; Souidi, Hanane

Publisher: MDPI

Publication year: 2021

Journal: URBAN SCIENCE (2413-8851)

Journal acronym: URBAN SCI

Volume number: 5

Issue number: 3

ISSN: 2413-8851

eISSN: 2413-8851

URL: https://www.mdpi.com/2413-8851/5/3/67

Languages: English (EN-GB)


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Abstract

Landsat-8 surface temperature and the European Space Agency land cover are used to assess the impact of land cover on the Urban Heat Island (UHI) and Urban Heat Sink (UHS). We analyzed five Moroccan cities selected for their different local climate, size, and typology during summer at three different spatial scales. The results show multiple causes defining the different forms and amplitudes of the UHI, namely: the ambient climate, the proximity to the sea, the presence of landscaped areas, and the color of building roofs and walls. Contrary to what was expected, the vegetation was not systematically an island of coolness, either because of its typology or its irrigation status. In the coastal cities of Tangier and Casablanca, UHIs around 20 degrees C are observed on the seaside, whereas a UHS of up to 11 degrees C is observed between the city center and the southern periphery of Casablanca. A moderate amplitude UHI of 7 degrees C is formed in the mountainous city of Ifrane. For cities built in desert-like environments, well-defined UHSs between 9 degrees C and 12 degrees C are observed in Smara and Marrakech, respectively. At a finer scale, towns recorded lower temperatures than their immediate surroundings, which are attributed to evaporation from irrigated plants.


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Last updated on 2021-02-12 at 23:21