SPATIAL CHARACTERISTICS OF THE LAND SURFACE TEMPERATURE IN BUCHAREST METROPOLITAN AREA

摘要

Land surface temperature (LST) is the key driving force in the exchange of radiation at the land surface/atmosphere interface and one of the foremost parameters in the physical processes of surface energy exchange locally and globally. Bucharest Metropolitan Area is a dynamic territory, subject to rapid urban growth, the continuous expansion of the city over wider territories beyond its outskirts, thus transposing the thermal characteristics of the new surfaces. For the current study, in order to obtain the LST, a series of Landsat-8 scenes were analyzed. In the case of Bucharest Metropolitan Area, the spatial distribution of LST shows a high concentration of areas more radiant in the urban areas with dense built-up surfaces. Industrial sites and compact residential neighborhoods are characterized by high temperatures contrasting with the green spaces and water surfaces that are “coolness islands”. The city’s heat island is obvious, but the small difference compared to the surrounding areas is explained by the expansion of the urban metropolitan area with various functions (e.g. services and commercial) in the neighboring urban-rural space. The analysis showed that for the urban space, the largest thermal input is associated with the strong anthropogenic surfaces such as industrial plants, transport infrastructure and facilities (e.g. depots, annexes), airports, followed by the residential areas. The lowest average temperatures belong to green and water covered areas.