323
© The Author(s) 2016
F. Musco (ed.), Counteracting Urban Heat Island Effects in a Global Climate
Change Scenario, DOI 10.1007/978-3-319-10425-6_12
Chapter 12
Urban Heat Island in the Ljubljana City
Blaž Komac , Rok Ciglič , Alenka Loose , Miha Pavšek , Svetlana Čermelj ,
Krištof Oštir , Žiga Kokalj , and Maja Topole
Abstract Ljubljana made the fi rst climate mapping of the city in 2000, putting the
differences in terms of UHI effects between the inner part of the city and the surrounding areas are quite evident. An effi cient planning of city infrastructure takes
into account increasing average temperatures in a city, and therefore provides solution to reduce and monitor the effect of its urban heat island. The chapter presents
the urban heat island in the Ljubljana region, temperature modelling based on satellite data and UHI project pilot actions in the Ljubljana city.
Keywords Urban heat island • Urban heat island atlas • Satellite termography measurements • Pilot actions • Ljubljana • Slovenia
12.1 Introduction
Urban heat island is an urban area where temperatures are higher than in the surrounding area. This is mainly due to the accumulation of heat in buildings, concrete
and asphalt land during the day. This leads to a greater night long wave radiation
from the surface and thus to a smaller cooling than the surroundings (Žiberna 2006).
The city also has lower albedo, greater diffuse solar radiation due to pollution,
reduced evapotranspiration and lower relative humidity which infl uences quality of
life (Ravbar et al. 2005 ; Tiran 2016 ).
B. Komac (*) • R. Ciglič • M. Pavšek • M. Topole
Anton Melik Geographical Institute ZRC SAZU , Novi trg 2, 1000 , Ljubljana , Slovenia
e-mail: blaz.komac@zrc-sazu.si
A. Loose
Energy Manager of the City of Ljubljana , City of Ljubljana ,
Adamič-Lundrovo nabrežje 2, 1000 , Ljubljana , Slovenia
S. Čermelj
Department of Environmental Protection , City of Ljubljana ,
Zarnikova 3, 1000 , Ljubljana , Slovenia
K. Oštir • Ž. Kokalj
Institute of Anthropological and Spatial Studies ZRC SAZU ,
Novi trg 2, 1000 , Ljubljana , Slovenia
© The Author(s) 2016
F. Musco (ed.), Counteracting Urban Heat Island Effects in a Global Climate
Change Scenario, DOI 10.1007/978-3-319-10425-6_12
Chapter 12
Urban Heat Island in the Ljubljana City
Blaž Komac , Rok Ciglič , Alenka Loose , Miha Pavšek , Svetlana Čermelj ,
Krištof Oštir , Žiga Kokalj , and Maja Topole
Abstract Ljubljana made the fi rst climate mapping of the city in 2000, putting the
differences in terms of UHI effects between the inner part of the city and the surrounding areas are quite evident. An effi cient planning of city infrastructure takes
into account increasing average temperatures in a city, and therefore provides solution to reduce and monitor the effect of its urban heat island. The chapter presents
the urban heat island in the Ljubljana region, temperature modelling based on satellite data and UHI project pilot actions in the Ljubljana city.
Keywords Urban heat island • Urban heat island atlas • Satellite termography measurements • Pilot actions • Ljubljana • Slovenia
12.1 Introduction
Urban heat island is an urban area where temperatures are higher than in the surrounding area. This is mainly due to the accumulation of heat in buildings, concrete
and asphalt land during the day. This leads to a greater night long wave radiation
from the surface and thus to a smaller cooling than the surroundings (Žiberna 2006).
The city also has lower albedo, greater diffuse solar radiation due to pollution,
reduced evapotranspiration and lower relative humidity which infl uences quality of
life (Ravbar et al. 2005 ; Tiran 2016 ).
B. Komac (*) • R. Ciglič • M. Pavšek • M. Topole
Anton Melik Geographical Institute ZRC SAZU , Novi trg 2, 1000 , Ljubljana , Slovenia
e-mail: blaz.komac@zrc-sazu.si
A. Loose
Energy Manager of the City of Ljubljana , City of Ljubljana ,
Adamič-Lundrovo nabrežje 2, 1000 , Ljubljana , Slovenia
S. Čermelj
Department of Environmental Protection , City of Ljubljana ,
Zarnikova 3, 1000 , Ljubljana , Slovenia
K. Oštir • Ž. Kokalj
Institute of Anthropological and Spatial Studies ZRC SAZU ,
Novi trg 2, 1000 , Ljubljana , Slovenia