Effect of an urban park on air temperature differences in a central business district area

Lee, Sang-Hwa; Lee, Kyoo-Seock; Jin, Wen-Cheng; Song, Huacan

doi:10.1007/s11355-009-0067-6

Cited by 83 publications

(38 citation statements)

References 11 publications

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“…Yokobori and Ohta (2009), Lee et al (2009) and Bowler et al (2010) also showed that the influence of vegetation on air temperature was bigger during the night. None of them refer to cooling by evapotranspiration.…”

Section: Phase 1 -Site-dependent Coolingmentioning

confidence: 91%

Evening evapotranspirative cooling in relation to vegetation and urban geometry in the city of Ouagadougou, Burkina Faso

Holmer

Thorsson

Lindén

2012

Intl Journal of Climatology

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Intra-urban cooling in the city of Ouagadougou, capital of Burkina Faso in the Sahel zone of West Africa, was studied during the dry seasons in 2003, 2004 and 2007. The aim was to see how vegetation, built structure and position within the built-up area influenced the nocturnal cooling. Cooling was divided into two phases. In Phase 1 (16 : 00-20 : 00 hours LST = CET), cooling was very different between the sites while in Phase 2 (20 : 00-06 : 00 hours LST), cooling rates differed insignificantly and the whole area cooled almost at the same rate. Thus the temperature differences between the sites developed during these few hours in Phase 1 were preserved during the rest of the night. In Phase 1, Evening Evapotranspirative Cooling was intensive at vegetated sites that cooled almost twice as fast as sparsely vegetated. This was indicated by a humidity rate (increase of specific humidity per hour) that was high at a vegetated site, but considerably lower at a sparsely vegetated. In Phase 2 the humidity rate was slightly negative with little difference between the sites. After a division in vegetated and sparsely vegetated sites built structure (sky view factor) were shown to influence cooling, but no influence of the position within the built-up area was traced. Thus, the site-specific properties dominated cooling, giving large intra-urban temperature differences. The study also showed the importance of considering a large enough source area to account for micro-scale advection.

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Section: Phase 1 -Site-dependent Coolingmentioning

confidence: 91%

Evening evapotranspirative cooling in relation to vegetation and urban geometry in the city of Ouagadougou, Burkina Faso

Holmer

Thorsson

Lindén

2012

Intl Journal of Climatology

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“…The widespread urban sealing affects the natural climate functions of soils by diminishing the amount of water that infiltrates and by increasing run-off. Even more, sealing obstructs the exchange between soil and atmosphere [111][112][113], so a local air temperature reduction function of soils by evapotranspiration is no longer given. Apart from this urban characteristic, a study regarding the local impact of groundwater table depth on urban air temperature [25] suggests that local topsoil moisture can be regarded as one significant impacting factor for the daytime increase of air temperature.…”

Section: Humidity and Evapotranspirationmentioning

confidence: 99%

“…Several studies focus on air temperatures reducing urban parks and unsealed vegetated areas and their relevance for nearby surroundings [111,112,[114][115][116][117][118][119]. Nevertheless, the climate influencing efficiency of urban soils and vegetation is coupled.…”

Section: Humidity and Evapotranspirationmentioning

confidence: 99%

Is It Possible to Distinguish Global and Regional Climate Change from Urban Land Cover Induced Signals? A Mid-Latitude City Example

et al. 2018

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Abstract:The local climate in cities differs from the one in rural areas, most prominently characterized by increased surface and air temperatures, known as the "(surface) urban heat island". As climate has changed and continues to change in all areas of the world, the question arises whether the effects that are noticeable in urban areas are "homemade", or whether some of them originate from global and regional scale climate changes. Identifying the locally induced changes of urban meteorological parameters is especially relevant for the development of adaptation and mitigation measures. This study aims to distinguish global and regional climate change signals from those induced by urban land cover. Therefore, it provides a compilation of observed and projected climate changes, as well as urban influences on important meteorological parameters. It is concluded that evidence for climate change signals is found predominantly in air temperature. The effect of urban land cover on local climate can be detected for several meteorological parameters, which are air and surface temperature, humidity, and wind. The meteorology of urban areas is a mixture of signals in which the influencing parameters cannot be isolated, but can be assessed qualitatively. Blending interactions between local effects and regional changes are likely to occur.

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“…Greener cities are cooler cities, and several researchers have attempted to quantify the cooling effect of greenery [69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84]. The temperature difference between the parks and their urban surroundings seems to depend on the size of the parks [71,75,[85][86][87][88][89] and on the design of the park [78,90].…”

Section: Greenery Standardsmentioning

confidence: 99%

Regionalist Principles to Reduce the Urban Heat Island Effect

Icaza

Hoeven

2017

Sustainability

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Scientists, climatologists, and urban planners have started to recognize the importance of nature at two very different scales: the global (metabolic) and the local (liveability) scales. The regional scale is the one at which these macro and micro approaches overlap. Future predictions foresee an increase of more than 2450 million urban inhabitants by 2050, thus new balanced urban visions need to be developed in order to guarantee the sustainability of urban areas. The Urban Heat Island (UHI) effect is a climate phenomenon resulting from unbalanced urban design arrangements. This paper analyses several design principles proposed by the 1920s regionalists from the UHI perspective. The preservation of the regional geographical landmarks, the implementation of urban containment policies (limiting city sizes), the increase of greenery and the development of green multifunctional blocks would help reduce the UHI in future urban developments.

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Effect of an urban park on air temperature differences in a central business district area

Cited by 83 publications

References 11 publications

Evening evapotranspirative cooling in relation to vegetation and urban geometry in the city of Ouagadougou, Burkina Faso

Evening evapotranspirative cooling in relation to vegetation and urban geometry in the city of Ouagadougou, Burkina Faso

Is It Possible to Distinguish Global and Regional Climate Change from Urban Land Cover Induced Signals? A Mid-Latitude City Example

Regionalist Principles to Reduce the Urban Heat Island Effect

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