Numerical study on effect of urban heating on local climate during calm inter-monsoon period in greater Kuala Lumpur, Malaysia

Ooi, Maggie Chel Gee; Chan, Andy; Ashfold, Matthew J.; Morris, Kenobi Isima; Oozeer, Muhammad Yaasiin; Salleh, Siti Aekbal

doi:10.1016/j.uclim.2017.04.010

Cited by 13 publications

(7 citation statements)

References 70 publications

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“…Single‐layer urban canopy model (UCM) package with detailed specification urban morphology is coupled with Noah Land Surface Model to bridge the gap between microscale urban land surface environment and near‐surface layer atmospheric conditions (Chen et al, ). It is shown that the locally calibrated urban parameters, including impervious portion of urban grid, canopy geometry, and thermal properties, have substantially improved the prediction of the near‐surface temperature and wind field (Morris et al, ; Ooi et al, ). The atmospheric heating fueled by longwave and shortwave radiation budget is resolved through the Rapid Radiative Transfer Model (Mlawer et al, ).…”

Section: Model Settingsmentioning

confidence: 99%

Interaction of Urban Heating and Local Winds During the Calm Intermonsoon Seasons in the Tropics

Ooi

Chan

Subramaniam³

et al. 2017

JGR Atmospheres

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Rapid urbanization of cities has greatly modified the thermal and dynamic profile in the urban boundary layer. This paper attempts to study the interaction of urban heating and the local topographic‐induced flow circulation for a tropical coastal city, Greater Kuala Lumpur, in Malaysia. The role of sea‐and‐valley‐breeze‐orientated synoptic flow (SBOS) on the interaction is determined by comparing two intermonsoon periods. A state‐of‐the‐art numerical model, Advanced Research Weather Research and Forecasting model, is used to identify the influence of urbanization through modification of urban surfaces. The model reasonably reproduces the vertical sounding data and near‐surface weather parameters. The diurnal urban heating pattern is attributed to three predominant factors: (i) weak under calm and clear‐sky condition (morning heating), (ii) weak under larger atmospheric moisture content (late afternoon convection), and (iii) largest (1.4°C) due to differential cooling rate of urban and rural surface at night. The interaction of urban thermals and upper level SBOS affects the effect of urbanization on local circulation during the day. The urban thermals reduce the weak opposing SBOS (<2 m s−1) and enhance the inflow of moisture‐rich sea breeze passage. This increases the intensity of downwind convective precipitation during late afternoon. On contrary, the strong opposing SBOS (>2 m s−1) suppresses the vertical lifting of urban thermals and decelerates the sea breeze front. It is discovered that the interaction of urban heating and topographic‐induced flow is interdependent while the synoptic flow plays a critical role in modifying both factors, respectively.

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Section: Model Settingsmentioning

confidence: 99%

Interaction of Urban Heating and Local Winds During the Calm Intermonsoon Seasons in the Tropics

Ooi

Chan

Subramaniam³

et al. 2017

JGR Atmospheres

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“…Sani 1972Sani , 1984Azid et al 2015;Elsayed 2006Elsayed , 2012aAhmad et al 2010), as well as numerical modelling (e.g. Morris et al 2017a, b;Ooi et al 2017a) to evaluate the urban heat island around Kuala Lumpur. These studies reached a general consensus: (1) the urban heat island intensity (UHII) is continually increasing, with estimates within the last decade varying between 4.2 °C (Morris et al 2017a) and 9.5 °C (Ahmad et al 2010); (2) the UHII is higher on the weekdays, highlighting the contribution of traffic-induced heating (Elsayed 2012a, b, c); (3) urban cool islands (for instance, in the vicinity of Lake Garden Park, or within older and leafier districts such as Kampung Baru;Sani 1972Sani , 1984 are reducing in size and in some cases disappearing altogether, primarily due to heavy traffic in and surrounding these areas (Elsayed 2012a, b;cf.…”

Section: Introductionmentioning

confidence: 99%

Urban heat island modelling of a tropical city: case of Kuala Lumpur

Wang¹,

Aktaş²,

Stocker

et al. 2019

Geosci. Lett.

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The steep increase in urban populations results in the spatial extent of cities expanding both horizontally and vertically. The climatic response of urban areas differs greatly to rural areas exposed to the same environmental conditions, with urban temperatures generally being higher, particularly in the late afternoon and evening. Coupled with the upward trend in global temperatures, urban heating can be classified as an atmospheric hazard that affects a high proportion of the population in some countries, which needs to be addressed through local and national government planning strategies. This study presents preliminary findings from a city scale urban climate model developed using the fast climate modelling tool ADMS-Urban for the city of Kuala Lumpur, Malaysia, which is known to suffer from substantial urban heating, and discusses the extent and intensity of the urban heat island in light of existing literature based on field measurements. The model has been configured to use surface characteristic data derived from land-use data as input, and through comparison with temperature variations derived from satellite imagery, the model is seen to clearly capture the spatial variation of temperature over the domain. The urban heat island intensities predicted by the model are comparable to the values reported in literature. This study also demonstrates the strong relationship between temperatures and wind speed, which is generally much lower in tropical Kuala Lumpur compared to mid-latitudes, and the urban heat island intensity and nocturnal cooling. The future modelling studies should account for anthropogenic heating, for instance, from air conditioning units and traffic, which are important sources of heat in tropical areas, and expand more on building materials and morphology for a thorough appraisal of urban heating in Kuala Lumpur.

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“…From UHI models, it was found that regional temperature could rise by up to 2.26 • C in a two decade time frame in Central Asia [20]. Several studies have also been actively conducted to evaluate the UHI in Malaysia, by means of numerical investigation [21][22][23], satellite imagery and remote sensing [24][25][26], surface energy balance modelling [27,28], weather station monitoring [29][30][31][32][33], etc. Although there is no significant borderline for urban and rural areas in Singapore, a maximum of a 4.01 • C temperature difference was found [34].…”

Section: Uhi In Tropical Climatementioning

confidence: 99%

Thermal Behavior and Energy Efficiency of Modified Concretes in the Tropical Climate: A Systemic Review

et al. 2021

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Concrete remains the most utilised construction material for building envelopes, which regulate the indoor temperature to achieve human thermal comfort. Often, the energy consumption for building performance appraisal is related to the thermal behaviour of building materials as heating, ventilation, and air conditioning systems all variously contribute to human comfort. Following the development of concrete technology, many types of concrete have been invented to serve several purposes in the construction industry. To clearly understand the concrete type tailored for the specifics of a construction project, the local climate, concrete mechanical properties, and concrete thermal behaviours should be primarily identified to achieve energy efficiency, which also suits the sustainability of global materials. This paper, therefore, reviews the modified concrete thermal behaviours in the tropical climate for more systematic city planning in order to achieve better energy efficiency. Urban heat islands in the tropics and contributing factors, as well as heat transfer mechanisms, are first highlighted. The requirements of concrete thermal behaviour for building envelopes are then discussed through specific heat capacity, thermal conductivity, thermal diffusivity, time lag, and decrement factor in the context of applications and energy consumption in the tropical regions. With a case study, it is found that concrete thermal behaviours directly affect the energy consumption attributed mainly to the use of cooling systems in the tropics. The study can be a reference to mitigating the urban heat island phenomenon in the planning of urban development.

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Numerical study on effect of urban heating on local climate during calm inter-monsoon period in greater Kuala Lumpur, Malaysia

Cited by 13 publications

References 70 publications

Interaction of Urban Heating and Local Winds During the Calm Intermonsoon Seasons in the Tropics

Interaction of Urban Heating and Local Winds During the Calm Intermonsoon Seasons in the Tropics

Urban heat island modelling of a tropical city: case of Kuala Lumpur

Thermal Behavior and Energy Efficiency of Modified Concretes in the Tropical Climate: A Systemic Review

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