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

Ooi, Maggie Chel Gee; Chan, Andy; Subramaniam, K.; Morris, Kenobi Isima; Oozeer, Muhammad Yaasiin

doi:10.1002/2017jd026690

Cited by 20 publications

(22 citation statements)

References 94 publications

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“…By 17:00 LT (not shown) the boundary layer height is highly variable and the 304 K air mass is well aloft at 1,100 to 1,200 m. The surface air temperature has cooled to ~300 K. The heat island circulations are starting to mature during this time (Figure c), and the sea breeze is prevented from moving further inland after it reaches the catchment area due to the interaction of the heat island circulation and the sea breeze. The patterns of sea breeze for the Control case are found similar to that reported by Ooi et al () in Malaysia.…”

Section: Resultssupporting

confidence: 87%

High‐Resolution, Multilayer Modeling of Singapore's Urban Climate Incorporating Local Climate Zones

Mughal

Yin

et al. 2019

JGR Atmospheres

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We applied Weather Research and Forecasting (WRF) model's Multilayer Urban Canopy Model (MLUCM) to simulate the urban climate of Singapore during a hot period in April 2016. The high‐resolution local climate zone (LCZ) map was used as urban land use/land cover data in order to study the intraurban variability in different LCZ classes. The LCZ map for Singapore was developed by adopting the World Urban Database and Access Portal Tools (WUDAPT) methodology based on satellite remote sensing imageries and building height data. The coupled WRF/MLUCM model was validated using meteorological data from stations across Singapore. Higher index of agreement compared to observations and lower root‐mean‐squared error of 2‐m temperature, relative humidity, and global horizontal irradiance showed satisfactory model performance. A sensitivity analysis of initial and boundary conditions helped in determining the model configuration with the least error for quantifying the urban heat island (UHI) effect. The diurnal cycle and the spatial pattern of UHI were investigated, and it was found that the mean UHI intensity peaked in the early morning at 2.2 °C, reaching 3.6 °C in the Compact High Rise (LCZ1) areas. The anthropogenic heat due to indoor air conditioning was found to play a major role in all the processes studied, while the effect of the different land use types was most pronounced during nighttime and least visible near noon. The UHI circulation developed near the central catchment is found to prevent sea breezes from further propagating inland.

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Section: Resultssupporting

confidence: 87%

High‐Resolution, Multilayer Modeling of Singapore's Urban Climate Incorporating Local Climate Zones

Mughal

Yin

et al. 2019

JGR Atmospheres

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“…Monsoon season (boreal summer monsoon between May and September; see Ooi et al 2017b), followed a precipitation incident the previous evening. This particular day was chosen for analysis because of the availability of satellite imagery with minimum cloud cover.…”

Section: City Scale Urban Climate Modelling Of Greater Kuala Lumpur Bmentioning

confidence: 99%

“…Kuala Lumpur (3°09ʹ35ʺN 101°42ʹ 00ʺE) is located in the tropics, and has two distinct monsoon seasons, i.e. the relatively drier Southwest Monsoon from May to September, and the rainy Northeast Monsoon from November to March (Ooi et al 2017b). On course to be a world class city, Kuala Lumpur will continue its development in the next decade.…”

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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“…Most of these studies found that urbanization strengthened the sea breezes, significantly increasing precipitation. Numerical studies for coastal cities adjacent to mountains have been also done, for instance, for the cities of Taipei, Taiwan (e.g., Lin et al, 2008Lin et al, , 2011, Taichung, Taiwan (e.g., Lin et al, 2008), Guangzhou, China (e.g., Wang et al, 2014), Kuala Lumpur, Malaysia (e.g., Argüeso et al, 2016;Ooi et al, 2017), São Paulo, Brazil (e.g., Vemado and Pereira Filho, 2016) and Tokyo, Japan (Matheson and Ashie, 2008;Shimoju et al, 2010;Inamura et al, 2011;Souma et al, 2013;Kusaka et al, 2014;Seino et al, 2016Seino et al, , 2018Bélair et al, 2018). Lin et al (2008) showed that the interaction of the UHI effect with sea breezes and mountain uplift increase rainfall in the mountainous areas on the leeward sides of Taipei and Taichung.…”

Section: Introductionmentioning

confidence: 99%

Urban impacts on the spatiotemporal pattern of short‐duration convective precipitation in a coastal city adjacent to a mountain range

Kusaka

Nishi

Mizunari

et al. 2019

Quart J Royal Meteoro Soc

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The present study examines urban impacts on short‐duration precipitation in an idealized coastal city adjacent to a mountain range using two‐dimensional idealized simulations performed with a modified version of the Weather Research and Forecasting (WRF) model. A unique aspect of this study is that an ensemble simulation approach with 243 members is used with sensitivity experiments to reduce uncertainty arising from nonlinearity in the precipitation simulation and to evaluate the statistical significance. Results of the experiments reveal that urbanization increases the precipitation leeward of the urban area and decreases it in the area further inland. These anomalies are statistically significant at the 99% level. Additional sensitivity experiments show that the urban influence on precipitation is slightly sensitive to the mountain height, urban scale and soil moisture, but not to the roughness length. Our analyses indicate that these precipitation changes arise because urbanization slows the sea‐breeze front, shifting the moisture convergence zone further inland. Additional analyses are done using the water‐budget equation and a linear theory on the diurnal variations of the planetary boundary layer. Results show that changes in the sea breezes and moisture transport arise from a decrease in surface pressure over the urban area associated with an increase in the surface sensible heat flux.

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

Cited by 20 publications

References 94 publications

High‐Resolution, Multilayer Modeling of Singapore's Urban Climate Incorporating Local Climate Zones

High‐Resolution, Multilayer Modeling of Singapore's Urban Climate Incorporating Local Climate Zones

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

Urban impacts on the spatiotemporal pattern of short‐duration convective precipitation in a coastal city adjacent to a mountain range

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