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Empirical study on temporal variations of canopy-level Urban Heat Island effect in the tropical city of Greater Kuala Lumpur

Logaraj Ramakreshnan,N. Aghamohammadi,Chng Saun Fong,Amirhosein Ghaffarianhoseini,L. Wong,Nik Meriam Nik Sulaiman

Published 2019 in Sustainable cities and society

ABSTRACT

Abstract A very few studies have evaluated and understood the temporal dynamics of UHI in many expanding tropical cities. Hence, this study investigated the temporal variations of canopy-level UHI in selected urban stations, namely Petaling Jaya (PJ) and Subang (SUB), of Greater Kuala Lumpur (GKL) using 2016’s hourly data set obtained from meteorological observatories. The association between meteorological factors and UHI Intensity (UHII) is evaluated using linear regression models and Pearson correlation analysis. The findings revealed positive thermal contrasts between urban and sub-urban stations with maximum UHII during dry, southwest monsoon season in PJ (June: 1.68 °C) and SUB (August: 1.29 °C) stations respectively. PJ station exhibited a distinct diurnal cycle with the maximum nocturnal UHII of 1.71 °C at about 8 p.m. after sunset under ideal meteorological conditions. The results also demonstrated that UHI events occurred more frequently at nights in urban stations in the magnitude range of 0–2 °C. Cooling at all urban sites starts around 2–3 p.m. with the highest rate of 0.73 °C/h and 0.96 °C/h in PJ and SUB stations. Meanwhile, relative humidity displayed a low positive correlation (r = 0.37, p ≥ 0.05) and a high negative correlation (r = −0.79, p

PUBLICATION RECORD

  • Publication year

    2019

  • Venue

    Sustainable cities and society

  • Publication date

    Unknown publication date

  • Fields of study

    Geography, Environmental Science

  • Identifiers
    DOI 10.1016/J.SCS.2018.10.039
  • External record

    Open on Semantic Scholar

  • Source metadata

    Semantic Scholar

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