Urban Heat Island associated with Land Use/Land Cover and climate variations in Melbourne, Australia

Urbanization is known as one of the most prominent global problems that alter the atmosphere and land surface properties. The intensity of Urban Heat Island (UHI) associated with surface temperature and component attributes were assessed using the Community Land Model (CLM). The variations of UHI with Land Use/Land Cover (LULC) and climate variations were also investigated to provide a link among urbanization, surface energy balance interactions, and extreme hydroclimatic events which are drought ('big dry' and 'angry summer') and heavy rainfall ('big wet') in Melbourne, Australia. Generally, UHI demonstrated a uniform increasing trend with an similar to 1.20 +/- 0.20 degrees C increment, along with urbanization expansion of +14.93 % from 2001 to 2014. Furthermore, urban area showed positive contribution to UHI based on Land Contribution Index (LCI). High surface temperatures also resulted in higher sensible heat flux (Qh) and lower latent heat flux (Qle). During the multiple extreme climate events, the UHI biophysical drivers were majorly related to the convection reduction during 'big dry' (2001-2009), surface evaporative cooling during 'big wet' (2010-2011), and heat storage release during 'angry summer' (2012-2013). Overall, this analysis demonstrated correlation of UHI intensity and its component attributes with urban expansion, which was associated with LULC and climate variations in Melbourne.