Effect of a heat island on the meteorology of a complex urban airshed

A three-dimensional mesoscale model was used to study the effect of an urba n heat island in a relatively complex situation. A heat emission inventory was carried out for an urban airshed that includes sources such as motor ve hicles, waste heat from industries and electricity consumption. To demonstr ate the relative significance of anthropogenic heat flux and variant surfac e characteristics, three model simulations were conducted. In the first sim ulation, anthropogenic heat flux was ignored and non-variant surface proper ties were considered for the entire modelling domain. In the second simulat ion, variant surface characteristics were considered. While in the third si mulation, gridded anthropogenic heat flux and variant surface characteristi c were utilised. From these experiments, it was inferred that an additional source of heat in urban areas can substantially affect the wind and temper ature regime under light wind conditions. During the day, the anthropogenic heat flux has minimum effect on the urban temperature, however it magnifie s the intensity of the convergence near the urban areas.