Numerical simulation of local thermal effects on the wind field of the Canterbury Plains, New Zealand

Abstract The results of a mesoscale wind field modelling study are presented. A three dimensional model is used to simulate thermal effects on airflow over the Canterbury Plains. The main emphasis is on examining the sea breeze effect and its interaction with the broader scale gradient airflow and the topographic effect of Banks Peninsula. The model is used to investigate both diurnal and seasonal variations in the sea breeze effect Simulations suggest that localised sea breezes develop to the north and south of Banks Peninsula under weak gradient wind conditions. These results are supported by empirical evidence. However, under stronger prevailing winds, the sea breeze effect may be to merely enhance or modify that airflow. Results suggest that rapid changes in land‐sea temperature difference are likely to influence the magnitude of any sea breeze effect in this region. It is concluded that the application of such models at the mesoscale is becoming important in extending our knowledge of local airflow systems and the way they respond to the varying character of land and sea surfaces.