Numerical Study of Diurnal Circulations ofTropical Coastal Site Visakhapatnam Using theARW MesoScale Model

Land and Sea breezes are the most commonly observed meso scale local systems on coastal zones. They have been significant role on transport and diffusion of air pollutants in coastal areas. In the present study we have simulated the sea breeze circulation for the coastal city of Visakhapatnam (17.42'N,83.15').The mesoscale model WRF ARW is used for this study. Modeling period is selected for typical summer (18 may 2011). The WRF model used with 2 nested domains with 9km and 3 km horizontal resolution. The initial and boundary conditions were taken from NOAA NOMADS GFS data with horizontal resolution of 1 degree by 1 degree. The model could predict the essential features like onset, strength and decay of sea breeze. The model outputs of temperature, potential temperature, Relative humidity, Wind speed are compared with the radiosonde observations of the Viskhapatnam.The horizontal and vertical extent of Sea / Land Breezes also simulated well.