Characteristics of Surface Gale in Jiuzhai Huanglong Airport

Jiuzhai Huanglong Airport is one of the three airports in the Tibetan Plateau.Prediction of surface gale is very important for the taking off and landing of airplane.The surface winds,especially surface gale,were investigated by using the data obtained by the automatic weather station from 2004 to 2007,as well as the WRF model.The results show that there are significant differences between mean surface wind and surface gale.Surface gale is occurred during daytime and its direction is northwest.The favorable season for surface gale is winter rather than spring in which the maximum speed of all scale wind is occurred.The formation of surface gale is closely related with the transition of general circulation in middle and high latitude.The WRF model can well capture beginning and end time,magnitude and direction of surface gale.These can be attributed to the model's good performance on the simulation of surface flux and planetary boundary layer process.