九寨黄龙机场近地面大风浅析

九寨黄龙机场是我国三大高原机场之一,正确认识九寨黄龙机场风的演变规律对于保证飞机的起降安全具有重要意义.本文利用九寨黄龙机场2004～2007年的自动站观测资料,分析了九寨黄龙机场地面风、特别是地面大风的演变特征.此外,还利用WRF模式,模拟了一次大风天气过程.研究结果表明,地面大风的风向和出现时间等均与平均风存在明显的差异.大风主要表现为西北风,均出现在白天.大风出现最多的季节是冬季,而不是平均风速最大的春季.大风的形成与中高纬大气环流的调整密切相关.WRF模式能较好的再现大风的发生时间、强度和风向,这与模式能较好的模拟地表通量和混合层的发展密切相关.

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.