纳木错(湖)地区湍流数据质量控制和湍流通量变化特征

利用中国科学院纳木错多圈层综合观测研究站2009年全年的大气湍流观测资料,应用Foot-print模型分析了青藏高原非均匀下垫面湍流观测数据的数据质量、质量评价及不同下垫面对湍流通量的贡献。结果表明:纳木错(湖)地区因不同土地利用类型的差别,导致地表通量分布不均匀,草地对地表通量的贡献最大;对不同大气层结状态,观测站周围200m范围内的地表通量贡献各不相同,上风向通量贡献源区较大,湍流发展较充分。在不稳定状态和中性状态下,纳木错地区地表通量数据质量较高,即白天观测的通量数据质量较高;在稳定状态下数据质量较低,即夜间的通量数据质量较差;纳木错地区的湍流通量受湖陆风和大气稳定性影响较大。

Analyses on Turbulence Data Control and Distribution of Surface Energy Flux in Namco Area of Tibetan Plateau

Using turbulent data during observational period in 2009 at Namco Monitoring and Research Station for Multisphere Interactions,Chinese Academy of Sciences(NAMORS/CAS) and footprint model,the quantity of turbulence data and the contribution of the inhomogeneous underling surface for the turbulence flux was analyzed.The obtained results show that the distribution of the turbulence flux was uniform due to the different land uses.The contribution of grass for the turbulence flux was largest in whole year.For the varying atmospheric stability stratification,the contribution of the turbulence flux was different around 200 m surrounding the station.Upwind of the tower were high flux contribution and high quality of the turbulence flux.Under the unstable and neutral stratification condition,the data quality was higher than it under stable surface layer at night.The low quality of the turbulence flux was under the stable stratification.The quantity of the turbulence flux was influenced by land-lake wind and atmospheric stability stratification on this area.