大孔径闪烁仪和涡动相关仪观测显热通量之间的尺度关系

利用北京昌平小汤山2002年、2004年涡动相关仪和大孔径闪烁仪的观测数据,借助解析足迹模型计算的源区,分析均匀、非均匀下垫面上涡动相关仪和大孔径闪烁仪观测显热通量之间的差异和关系.结果表明:地表的均匀与非均匀性质,直接影响涡动相关仪和大孔径闪烁仪观测的显热通量的差异大小.在分析均匀、非均匀地表上2种仪器源区重叠面积及重叠区域内足迹值大小与观测通量值之间的关系后,构建一个非均匀地表上2台涡动相关仪与1台闪烁仪观测通量之间的尺度关系式.

The Scale Relationship of Sensible Heat Flux Measured by Large Aperture Scintillometer and Eddy Covariance System

With the flux data observed by Eddy Covariance system (EC) and Large Aperture Scintillometer (LAS) at Xiaotangshan (Changping district, Beijing) in 2002 and 2004, and based on an analytical footprint model, the scale relationship of sensible heat flux between EC and LAS measurement was analyzed. The results showed that the level of surface homogeneity or heterogeneity had a direct influence on the sensible heat flux difference measured by eddy covariance system and large aperture scintillometer. After analyzing the relationship between flux differences of EC and LAS observation and the footprint ratio and size ratio of overlap zone of source areas of the two sensors over homogeneous and heterogeneous surfaces, a scale transfer equation was constructed to composite the sensible heat flux measured by eddy covariance system at each patch into the area-averaged sensible heat flux.