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.