摘要
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。
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.
出处
《地球科学进展》
CAS
CSCD
北大核心
2010年第11期1273-1282,共10页
Advances in Earth Science
基金
公益性行业(气象)科研专项“大尺度水热通量观测系统的研制与应用研究”(编号:GYHY200706046)
国家自然科学基金项目“地表水热通量的时空尺度扩展研究”(编号:40971194)和“基于遥感和数据同化方法的海河流域水文通量预测研究--SP2:不同尺度蒸散量和土壤水分的观测研究”(编号:30911130504)资助
关键词
显热通量
涡动相关仪
大孔径闪烁仪
尺度
Sensible heat flux
Eddy covariance system
Large aperture scintillometer
Scale
