大孔径闪烁仪法测算低丘山地人工混交林显热通量的可行性分析

The Feasibility of Using LAS Measurements of the Sensible Heat Flux from a Mixed Plantation in the Hilly Zone of the North China

利用位于河南省济源市的华北低丘山地30年生栓皮栎—侧柏—刺槐人工混交林2009年主要生长季节(5～9月)湍流通量及空气结构参数等观测数据,确定迭代法为该下垫面条件下大孔径闪烁仪(LAS)测算显热通量的计算法,测算白天大气非稳定层结状况下的显热通量(HLAS)。并采用通量印痕模型,对LAS法通量源区内由2台涡度相关系统观测得到的显热通量进行订正,得到源区内总显热通量值(HfEC)。分析LAS法与涡度相关法的显热通量测算或测定值的相关性,结果表明:HLAS与HfEC的线性相关系数可达0.93。说明在分析通量印痕和通量源区的基础上,采用LAS法测算低丘山地人工混交林显热通量具有较好的可行性。

In this study,by use of the Large Aperture Scintillometer（LAS） method and the Eddy Covariance（EC） method respectively,the sensible heat flux under unstable stratification conditions was calculated over a mixed plantation in the hilly zone of the north China from May to September in 2009,which was called HLAS and HEC for short respectively.HEC in the source area for LAS method（HfEC） was corrected and estimated with the application of footprint model.The result showed that the correlation coefficient between HfEC and HLAS was 0.93.It proved the feasibility of using LAS measurements to estimate H over the mixed plantations in the hilly zone,based on the analysis of the footprint and source area.