Scintillometry is a non-invasive measurement technique for acquiring spatially-averaged surface heat and moisture fluxes in areas where setting up arrays of instruments can be expensive and logistically difficult. As a path-averaged measurement, scintillometry is a valuable tool for measuring integrated atmospheric turbulence over agricultural terrain where in situ measurements would interfere with farm operations. For this study, a two-wavelength scintillometry system was deployed at an effective height of 7.3 m above ground spanning 749 m over an active vineyard with a canopy height of \(\approx \) 2.15 m. Four eddy-covariance stations were placed strategically throughout the vineyard to capture any spatial heterogeneity. The stations were used to assess whether the spatially-averaged structure parameters of temperature, \(\langle C_{T^2} \rangle \), and humidity, \(\langle C_{q^2} \rangle \), adhered to Monin–Obukhov similarity theory (MOST). We derive a new metric, \({\mathscr {D}}\), to quantify the deviation from homogeneity that describes the nonlinear effects in MOST linking structure parameters and fluxes. This deviation metric gives a physical meaning to the apparent flux overestimation of scintillometry discussed in previous literature. It also facilitates the identification of periods when nonlinear effects are minimal. Using \({\mathscr {D}}\), we show that the vineyard is homogeneous at the spatial scales of the scintillometer path and use another dataset to emphasize the applicability of \({\mathscr {D}}\) to quantify heterogeneity for a variety of composite surfaces.

闪烁测量法是一种非侵入性测量技术，用于在设置仪器阵列成本高且后勤困难的区域中获取空间平均的表面热量和水分通量。作为一种路径平均测量，闪烁法是一种有价值的工具，用于测量农业地形上的综合大气湍流，在这种情况下，现场测量会干扰农场作业。在这项研究中，一个双波长闪烁测量系统部署在距地面 7.3 m 的有效高度，跨越 749 m，覆盖一个树冠高度为\(\约 \)的活跃葡萄园。 2.15 米。四个涡度协方差站被战略性地放置在整个葡萄园中，以捕捉任何空间异质性。这些台站用于评估温度\(\langle C_{T^2} \rangle \)和湿度\(\langle C_{q^2} \rangle \)的空间平均结构参数是否符合莫宁-奥布霍夫相似性理论（MOST）。我们推导出一个新的度量标准\({\mathscr {D}}\)来量化描述 MOST 链接结构参数和通量中的非线性效应的同质性偏差。这个偏差度量对先前文献中讨论的闪烁法的表观通量高估给出了物理意义。它还有助于识别非线性效应最小的时期。使用\({\mathscr {D}}\)，我们表明葡萄园在闪烁仪路径的空间尺度上是同质的，并使用另一个数据集来强调\({\mathscr {D}}\)量化的适用性各种复合表面的异质性。