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大孔径闪烁仪可以获取公里级尺度的显热/潜热通量,其观测数据在农林业、水文、气象等领域的研究中具有越来越重要的作用。以海河流域2008年密云站和馆陶站大孔径闪烁仪的观测数据为例,讨论了数据筛选与处理方法,以及大气不稳定状态下不同处理方法对显热通量造成的影响。结果表明:空气折射指数结构参数应结合电压信号的方差进行计算、采用逐日的日平均波文比系数进行湿度订正、结合空间权重函数计算有效高度、选取Andreas(1988)稳定度函数计算显热通量等是可信的。通过对不同插补方法的比较可知,采用非线性回归方法和以零值替代的方法对不稳定状态和稳定状态下30 min缺失的显热通量进行插补,采用动态线性回归方法对日显热通量的缺失进行插补是可行的。为了解决由于冬天净辐射和显热通量较小,造成能量平衡方程余项法计算的蒸散量产生较大误差的问题,可采用根据大孔径闪烁仪与涡动相关仪观测的日蒸散量建立的关系式进行估算。基于上述方法的研究,形成了一套较为完整的大孔径闪烁仪观测数据的处理流程,保证了在不同下垫面、不同的天气状况条件下都能获取质量可靠、数据连续的大孔径闪烁仪观测的显热/潜热通量。
The large aperture scintillometer can obtain the sensible heat / latent heat flux on the kilometer scale, and the observed data have an increasingly important role in the research of agriculture, forestry, hydrology and meteorology. Taking the observation data of the large aperture scintillator at Miyun and Guantao stations in the Haihe River Basin in 2008 as an example, the data screening and treatment methods and the effects of different treatment methods on the sensible heat flux under atmospheric instability are discussed. The results show that the structure parameters of air refraction index should be calculated according to the variance of voltage signal. The day-by-day averageavertheave ratio is used for humidity correction. The effective height is calculated by space weight function. The sensible heat function is calculated by Andreas (1988) The amount is credible. By comparison of different interpolation methods, we can see that the sensible heat fluxes in the unstable state and the stationary state at 30 min are interpolated by using the non-linear regression method and the zero-value alternative method. The dynamic linear regression method is used to analyze the daily significant The lack of heat flux interpolation is feasible. In order to solve the problem of large error in the evapotranspiration calculated by the remainder method of the energy balance equation due to the small net radiation and sensible heat flux in winter, the daily evapotranspiration measured by the large aperture scintillator and the eddy coherence meter can be used The relationship between the estimates. Based on the above research, a complete set of large-aperture scintigraphy observation data processing process has been formed to ensure the reliable and continuous data of large-aperture scintigraphy under different underlying conditions and different weather conditions The observed sensible heat / latent heat flux.