稳态与湍流特征测试对通量数据质量的评价

Using Quality Assessment Method to Test the Data of Eddy Covariance

应用CO_2通量、感热和潜热通量稳态测试及垂直速度积分测试相结合的湍流数据质量评价方法对锡林浩特国家气候观象台2009年全年的湍流通量观测数据进行了质量评价。结果表明,锡林浩特通量观测数据质量总体较好;80%以上数据通过质量评价为较好数据;质量评价较好的数据分布呈白天大于夜间、夏季大于冬季的特点。经过对比分析,前期数据处理能剔除大部分质量不好的数据,但应用稳态测试与湍流积分测试筛选后,数据质量仍有明显提高,能量闭合率较前期数据分析前提高2%以上。

The quality assessment （QA） method which includes the steady state test of the CO2 flux, sensi- ble/latent heat flux and integral turbulence characteristic test of the vertical velocity was used to analyze the turbulence flux data observed by eddy covariance at Xilinhot, 2009. The main results are as follows. The data are good on the whole and there are 80%data well assessed by the QA method. The good data size in daytime is more than in nighttime and in summer is more than in winter. From the comparative analysis, the pre-processing work can eliminate most bad＇data. Furthermore, the quality of the data as- sessed by the QA method will be obviously improved. Using these good data to analyze the energy bal- ance, the closure of the local energy balance has increased by more than 2 %.