空气动力学阻抗的测量研究

利用涡旋相关方法和蒸发皿方法分别测量了裸地和玉米田的空气动力学阻抗, 分析了空气动力学阻抗的日变化特征, 同时对两种测量方法进行了比较。结果表明:实测空气动力学阻抗的日变化比较明显, 但变化幅度不大 (0~200 s/m)。两种方法得到的空气动力学阻抗具有可比性, 但蒸发皿方法测量的空气动力学阻抗普遍小于涡旋相关方法的测量值。

Measurements of the Aerodynamic Resistance

Measurements both from eddy correlation system and evaporation pan are used to derive aerodynamic resistance over bare soil surface as well as maize field. Diurnal variations of aerodynamic resistance are also analyzed. A comparison is made between the aerodynamic resistances derived from the two observation methods. Results show that the diurnal variation of aerodynamic resistance during daytime is obvious for both bare soil surface and maize field although the variation range is limited (0—200 s/m). Aerodynamic resistance derived from measurements by evaporation pan is normally smaller than that by eddy correlation system.