空气动力学阻抗的测量研究

资助项目:

长江学者和创新团队发展计划 IRT0409

国家自然科学基金项目 40671128

全球环境基金项目 TF053183

Measurements of the Aerodynamic Resistance

1.
State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, Beijing 100875
2.
Beijing Water Technology Center, Beijing 100073

摘要: 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。
- 空气动力学阻抗;
- 蒸发皿;
- 涡旋相关方法
Abstract: 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.
- the aerodynamic resistance;
- evaporation pan;
- eddy correlation method

图 1 2004年6月6日 (a)、8日 (b) 裸土以及15日 (c)、26日 (d) 玉米田由蒸发皿和涡动相关仪测定的空气动力学阻抗日变化

Fig. 1 Diurnal variation of the aerodynamic resistances measured by the evaporation pan and eddy correlation system (a) bare soil surface, June 6, 2004, (b) bare soil surface, June 8, 2004, (c) maize field, June 15, 2004, (d) maize field, June 26, 2004

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图 2 蒸发皿和涡旋相关仪测得的空气动力学阻抗的对比

Fig. 2 Comparison between the aerodynamic resistances derived from measurements by the evaporation pan (r_av) and by the eddy correlation system (r_ah)

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图 3 利用蒸发皿计算的显热通量 (H_{r_av}) 与涡旋相关仪测量值 (H_obs) 的对比

Fig. 3 Comparison between the sensible heat flux calculated by the evaporation pan (H_{r_av}) and measured from the eddy correlation system (H_obs)

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表 1 相关变量的测量

Table 1 Measurements together with instruments relevant

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