超声风温仪测温的误差订正

利用同步进行的风速、温度、湿度湍流观测资料，对超声风温仪温度测量结果作了水平风速和湿度的订正。结果表明:由于超声风温仪测温受空气湿度和水平风速的影响，对其作相应的订正是十分必要的。|z/L|＜1时，湿度和风速对超声风温仪温度方差和感热通量测量值所引起的误差是不可忽视的。而在|z/L|＞1区间，仅计入湿度影响，已够精确。对于温度谱密度，当nSθ(n)/σ2θ低于0.01时，有一高频的噪声频率阈值，高于此频率，nSθ(n)/σ2θ与无因次频率f呈+1次幂关系。

Correction of Temperature Measurement with Sonic Anemometer-Thermometer

Turbulence variance and flux of temperature fluctuation derived by simulatneous measurements with sonic anemometer-thermometer and fine wire thermometer have been compared for re-evaluating the contamination of humidity and horizontal wind in sonic temperature Good agreement between two measurements is obtained if proper correction is applied to the statistics of sonic temperature In the near neutral stratification the correction for both humidity and horizontal velocity must be considered when using sonic temperature, but in other stability ranges it is precise enough to correct the data with humidity only Our results show the sonic temperature spectrum levels increase at high frequency end as in the previous study However, the increase is less significant in fine wire temperature spectrum This is cause by noise aliasing and it becomes severe due to lower temperature resolution in the sonic measurement