An Improved Method for Correction of Air Temperature Measured Using Different Radiation Shields

• Published in: Advances in atmospheric sciences 2014-11, Vol.31 (6), p.1460-1468
• Main Authors: Cheng, Xinghong, Su, Debin, Li, Deping, Chen, Lu, Xu, Wenjing, Yang, Meilin, Li, Yongcheng, Yue, Zhizhong, Wang, Zijing
• Format: Article
• Language: English
• Subjects: Air temperature; Atmospheric Sciences; Diurnal variations; Earth and Environmental Science; Earth Sciences; Geophysics/Geodesy; Meteorology; Polymers; Solar radiation; Temperature; Temperature measurement; Ultraviolet radiation; Wind speed; 太阳天顶角; 太阳辐射; 校正方法; 温度测量误差; 温度误差; 空气温度; 纤维增强复合材料; 辐射屏蔽
• ISSN: 0256-1530; 1861-9533
• DOI: 10.1007/s00376-014-3129-0

The variation of air temperature measurement errors using two different radiation shields （DTR502B Vaisala,Finland,and HYTFZ01,Huayun Tongda Satcom,China） was studied.Datasets were collected in the field at the Daxing weather station in Beijing from June 2011 to May 2012.Most air temperature values obtained with these two commonly used radiation shields were lower than the reference records obtained with the new Fiber Reinforced Polymers （FRP） Stevenson screen.In most cases,the air temperature errors when using the two devices were smaller on overcast and rainy days than on sunny days; and smaller when using the imported rather than the Chinese shield.The measured errors changed sharply at sunrise and sunset,and reached maxima at noon.Their diurnal variation characteristics were,naturally,related to changes in solar radiation.The relationships between the record errors,global radiation,and wind speed were nonlinear.An improved correction method was proposed based on the approach described by Nakamura and Mahrt （2005） （NM05）,in which the impact of the solar zenith angle （SZA） on the temperature error is considered and extreme errors due to changes in SZA can be corrected effectively.Measurement errors were reduced significantly after correction by either method for both shields.The error reduction rate using the improved correction method for the Chinese and imported shields were 3.3％ and 40.4％ higher than those using the NM05 method,respectively.