国产光学型大孔径闪烁仪的技术性能分析

Assessing the Performance of Domestic Optical Large Aperture Scintillometer under Different Environment Conditions

利用2009—2012年在北京密云、青海阿柔、河南济源、甘肃张掖、河北馆陶和沽源的野外对比试验数据,分析了国产光学型大孔径闪烁仪的观测精度、稳定性和一致性,为国产光学型大孔径闪烁仪的后续生产和改进提供科学依据。分析结果表明:(1)以德国BLS900闪烁仪观测值作为参考值,张掖巴吉滩3套和沽源站5套国产大孔径闪烁仪样机感热通量观测值的平均均方根误差分别为19.91 W·m^(-2)和9.81 W·m^(-2);样机感热通量观测值均值与涡动相关仪观测值比较,均方根误差分别为21.08 W·m^(-2)和12.87 W·m^(-2),表明国产大孔径闪烁仪具有较好的观测精度;(2)国产大孔径闪烁仪在高温、低温、高湿或低湿的恶劣天气条件下以及长时间序列的观测均具有较好的稳定性;(3)样机观测感热通量之间的回归斜率差异较大,为6%,相关系数大于0.98,表明国产大孔径闪烁仪的一致性较好。综上所述,国产光学型大孔径闪烁仪基本达到了国外同类仪器的性能水平。

The accuracy, stability and consistency of domestic optical large aperture scintillometers （YZLAS） were assessed using the observation experiments located in Miyun, A＇rou, Jiyuan, Zhangye, Guantao and Guyuan in China during 2009 to 2012. The results can provide a potential scientific basis to improve and produce the subsequent domestic optical large aperture scintillometer. The results showed that： （ 1 ） Taken BLS900 scintillometer as the reference, the domestic large aperture scintillometer derived very similar sensible heat fluxes with the reference, with the averaged RMSE of 19.91 W ~ m-2 and 9. 81 W · m-2, respectively at Zhangye Baji site （three YZLAS sets）and Guyuan site （five YZLAS sets）. The RMSE of YZLAS sets were 21. 08 W · m-2and 12. 87 W · m-2, respectively, when compared with the measurements from eddy covariance system. These com- parisons indicated that the domestic large aperture scintillometer performed very well; （2） The domestic large aperture scintillometer also has reliable stability under harsh environments such as high and low temperature, high and low humidity conditions; （3） The sensible heat fluxes measured by YZLAS also showed good consistency with each other with diversity of about 6% and the correlation coefficient greater than 0. 98. These mean that the domestic optical large aperture scintillometer basically reached the level of the foreign instrument.