大尺度水热通量观测系统的研制  

Development of a Measuring System for Surface Energy and Water Vapor Fluxes at Large Scale

作　　者：施生锦[1] 黄彬香[1] 刘绍民[2] 杨燕[1] 黄勇彬 徐自为[2] 

机构地区：[1]中国农业大学资源与环境学院,北京100193 [2]北京师范大学遥感科学国家重点实验室,地理学与遥感科学学院,北京100875 [3]北京雨根科技有限公司,北京101100

出　　处：《地球科学进展》2010年第11期1128-1138,共11页Advances in Earth Science

基　　金：公益性行业(气象)科研专项“大尺度水热通量观测系统的研制与应用研究”(编号:GYHY200706046);国家自然科学基金项目“地表水热通量的时空尺度扩展研究”(编号:40971194)和“基于遥感和数据同化方法的海河流域水文通量预测研究-SP2:不同尺度蒸散量和土壤水分的观测研究”(编号:30911130504)资助

摘　　要：基于闪烁理论、孔径平均效应及莫宁—奥布霍夫相似理论(MOST),成功研制了大尺度水热通量观测系统样机YZ01,该系统主要由发射器、接收器、云台、瞄准器、气象传感器、数据采集器、数据处理软件、远程无线数据传输模块、太阳能供电系统等部分组成。该系统发射器平均功耗3W,接收器功耗1.8 W,比德国的BLS450和荷兰的LAS都更省电;发射器光源功率为100 mW,比荷兰LAS的80 mW更强,在同样条件下,YZ01接收器接收到的闪烁光解调信号比荷兰LAS强14%左右,说明在相同的安装距离下,YZ01比荷兰LAS更适于在能见度低的条件下使用,或者说在同样的环境条件下,YZ01比荷兰LAS可以测量更远的距离。YZ01在北京密云站与荷兰K ipp&Zonen公司的LAS、美国Campbell公司的涡度相关测定系统进行了短期的应用对比试验,结果为:空气折射指数的结构参数C2n、感热通量H、潜热通量LE的日变化趋势都非常一致;YZ01与LAS之间C2n的线性拟合系数为0.98,相关系数为0.7;H的线性拟合系数为0.90,相关系数为0.93;YZ01通过余项法算出的LE与涡度相关直接测得的LE的线性拟合系数为1.07,相关系数为0.78。YZ01在青海阿柔站与德国Scintec公司的BLS450进行对比结果为:空气折射指数的结构参数C2n、感热通量H、潜热通量LE的日变化变化趋势也都非常一致,YZ01与BLS450之间C2n的线性拟合系数为1.25,相关系数为0.93;H的线性拟合系数为1.17,相关系数为0.99;YZ01通过余项法算出的LE与涡度相关测定系统测得的LE的线性拟合系数为1.03,相关系数为0.84。表明该研究所研制的大尺度水热通量观测系统不仅可以达到国外同类仪器同样的应用水平,而且比国外同类产品更省电、比荷兰LAS更适应在低能见度条件下使用。Based on the extension of the first-order perturbation theory of optical scintillation and Monin-Obukhov similarity theory,an apparatus YZ01 for measuring the refractive index structure constant C2n and for measuring surface fluxes,such as sensible heat flux and latent heat flux along a long line-of-sight path,was developed.This apparatus consists of a transmitter part,a receiver part,an optical alignment part and a signal processing part.Signal modulation and demodulation method is used to distinguish the EM signal from background radiation.Filter and feedback circuitry is used to increase signal to noise ratio.The power of YZ01 transmitter is 3W average,and the receiver only 1.8W.The feature and accuracy of YZ01 was tested by comparing with Kipp Zonen LAS and Scintec BLS450 over Miyun site,Beijing and Arou site,Qinghai.The results showed： ①The modulate signal of YZ01 is about 14% stronger than KippZonen LAS over Miyun site.②The slope of linear regression and the correlation coefficient of C2n between YZ01 and LAS is 0.98 and 0.7 over Miyun site.③The slope of linear regression and the correlation coefficient of H between YZ01 and LAS is 0.90 and 0.93 over Miyun site.④The slope of linear regression and the correlation coefficient of LE between YZ01 and LAS is 1.07 and 0.78 over Miyun site.⑤The slope of linear regression and the correlation coefficient of C2n between YZ01 and BLS450 is 1.25 and 0.93 over Arou site.⑥The slope of linear regression and the correlation coefficient of H between YZ01 and BLS450 is 1.17 and 0.99 over Arou site.⑦The slope of linear regression and the correlation coefficient of LE between YZ01 and BLS450 is 1.03 and 0.84 over Arou site.

关 键 词：大尺度水热通量观测系统 感热通量 潜热通量 

分 类 号：P404[天文地球—大气科学及气象学]