摘要
获取区域的平均显热通量对水文、气象、农业有着非常重要的意义,光学仪器相比传统的仪器在测量结果代表性上有很大的优势。基于大气折射率结构常数与显热通量的关系,设计了测量大气折射率结构常数的大口径闪烁仪和反演显热通量的软件系统。用闪烁仪测量的结构常数和其他标准的气象观测(空气温度、风速、大气压力)联合起来反演地表显热通量。该仪器由一个调制的光源发射端,两个接收端组成,包括调制解调、电路滤波、数据采集、数据处理和显示单元。通过在中科院封丘农业生态站的外场实验,与传统标准仪器涡动相关仪所测显热通量对比,白天的数据相关性达到0.9以上,很好的证明该光学测量方法的科学性和可靠性,在水文、气象和农业等领域有很好的应用前景。
Area-averaged fluxes measurement is widely used in fields of agriculture,meteorology and hydrology.Compared to tradition point measurements,optical device LAS（Large aperture scintillometer） is more accurate and reasonable for test of large natural areas.Based on the relationship between the refractive index structure parameter and the sensible heat flux,the LAS to measure the refractive index structure parameter and a software to calculate the sensible heat flux are devised.The scintillation strength measured by the LAS,together with the air temperature,wind speed and air pressure are processed by software to provide the sensible flux.The instrument consists of a transmitter,two receivers.It includes modulating,demodulating,filtering circuit,data acquisition,digital filtering,data processing and display parts.The experiment was performed in the summer of 2009 at Fengqiu Agro-ecological Experiment Station,in Henan Province.As a result,a good consistency is found between the sensible heat fluxes derived from LAS and the fluxes obtained from EC instrument.It proves that the scintillation method is a reliable technique.
出处
《激光与红外》
CAS
CSCD
北大核心
2010年第12期1350-1354,共5页
Laser & Infrared
基金
中国科学院知识创新工程重要方向项目(No.KZCX-YW-411)资助
关键词
大气光学
显热通量
光闪烁法
莫宁-奥布霍夫相似理论
atmospheric optics
sensible heat flux
the scintillation method
Monin-Obukov similarity theory
