大孔径闪烁仪观测数据在陆面模式验证中的应用初探

A Preliminary Study of the Validation of Land Surface Models with Large Aperture Scintillometer Data

将大孔径闪烁仪(LAS)观测数据应用在陆面模式验证中对更好地认识和描述陆面过程在气候变化中的作用有着重要意义。以中国北方2个LAS观测站——密云和阿柔为例,分别设定一个公里尺度(1 km2)的研究区域,采用陆面模式SiB2,综合利用站点观测数据、实地调查数据及卫星遥感数据,对陆面过程进行了模拟,并利用LAS和涡动相关仪(EC)观测的显热通量对模拟结果进行了评估,结果表明:SiB2模式能够对阿柔和密云显热通量的总体情况、日变化情况及季节变化情况进行较好的模拟;利用LAS显热通量进行较大尺度模拟验证,能够在很大程度上避免EC能量不闭合及其观测尺度与模式模拟尺度不匹配在验证中所造成的偏差,验证效果更好。

The application of large aperture scintillometer observations to the validation of land surface models has important significances in better understanding and describing the influences of land surface processes on climate change.With observational data from stations,field survey data,and remote sensing data,the land surface processes of Miyun and Arou,two typical flux observation stations in northern China,were simulated by SiB2 model at the spatial scale of 1km2.The simulation was validated by the sensible heat fluxes obtained by Large Aperture Scintillometer（LAS） and Eddy Covariance measurement（EC）.The results showed that： ①SiB2 has given a good simulation of the sensible heat flux as well as its diurnal variation and seasonal variation;②The validation of large scale simulation by LAS can avoid the disadvantage of EC,such as energy disclosure and spatial scale differences with model simulation,and could give better results.