HEIFE非均匀陆面上区域能量平衡研究

The Study of Regional Surface Heat Fluxes over the Heterogenous Landscape of HEIFE

卫星遥感在研究非均匀陆面上地－气间能量和水循环过程时有其独到的作用。本文介绍了一种利用陆地资源卫星ＴＭ资料进行非均匀陆面上区域能量平衡研究的参数化方案。以两个景的ＴＭ资料（１９９１年７月９日，夏季；１９９１年１０月２９日，近冬季）为个例，结合“黑河实验”（ＨＥＩＦＥ）期间的地面观测资料分析研究了实验区非均匀陆面上地表特征参数（地表反射率、标准化差值植被指数和地表温度）及能量平衡各分量（地表净辐射通量、土壤热通量、感热和潜热通量）的区域分布及季节差异，同时将所得的结果与地面观测的“真值”作了比较。结果表明：（１）由于黑河实验区下垫面状况十分复杂，戈壁、沙漠与绿洲交错分布，故在整个实验区内各地表特征参数及能量平衡各分量的分布范围亦比较宽；（２）地表特征参数及能量平衡各分量在实验区的绿洲、戈壁及沙漠上各有其特定的代表值；（３）地表能量平衡各分量的区域平均值在整个实验区内基本平衡；（４）夏季与近冬季的地表特征参数及能量平衡各分量的分布特征存在着显著差异。所得的这些结果与地面观测的“真值”和局地研究的结论基本一致。这些分析对非均匀下垫面中尺度模式陆面过程参数化方案的建立以及模式预报效果的检验都具有不可缺少的重要意义。?

To improve understanding of the processes of heterogenous land surface-atmosphere interaction, the utilization of satellite remote sensing is indispensable The distribution characteristics of surface heat fluxes in the heterogeneous land scape of HEIFE were analyzed with the aid of satellite remote sensing and field observation in this paper The results show that the reasonable regional distribution of surface albedo, I ndv and surface temperature, net radiation, soil heat flux, sensible and latent heat flux can be derived with the aid of remote sensing and the field observation This technique is still in a developing stage, it was also discussed in this paper