卫星遥感确定沙特阿拉伯吉达地区非均匀地表区域地表参数和能量通量

Determination of Regional Land Surface Parameters and Heat Fluxes over Heterogeneous Landscape of Jiddah Area of Saudi Arabia by Using Satellite Remote Sensing Data

对临海沙漠地区非均匀地表区域地表能量通量和蒸发(蒸散)的研究,是一个十分重要但又是一个难点问题。本文提出了1个基于卫星遥感和地面观测的参数化方案,并把其应用于沙特阿拉伯吉达地区,利用1个景的陆地资源卫星Landsat-7ETM+资料进行了分析研究,得到了一些有关临海沙漠地区非均匀地表区域地表特征参数、植被参数和地表能量通量的新概念。最后讨论了所提出的参数化方案的适用范围和需改进之处。

Dealing with the regional land surface heat fluxes over heterogeneous landscape of desertification area near sea is very important and not an easy problem. In this study,a parameterization method based on Landsat-7 ETM^+ data and field observations is described and tested for deriving the regional land surface variables,vegetation variables and land surface heat fluxes over heterogeneous landscape.As case study, the method is applied to Jiddah area of Saudi Arabia. The regional distributions of surface reflectance,NDVI,MSAVI,vegetation coverage,LAI,surface temperature, net radiation, soil heat flux, sensible heat flux and latent heat flux have been determined over Jiddah area. The derived results have been validated by using the 'ground truth'. The results show that the more reasonable regional distributions of land surface variables (surface reflectance, surface temperature), vegetation variables (MSAVI and vegetation coverage), net radiation, soil heat flux and sensible heat flux can be obtained by using the method proposed in this study. Further improvement of the method is also discussed.