Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China

NWIPB OpenIR

	Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China
	Li, Zhengquan ; Yu, Guirui ; Li, Qingkang ; Fu, Yuling ; Li, Yingnian
	2006-08-20
发表期刊	INTERNATIONAL JOURNAL OF REMOTE SENSING ; Li Zhengquan, Yu Guirui,Li Qingkang,Fu Yuling, Li Yingnian.Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China.INTERNATIONAL JOURNAL OF REMOTE SENSING,2006,27(16):3487-3498
摘要	Quantification of areal evapotranspiration from remote sensing data requires the determination of surface energy balance components with support of field observations. Much attention should be given to spatial resolution sensitivity to the physics of surface heterogeneity. Using the Priestley-Taylor model, we generated evapotranspiration maps at several spatial resolutions for a heterogeneous area at Haibei, and validated the evapotranspiration maps with the flux tower data. The results suggested that the mean values for all evapotranspiration maps were quite similar but their standard deviations decreased with the coarsening of spatial resolution. When the resolution transcended about 480 m, the standard deviations drastically decreased, indicating a loss of spatial structure information of the original resolution evapotranspiration map. The absolute values of relative errors of the points for evapotranspiration maps showed a fluctuant trend as spatial resolution of input parameter data layers coarsening, and the absolute value of relative errors reached minimum when pixel size of map matched up to measuring scale of eddy covariance system. Finally, based on the analyses of the semi-variogram of the original resolution evapotranspiration map and the shapes of spatial autocorrelation indices of Moran and Geary for evapotranspiration maps at different resolutions, an appropriate resolution was suggested for the areal evapotranspiration simulation in this study area.; Quantification of areal evapotranspiration from remote sensing data requires the determination of surface energy balance components with support of field observations. Much attention should be given to spatial resolution sensitivity to the physics of surface heterogeneity. Using the Priestley-Taylor model, we generated evapotranspiration maps at several spatial resolutions for a heterogeneous area at Haibei, and validated the evapotranspiration maps with the flux tower data. The results suggested that the mean values for all evapotranspiration maps were quite similar but their standard deviations decreased with the coarsening of spatial resolution. When the resolution transcended about 480 m, the standard deviations drastically decreased, indicating a loss of spatial structure information of the original resolution evapotranspiration map. The absolute values of relative errors of the points for evapotranspiration maps showed a fluctuant trend as spatial resolution of input parameter data layers coarsening, and the absolute value of relative errors reached minimum when pixel size of map matched up to measuring scale of eddy covariance system. Finally, based on the analyses of the semi-variogram of the original resolution evapotranspiration map and the shapes of spatial autocorrelation indices of Moran and Geary for evapotranspiration maps at different resolutions, an appropriate resolution was suggested for the areal evapotranspiration simulation in this study area.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/15160
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Li, Zhengquan,Yu, Guirui,Li, Qingkang,et al. Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China[J]. INTERNATIONAL JOURNAL OF REMOTE SENSING, Li Zhengquan, Yu Guirui,Li Qingkang,Fu Yuling, Li Yingnian.Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China.INTERNATIONAL JOURNAL OF REMOTE SENSING,2006,27(16):3487-3498,2006.
APA	Li, Zhengquan,Yu, Guirui,Li, Qingkang,Fu, Yuling,&Li, Yingnian.(2006).Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China.INTERNATIONAL JOURNAL OF REMOTE SENSING.
MLA	Li, Zhengquan,et al."Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China".INTERNATIONAL JOURNAL OF REMOTE SENSING (2006).