Knowledge Management System of Northwest Institute of Plateau Biology, CAS
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 |
卷号 | 27期号:16页码:3487-3498 |
文章类型 | Article |
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. |
关键词 | Regional-scale Heat-flux |
WOS标题词 | Science & Technology ; Technology |
学科领域 | 生物科学 |
关键词[WOS] | REGIONAL-SCALE ; HEAT-FLUX |
收录类别 | SCI |
语种 | 英语 |
WOS研究方向 | Remote Sensing ; Imaging Science & Photographic Technology |
WOS类目 | Remote Sensing ; Imaging Science & Photographic Technology |
WOS记录号 | WOS:000239535000010 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://210.75.249.4/handle/363003/1324 |
专题 | 中国科学院西北高原生物研究所 |
作者单位 | 1.CAS, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 3.CAS, NW Inst Plateau Biol, Xining 810001, Peoples R China |
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,2006,27(16):3487-3498. |
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,27(16),3487-3498. |
MLA | Li, Zhengquan,et al."Effect of spatial variation on areal evapotranspiration simulation in Haibei, Tibet plateau, China".INTERNATIONAL JOURNAL OF REMOTE SENSING 27.16(2006):3487-3498. |
条目包含的文件 | 下载所有文件 | |||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
2006Effect of spatia(531KB) | 开放获取 | 使用许可 | 浏览 下载 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论