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为研究干旱半干旱区蒸散发量,以新疆为研究区域,基于地表能量平衡,依据地表温度与反照率关系确定蒸发比,利用MODIS影像遥感估算新疆地区的蒸散发量。通过野外验证,模拟蒸散量与涡度相关仪野外观测量一致,平均误差在0.40mm/d。在干旱区,蒸散发量与降水的相关性在82%,与气温的相关性分别为46%。通过模型反演,2005年研究区在空间上以裸土蒸发为主,蒸发量在0-2mm/d之间,主要在塔里木盆地、准噶尔盆地和吐鲁番盆地,而蒸散发量较高地区主要为天山山脉下垫面为林地草地和平原绿洲农田区域,蒸散发量最大达6mm/d。
In order to study the evapotranspiration in arid and semi-arid regions, Xinjiang was chosen as the study area. Based on the surface energy balance, the evaporation ratio was determined based on the relationship between surface temperature and albedo, and the evapotranspiration was estimated using MODIS remote sensing images. Field validation demonstrated that the simulated evapotranspiration was in agreement with the appearance of the eddy covariance field with an average error of 0.40 mm / d. In arid regions, the correlation between evapotranspiration and precipitation is 82%, and the correlation with temperature is respectively 46%. Through model inversion, the bare soil was dominated by space evaporation in 2005, and the evaporation was between 0-2mm / d, mainly in the Tarim Basin, Junggar Basin and Turpan Basin. The areas with high evapotranspiration were The underlying surface of the Tianshan Mountains is the grassland and plains oasis farmlands, the largest amount of evapotranspiration 6mm / d.