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IMPROVEMENTS TO AN END-MEMBER-BASED TWO-SOURCE APPROACH FOR ESTIMATING GLOBAL EVAPOTRANSPIRATION

文献类型: 会议论文

第一作者: Shengli Wang

作者: Shengli Wang 1 ; Ronglin Tang 1 ; Yazhen Jiang 1 ; Meng Liu 2 ;

作者机构: 1.State Key Laboratory of Resources and Environment Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences

2.Key Laboratory of Agri-informatics, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences

关键词: Evapotranspiration;ESVEP;Resistance;MODIS

会议名称: IEEE International Geoscience and Remote Sensing Symposium

主办单位:

页码: 1865-1868

摘要: Evapotranspiration (ET), including soil evaporation and vegetation transpiration, is a vital component of the water cycle and energy exchange. The end-member-based soil and vegetation energy partitioning approach (ESVEP model) for estimating ET is the first model considering the differing responses of soil water content at the upper surface layer and at the deeper root zone layer. In this paper, we have improved the ESVEP model by 1) improving estimates of canopy resistance from three parts: stomatal conductance, cuticular conductance and leaf boundary-layer conductance; 2) adding the influence of atmosphere pressure and atmosphere temperature on resistance; 3) dividing aerodynamic resistance into convective resistance and radiative heat transfer resistance. Compared to the original ESVEP model, the improved algorithm is more applicable for different biome types and has a great potential in operational estimation of regional and global evapotranspiration. Due to the underestimation of soil temperature, the estimated ET is biased, which means that the biome properties and resistance are required to be further reparameterized in future study.

分类号: tp7-53

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