Abstract Biotic leaf transpiration (T) and abiotic evaporation (E) are the two major pathways by which water is transferred from land surfaces to the atmosphere. Earth system models simulating the terrestrial water, carbon and energy cycle are required to reliably embed the role of soil and vegetation processes in order to realistically reproduce both fluxes including their relative contributions to total evapotranspiration (ET). Earth system models are also being used with increasing spatial resolutions to better simulate the effects of surface heterogeneity on the regional water and energy cycle and to realistically include effects of subsurface lateral flow paths, which are expected to feed back on the exchange fluxes and their partitioning in the model. Using the hydrological component of the Terrestrial Systems Modeling Platform (TerrSysMP), we examine the uncertainty in the estimates of T/ET ratio due to horizontal model grid resolution for a dry and wet year in the Inde catchment (western Germany). The aggregation of topography results in smoothing of slope magnitudes and the filtering of small-scale convergence and divergence zones, which directly impacts the surface-subsurface flow. Coarsening of the grid resolution from 120 m to 960 m increased the available soil moisture for ground evaporation, and decreased T/ET ratio by about 5% and 8% for dry and wet year respectively. The change in T/ET ratio was more pronounced for agricultural crops compared to forested areas, indicating a strong local control of vegetation on the ground evaporation, affecting the domain average statistics.

中文翻译：

---

水平网格分辨率对使用 TerrSysMP 进行蒸散分区的影响

摘要 生物叶蒸腾（T）和非生物蒸发（E）是水从地表转移到大气的两条主要途径。模拟陆地水、碳和能量循环的地球系统模型需要可靠地嵌入土壤和植被过程的作用，以便真实地再现两种通量，包括它们对总蒸发量 (ET) 的相对贡献。地球系统模型也被用于越来越高的空间分辨率，以更好地模拟地表异质性对区域水和能量循环的影响，并现实地包括地下横向流动路径的影响，这些路径预计将反馈交换通量及其分配在模型中。使用陆地系统建模平台 (TerrSysMP) 的水文组件，我们检查了因德流域（德国西部）干湿年水平模型网格分辨率导致的 T/ET 比估计的不确定性。地形的聚合导致斜坡大小的平滑和小尺度收敛和发散带的过滤，这直接影响地表-地下流动。网格分辨率从 120 m 粗化到 960 m 增加了地面蒸发的可用土壤水分，并使干湿年的 T/ET 比分别降低了约 5% 和 8%。与林区相比，农作物的 T/ET 比变化更明显，表明植被对地面蒸发的局部控制很强，影响了域平均统计数据。