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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Improvements to the Community Land Model and their impact on the hydrological cycle
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Improvements to the Community Land Model and their impact on the hydrological cycle

机译：社区土地模型的改进及其对水文循环的影响

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The Community Land Model version 3 (CLM3) is the land component of the Community Climate System Model (CCSM). CLM3 has energy and water biases resulting from deficiencies in some of its canopy and soil parameterizations related to hydrological processes. Recent research by the community that utilizes CLM3 and the family of CCSM models has indicated several promising approaches to alleviating these biases. This paper describes the implementation of a selected set of these parameterizations and their effects on the simulated hydrological cycle. The modifications consist of surface data sets based on Moderate Resolution Imaging Spectroradiometer products, new parameterizations for canopy integration, canopy interception, frozen soil, soil water availability, and soil evaporation, a TOPMODEL-based model for surface and subsurface runoff, a groundwater model for determining water table depth, and the introduction of a factor to simulate nitrogen limitation on plant productivity. The results from a set of offline simulations were compared with observed data for runoff, river discharge, soil moisture, and total water storage to assess the performance of the new model (referred to as CLM3.5). CLM3.5 exhibits significant improvements in its partitioning of global evapotranspiration (ET) which result in wetter soils, less plant water stress, increased transpiration and photosynthesis, and an improved annual cycle of total water storage. Phase and amplitude of the runoff annual cycle is generally improved. Dramatic improvements in vegetation biogeography result when CLM3.5 is coupled to a dynamic global vegetation model. Lower than observed soil moisture variability in the rooting zone is noted as a remaining deficiency.
机译：社区土地模型版本3（CLM3）是社区气候系统模型（CCSM）的土地组成部分。 CLM3由于与水文过程相关的某些冠层和土壤参数化设置不足而导致能量和水的偏差。利用CLM3和CCSM模型家族的社区最近的研究表明了减轻这些偏差的几种有前途的方法。本文介绍了这些参数化的选定集合的实现及其对模拟水文循环的影响。修改内容包括基于中等分辨率成像光谱仪产品的地表数据集，用于冠层集成，冠层截留，冻土，土壤水分可用性和土壤蒸发的新参数化，基于TOPMODEL的地表和地下径流模型，用于地下水的地下水模型确定地下水位深度，并引入模拟氮限制植物生产力的因素。将一组离线模拟的结果与径流，河流流量，土壤湿度和总储水量的观测数据进行比较，以评估新模型的性能（称为CLM3.5）。 CLM3.5在分配全球蒸散量（ET）方面显示出显着的改进，可导致土壤更湿，植物水分胁迫减少，蒸腾作用和光合作用增加，以及总储水量的年度改善。径流年周期的相位和幅度通常得到改善。当CLM3.5与动态全球植被模型耦合时，植被生物地理学得到了显着改善。低于生根区域的土壤水分变异性被认为是仍然存在的不足。

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