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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Validation of the hydrological cycle of ECMWF and NCEP reanalyses using the MPI hydrological discharge model
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Validation of the hydrological cycle of ECMWF and NCEP reanalyses using the MPI hydrological discharge model

机译：使用MPI水文排放模型验证ECMWF和NCEP重新分析的水文循环

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To validate the hydrological cycle of the European Centre for Medium-Range Weather Forecasts (ECMWF) and the National Centers for Environmental Prediction (NCEP) reanalyses in comparison with observed river discharge, a hydrological discharge model is used to compute the corresponding river discharge. The HD model requires daily time series of surface runoff and drainage from the soil as input fields. As it turned out that a direct application to the reanalyses was not possible, a simplified land surface scheme was developed to compute runoff and drainage fields from daily reanalysis values of total precipitation and 2 m temperature. These fields were then used as input to the global simulation of river discharge with the discharge model. Results show several shortcomings of the two reanalyses in representing the hydrological cycle at the land surface. The water balance is not closed, and the snowmelt is not incorporated in the runoff and drainage fields of either of the two reanalyses. In addition, the NCEP reanalysis overestimates summer precipitation and evapotranspiration for most parts of the Northern Hemisphere, while the ECMWF reanalysis underestimates 2 m temperatures in high latitudes during the winter and spring. In the monsoon region the hydrological cycle is well represented by both reanalyses, especially over India. [References: 33]
机译：为了验证欧洲中距离天气预报中心（ECMWF）和国家环境预测中心（NCEP）的水文循环与观测到的河流流量的比较，使用水文流量模型来计算相应的河流流量。 HD模型需要每天的地面径流和土壤排水时间序列作为输入场。由于事实证明不可能直接应用到再分析中，因此开发了一种简化的地表方案来根据每日总降水量和2 m温度的再分析值计算径流和排水场。这些字段随后用作流量模型对河流流量全局模拟的输入。结果表明，这两种再分析方法在代表陆地表面水文循环方面存在一些缺陷。水平衡没有关闭，并且两次重新分析中的任何一个的径流和排水区域都没有融雪。此外，NCEP重新分析高估了北半球大部分地区的夏季降水和蒸散量，而ECMWF重新分析低估了冬季和春季高纬地区的2 m温度。在季风地区，这两个再分析都很好地代表了水文循环，特别是在印度。 [参考：33]

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