Influence of runoff parameterization on continental hydrology: Comparison between the Noah and the ISBA land surface models
Influence of runoff parameterization on continental hydrology: Comparison between the Noah and the ISBA land surface models
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DOI：
10.1029/2007jd008463
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发表时间：
2007-10
影响因子：
--
通讯作者：
B. Decharme
中科院分区：
文献类型：
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作者：
B. Decharme
[1]最近在全球ISBA陆面模式中引入了一套没有任何流域尺度校准的综合水文参数化，以改进对季节性气候异常和全球变暖的水文影响的模拟。在这项研究中，同样的方法被引入到诺亚陆面模式，以提高地表径流的代表性。邓恩径流计算地形信息通过TOPMODEL方法和霍顿径流使用冻结和未冻结的土壤之间的明确区别，而土地表面的异质性通过瓦片的方法引入。使用全球土壤湿度项目大气强迫驱动的全球离线模拟，以1° × 1°的水平分辨率进行验证。模拟径流转换成排放使用TRIP河流路由模型，并从分布在世界上最大的河流流域的测量站的密集网络的观测结果进行比较。结果证实，邓恩径流和地形之间的关系，以及霍顿径流和冻土之间的关系，是模拟现实的全球河流流量的主要水文过程。诺亚和ISBA的旧版本和新版本之间的比较表明，模型的差异，在水通量生产方面，是全球性的减少，由于使用类似的地表水文，导致类似的改善排放分数。这证实了这些地表水文过程对区域和全球应用的相关性。
[1] A comprehensive set of hydrological parameterizations without any basin-scale calibration was recently introduced into the global ISBA land surface model in order to improve the simulation of the hydrological impacts of both seasonal climate anomalies and global warming. In this study, the same approach is introduced into the Noah land surface model, in order to improve the representation of surface runoff. The Dunne runoff is computed using topographic information via a TOPMODEL approach and the Horton runoff using an explicit distinction between frozen and unfrozen soils, while land surface heterogeneities are introduced via a tile approach. The validation is conducted at a 1° by 1° horizontal resolution using global off line simulations that were driven by Global Soil Wetness Project atmospheric forcing. The simulated runoff is converted into discharges using the TRIP river routing model and compared to observations from a dense network of gauging stations distributed over the world's largest river basins. Results confirm that the relationships between the Dunne runoff and the topography, as well as between the Horton runoff and the frozen soils, are among the main hydrological processes to simulate realistic global river discharges. The comparison between the old and the new versions of Noah and ISBA reveal that the model disparity, in term of water flux production, is globally reduced due to the use of similar surface hydrology that lead to comparable improvements of discharge scores. This confirms the relevance of these surface hydrological processes for regional and global applications.