Lateral terrestrial water flow contribution to summer precipitation at continental scale – A comparison between Europe and West Africa with WRF-Hydro-tag ensembles,Hydrological Processes

当前位置： X-MOL 学术 › Hydrol. Process. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Lateral terrestrial water flow contribution to summer precipitation at continental scale – A comparison between Europe and West Africa with WRF-Hydro-tag ensembles
Hydrological Processes ( IF 2.8 ) Pub Date : 2021-04-21 , DOI: 10.1002/hyp.14183
Joël Arnault ₁ , Benjamin Fersch ₁ , Thomas Rummler ₂ , Zhenyu Zhang _{1,

2} , Gandome Mayeul Quenum ₃ , Jianhui Wei ₁ , Maximilian Graf _{1,

2} , Patrick Laux _{1,

2} , Harald Kunstmann _{1,

2}

Affiliation

It is well accepted that summer precipitation can be altered by soil moisture condition. Coupled land surface – atmospheric models have been routinely used to quantify soil moisture – precipitation feedback processes. However, most of the land surface models (LSMs) assume a vertical soil water transport and neglect lateral terrestrial water flow at the surface and in the subsurface, which potentially reduces the realism of the simulated soil moisture – precipitation feedback. In this study, the contribution of lateral terrestrial water flow to summer precipitation is assessed in two different climatic regions, Europe and West Africa, for the period June–September 2008. A version of the coupled atmospheric-hydrological model WRF-Hydro with an option to tag and trace land surface evaporation in the modelled atmosphere, named WRF-Hydro-tag, is employed. An ensemble of 30 simulations with terrestrial routing and 30 simulations without terrestrial routing is generated with random realizations of turbulent energy with the stochastic kinetic energy backscatter scheme, for both Europe and West Africa. The ensemble size allows to extract random noise from continental-scale averaged modelled precipitation. It is found that lateral terrestrial water flow increases the relative contribution of land surface evaporation to precipitation by 3.6% in Europe and 5.6% in West Africa, which enhances a positive soil moisture – precipitation feedback and generates more uncertainty in modelled precipitation, as diagnosed by a slight increase in normalized ensemble spread. This study demonstrates the small but non-negligible contribution of lateral terrestrial water flow to precipitation at continental scale.

中文翻译：

横向陆地水流量对大陆范围内夏季降水的贡献–欧洲和西非与WRF-Hydro-tag合奏的比较

众所周知，夏季降水会因土壤湿度条件而改变。常规使用耦合的地表-大气模型来量化土壤水分-降水反馈过程。但是，大多数陆地表面模型（LSM）都假定土壤是垂直的水运输，而忽略了地表和地下的横向陆地水流，这有可能降低了模拟土壤水分的真实性-降水反馈。在这项研究中，在2008年6月至9月的两个不同气候区域（欧洲和西非）评估了陆地横向水流对夏季降水的贡献。用来标记和追踪模拟大气中的地表蒸发，称为WRF-Hydro-tag，被雇用。对于欧洲和西非，通过随机动能反向散射方案随机实现湍流能量，生成了30个具有地面路由的模拟和30个没有地面路由的模拟的集合。集合大小可以从大陆平均建模降水中提取随机噪声。研究发现，横向陆地水流使欧洲地表蒸发对降水的相对贡献增加了3.6％，而西非则增加了5.6％，这增强了土壤的正湿度-降水反馈，并在模拟降水中产生了更多的不确定性，这一点被诊断为标准化合奏散布略有增加。

更新日期：2021-05-22

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11