The subsurface–land surface–atmosphere connection under convective conditions
The subsurface–land surface–atmosphere connection under convective conditions
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DOI：
10.1016/j.advwatres.2015.06.003
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发表时间：
2015-09
影响因子：
4.7
通讯作者：
M. Rahman;M. Sulis;S. Kollet
中科院分区：
文献类型：
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作者：
M. Rahman;M. Sulis;S. Kollet
自由地下水位的动态影响陆地表层土壤水分和能量平衡组成部分，因此也与大气过程有关。在这项研究中，大气的敏感性地下水位动态引起的陆面过程的非均匀性在对流条件下进行了检查。在德国西部一个150 km × 150 km的研究区域应用了一个完全耦合的次表层-地表-大气模式，并对两个对流降水事件进行了集合模拟，考虑了两个基于地下水位动态的独立模式配置。系综是通过改变模型大气初始条件后，由德国气象局规定的系综生成方法，以考虑到固有的，内部的大气变化。结果表明，特别是在强对流条件下，地下水位动态通过与地表土壤水分和能量通量的耦合，影响大气边界层高度、对流有效位能和降水。因此，这项研究表明，系统的不确定性可能会引入大气模拟，如果地下水位动态被忽略的模式。
The dynamics of the free groundwater table influence land surface soil moisture and energy balance components, and are therefore also linked to atmospheric processes. In this study, the sensitivity of the atmosphere to groundwater table dynamics induced heterogeneity in land surface processes is examined under convective conditions. A fully coupled subsurface–land surface–atmosphere model is applied over a 150 km × 150 km study area located in Western Germany and ensemble simulations are performed over two convective precipitation events considering two separate model configurations based on groundwater table dynamics. Ensembles are generated by varying the model atmospheric initial conditions following the prescribed ensemble generation method by the German Weather Service in order to account for the intrinsic, internal atmospheric variability. The results demonstrate that especially under strong convective conditions, groundwater table dynamics affect atmospheric boundary layer height, convective available potential energy, and precipitation via the coupling with land surface soil moisture and energy fluxes. Thus, this study suggests that systematic uncertainties may be introduced to atmospheric simulations if groundwater table dynamics are neglected in the model.