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首页> 外文期刊>Journal of hydrometeorology >Investigating the Impact of Soil Moisture and Atmospheric Stability on Cloud Development and Distribution Using a Coupled Large-Eddy Simulation and Land Surface Model
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Investigating the Impact of Soil Moisture and Atmospheric Stability on Cloud Development and Distribution Using a Coupled Large-Eddy Simulation and Land Surface Model

机译：结合大涡模拟和地表模型研究土壤水分和大气稳定性对云发展和分布的影响

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摘要

The influence of soil moisture and atmospheric thermal stability on surface fluxes, boundary layer characteristics, and cloud development are investigated using a coupled large-eddy simulation (LES)–land surface model (LSM) framework. The study day from the Cabauw site in the central part of the Netherlands has been studied to examine the soil moisture–cloud feedback using a parameterized single-column model (SCM) in previous work. Good agreement is seen in the comparison between coupled model results and observations collected at the Cabauw eddy-covariance tower. Simulation results confirm the hypothesis that both surface fluxes and atmospheric boundary layer (ABL) states are strongly affected by soil moisture and atmospheric stability, which was proposed by a previous study using an SCM with simple parameterization. While the ABL-top cloud development is a nonmonotonic function of surface water content under different thermal stability conditions, coupled model simulations find that weak thermal stability has significant impacts on both thermal and moisture fluxes and variances near the entrainment zone, especially for the dry surface cases. Additionally, the impacts of ABL-top stability on thermal and moisture entrainment processes are in a different magnitude. The explicitly resolved cloud cover fraction increases with increasing soil moisture only occurs in cases with strong atmospheric stability, and an opposite result is seen when weak atmospheric stability exists. The elevation of cloud base highly depends on the strength of sensible heat flux. However, results of cloud thickness show that a dry surface with weak thermal stability is able to form a large amount of cumulus cloud, even if the soil provides less water vapor.
机译：利用耦合的大涡模拟（LES）-土地表面模型（LSM）框架研究了土壤水分和大气热稳定性对表面通量，边界层特征和云团发展的影响。在以前的工作中，已经对来自荷兰中部Cabauw站点的研究日进行了研究，以使用参数化单列模型（SCM）来检查土壤湿度-云量反馈。在耦合模型结果与Cabauw涡度-协方差塔收集的观测值的比较中，可以看到良好的一致性。仿真结果证实了这样的假设，即表面通量和大气边界层（ABL）的状态都受到土壤水分和大气稳定性的强烈影响，这是以前的研究使用简单参数化的SCM提出的。虽然ABL顶云的发展是在不同热稳定性条件下地表水含量的非单调函数，但耦合模型仿真发现，弱热稳定性对夹带附近的热通量和湿气通量以及方差都有重大影响，特别是对于干燥表面案件。此外，ABL顶部稳定性对热量和水分夹带过程的影响程度不同。明确分辨的云量分数随土壤湿度的增加而增加，仅在大气稳定性强的情况下才会发生，而在大气稳定性弱的情况下会出现相反的结果。云层的高度高度取决于显热通量的强度。但是，云层厚度的结果表明，即使土壤提供的水蒸气较少，干燥的热稳定性差的表面也能够形成大量的积云。

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