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首页> 外文期刊>Atmospheric chemistry and physics >How important is the vertical structure for the representation of aerosol impacts on the diurnal cycle of marine stratocumulus?
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How important is the vertical structure for the representation of aerosol impacts on the diurnal cycle of marine stratocumulus?

机译：垂直结构对于表示气溶胶对海洋平积层日周期的影响有多重要？

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Large-Eddy Simulations (LES) are performed to examine the impact ofhygroscopic aerosols on the diurnal cycle of marine stratocumulus clouds,under varying meteorological forcing conditions. When the cloud condensationnuclei concentration increase is sufficient to inhibit drizzle formation inthe cloud layer, the precipitating and the non-precipitating cloud layersexhibit contrasting evolutions, with noticeable differences in liquid waterpath. Aerosol-induced modifications of the droplet sedimentation and drizzleprecipitation result in noticeable changes of the entrainment velocity atcloud top, but also in significant changes of the vertical stratification inthe boundary layer. This set of simulations is then used to evaluate whethera model which does not explicitly represent the effects of the interactionsoccurring within the boundary layer on its vertical stratification (i.e.such as a mixed-layer model) is capable of reproducing at least the sign, ifnot the amplitude, of these aerosol impacts on the liquid water path. It isshown that the evolution of the vertical structure is key to the responses wesimulate, and must be considered in bulk models that wish to predict theimpact of aerosol perturbations on the radiative properties ofstratocumulus-topped boundary layers.
机译：在不同的气象强迫条件下，进行大涡模拟（LES）以研究吸湿性气溶胶对海洋平积云日周期的影响。当云的凝结核浓度增加足以抑制云层中的毛毛雨形成时，降水云层和非降水云层会显示出相反的演变过程，其中液体水径存在明显差异。气溶胶引起的液滴沉降和毛毛雨沉淀的改变导致云顶夹带速度的显着变化，但边界层的垂直分层也发生了显着变化。然后，使用该组模拟评估未明确表示边界层中发生的相互作用对其垂直分层的影响的模型（例如混合层模型）是否至少能够再现符号（如果不是）。这些气溶胶的振幅对液态水路径的影响。结果表明，垂直结构的演化是我们模拟响应的关键，必须在整体模型中加以考虑，这些模型希望预测气溶胶扰动对顶积层边界层辐射特性的影响。

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