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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Broadening of cloud droplet spectra through turbulent entrainment and eddy hopping
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Broadening of cloud droplet spectra through turbulent entrainment and eddy hopping

机译：APS -70TH流体动力学APS划分的年会 - 事件 - 通过湍流夹带和涡流跳跃扩大云液滴光谱

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This work discusses the effect of cloud turbulence and turbulent entrainment on the evolution of the cloud droplet-size spectrum. We simulate an ensemble of idealized turbulent cloud parcels that are subject to entrainment events, modeled as a random Poisson process. Entrainment events, subsequent turbulent mixing inside the parcel, supersaturation fluctuations, and the resulting stochastic droplet growth by condensation are simulated using a Monte Carlo scheme. Quantities characterizing the turbulence intensity, entrainment rate and the mean fraction of environmental air entrained in an event are specified as external parameters. Cloud microphysics is described by applying Lagrangian particles, the so-called superdroplets. They are either unactivated cloud condensation nuclei (CCN) or cloud droplets that form from activated CCN. The model accounts for the transport of environmental CCN into the cloud by the entraining eddies at the cloud edge. Turbulent mixing of the entrained dry air with cloudy air is described using a linear model. We show that turbulence plays an important role in aiding entrained CCN to activate, providing a source of small cloud droplets and thus broadening the droplet size distribution. Further simulation results will be reported at the meeting.
机译：这项工作讨论了云湍流和湍流夹带对云液滴尺寸谱的演变的影响。我们模拟了一个受到夹带事件的理想湍流云包裹的集合，被建模为随机泊松过程。使用蒙特卡罗方案模拟夹带事件，随后在包裹内部的湍流混合，过凝固，通过冷凝产生通过冷凝的随机液滴生长。表征湍流强度，夹带率和在事件中夹带的环境空气的平均分数的量被指定为外部参数。通过应用拉格朗日粒子，所谓的超级粒子来描述云微孔。它们是从活性CCN形成的未活化的云凝结核（CCN）或云液滴。该模型通过云边缘的录制漩涡将环境CCN传输到云中。使用线性模型描述夹带的干燥空气的湍流混合。我们表明湍流在辅助CCN激活的情况下起作用重要作用，提供小云液滴的源头，从而扩大液滴尺寸分布。会议将在会议上报告进一步的仿真结果。

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