The Effect of Spurious Cloud Edge Supersaturations in Lagrangian Cloud Models: An Analytical and Numerical Study

The Effect of Spurious Cloud Edge Supersaturations in Lagrangian Cloud Models: An Analytical and Numerical Study
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拉格朗日云模型中杂散云边缘过饱和的影响:分析和数值研究

DOI:
10.1175/mwr-d-15-0234.1
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发表时间:
2016
影响因子:
3.2
通讯作者:
Hoffmann
Hoffmann
中科院分区:
地球科学2区
文献类型:
--
作者:
Hoffmann

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本研究分析了拉格朗日云模型 (LCM) 中虚假云边缘过饱和的产生和影响,该模型将液滴和气溶胶明确模拟为拉格朗日粒子。通过应用理想化的一维设置,结果表明 LCM 和欧拉云模型中虚假云边缘过饱和的产生是相同的。然而,在 LCM 中,虚假过饱和对激活/失活粒子数量的影响会降低,因为 (i) 激活过程的物理上更合适的表示,以及 (ii) LCM 能够表示液态水在亚网格尺度上的分布。此外,还导出了拉格朗日和欧拉云模型中产生虚假过饱和的解析解,从而能够识别虚假过饱和的上限及其发生条件。
This study analyzes the production and the effect of spurious cloud edge supersaturations in Lagrangian cloud models (LCMs), which simulate droplets and aerosols explicitly as Lagrangian particles. By applying an idealized one-dimensional setup, it is shown that the production of spurious cloud edge supersaturations in LCMs and Eulerian cloud models is identical. In LCMs, however, the effect of spurious supersaturations on the number of activated/deactivated particles is decreased due to (i) a physically more appropriate representation of the activation process, and (ii) the LCM’s ability to represent the distribution of liquid water on the subgrid scale. Additionally, an analytic solution for the production of spurious supersaturations in both Lagrangian and Eulerian cloud models is derived, enabling the identification of the upper limit of spurious supersaturations and the conditions under which they occur.
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