Aerosol Effects of the Condensation Process on a Convective Cloud Simulation
Aerosol Effects of the Condensation Process on a Convective Cloud Simulation
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DOI：
10.1175/jas-d-12-0195.1
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发表时间：
2014-02-01
影响因子：
3.1
通讯作者：
Nakajima, Teruyuki
中科院分区：
文献类型：
--
作者：
Seiki, Tatsuya;Nakajima, Teruyuki
采用双矩体云微物理方案的非流体静力模型，作者引入了气溶胶通过加速凝结和蒸发过程对对流云系统的影响（气溶胶凝聚效应）。为了评估这种效应，作者采用了显式冷凝方案而不是饱和度调整方法，并提出了一种分离气溶胶冷凝效应的方法。本研究表明，气溶胶的冷凝效应不仅加速了云水的生长速度，而且增加了云水，尽管蒸发的加速程度超过了凝结的加速程度。在对流系统的早期发展阶段，云水的增加反过来又与冰相过程有关，并改变了砧云的冰水路径和冰云分数。在成熟阶段，虽然气溶胶凝聚效应与其他气溶胶效应结合时在动力反馈中起次要作用，但气溶胶凝聚效应对云微物理参数的调制程度仍然不可忽略。这些发现表明，反馈机制，如潜热释放和各种气溶胶效应的相互作用，在涉及冰相过程的对流云系统中是重要的。
Using a nonhydrostatic model with a double-moment bulk cloud microphysics scheme, the authors introduce an aerosol effect on a convective cloud system by accelerating the condensation and evaporation processes (the aerosol condensational effect). To evaluate this effect, the authors use an explicit condensation scheme rather than the saturation adjustment method and propose a method to isolate the aerosol condensational effect. This study shows that the aerosol condensational effect not only accelerates growth rates but also increases cloud water, even though the degree of the acceleration of evaporation exceeds that of condensation. In the early developing stage of the convective system, increased cloud water is, in turn, linked to ice-phase processes and modifies the ice water path of anvil clouds and the ice cloud fraction. In the mature stage, although the aerosol condensational effect has a secondary role in dynamical feedbacks when combined with other aerosol effects, the degree of modulation of the cloud microphysical parameters by the aerosol condensational effect continues to be nonnegligible. These findings indicate that feedback mechanisms, such as latent heat release and the interaction of various aerosol effects, are important in convective cloud systems that involve ice-phase processes.