An Intercomparison of Large‐Eddy Simulations of a Convection Cloud Chamber Using Haze‐Capable Bin and Lagrangian Cloud Microphysics Schemes
An Intercomparison of Large‐Eddy Simulations of a Convection Cloud Chamber Using Haze‐Capable Bin and Lagrangian Cloud Microphysics Schemes
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使用 Haze Capable Bin 和拉格朗日云微物理方案对对流云室的大涡模拟进行比较
DOI：
10.1029/2022ms003270
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发表时间：
2023
影响因子：
6.8
通讯作者：
Vogelmann, Andrew M.
中科院分区：
文献类型：
--
作者：
Yang, Fan;Hoffmann, Fabian;Shaw, Raymond A.;Ovchinnikov, Mikhail;Vogelmann, Andrew M.
最近的现场观测表明，对流云室中存在雾霾颗粒。以前用于云室大涡流模拟的微物理方案无法完全解析雾霾颗粒及其相关过程，包括它们的激活和失活。具体来说，云滴激活是基于Twomey型参数化进行建模的，其中当超过可用云凝结核（CCN）的临界过饱和度并且雾霾颗粒没有明确解析时，就会形成云滴。在这里，我们开发并调整了雾霾能力箱和拉格朗日微物理方案，以正确解决激活和失活过程。结果与基于 Twomey 型 CCN 的 bin 微物理方案进行了比较，其中雾霾颗粒未完全解析。我们发现，雾霾能力箱微物理方案的结果与拉格朗日微物理方案的结果非常吻合。然而，除非考虑 CCN 回收，否则这两种方案都与基于 CCN 的箱体微物理方案显着不同。由于云室中雾霾-云相互作用的正反馈，来自失活云滴回收的雾霾颗粒可以强烈增强云滴数量浓度。当考虑溶质和曲率效应时，雾度粒径分布更加真实，可以代表激活过程的完整物理过程。我们的研究表明，当过饱和度波动与平均过饱和度相当时，雾霾颗粒及其与云滴的相互作用可能会对云特性产生强烈影响，就像云室中的情况一样，也可能是大气中的情况，特别是在污染条件下。
Recent in situ observations show that haze particles exist in a convection cloud chamber. The microphysics schemes previously used for large‐eddy simulations of the cloud chamber could not fully resolve haze particles and the associated processes, including their activation and deactivation. Specifically, cloud droplet activation was modeled based on Twomey‐type parameterizations, wherein cloud droplets were formed when a critical supersaturation for the available cloud condensation nuclei (CCN) was exceeded and haze particles were not explicitly resolved. Here, we develop and adapt haze‐capable bin and Lagrangian microphysics schemes to properly resolve the activation and deactivation processes. Results are compared with the Twomey‐type CCN‐based bin microphysics scheme in which haze particles are not fully resolved. We find that results from the haze‐capable bin microphysics scheme agree well with those from the Lagrangian microphysics scheme. However, both schemes significantly differ from those from a CCN‐based bin microphysics scheme unless CCN recycling is considered. Haze particles from the recycling of deactivated cloud droplets can strongly enhance cloud droplet number concentration due to a positive feedback in haze‐cloud interactions in the cloud chamber. Haze particle size distributions are more realistic when considering solute and curvature effects that enable representing the complete physics of the activation process. Our study suggests that haze particles and their interactions with cloud droplets may have a strong impact on cloud properties when supersaturation fluctuations are comparable to mean supersaturation, as is the case in the cloud chamber and likely is the case in the atmosphere, especially in polluted conditions.
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DOI：
10.1073/pnas.2006426117
发表时间：
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期刊：
Proceedings of the National Academy of Sciences
影响因子：
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