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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Parameterization of cloud droplet formation in global climate models - art. no. 4415
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Parameterization of cloud droplet formation in global climate models - art. no. 4415

机译：全球气候模型中云滴形成的参数化-艺术。没有。 4415

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1] An aerosol activation parameterization has been developed based on a generalized representation of aerosol size and composition within the framework of an ascending adiabatic parcel; this allows for parameterizing the activation of chemically complex aerosol with an arbitrary size distribution and mixing state. The new parameterization introduces the concept of "population splitting,'' in which the cloud condensation nuclei (CCN) that form droplets are treated as two separate populations: those that have a size close to their critical diameter and those that do not. Explicit consideration of kinetic limitations on droplet growth is introduced. Our treatment of the activation process unravels much of its complexity. As a result of this, a substantial number of conditions of droplet formation can be treated completely free of empirical information or correlations; there are, however, some conditions of droplet activation for which an empirically derived correlation is utilized. Predictions of the parameterization are compared against extensive cloud parcel model simulations for a variety of aerosol activation conditions that cover a wide range of chemical variability and CCN concentrations. The parameterization tracks the parcel model simulations closely and robustly. The parameterization presented here is intended to allow for a comprehensive assessment of the aerosol indirect effect in general circulation models. [References: 37
机译：1]在上升绝热包裹的框架内，基于气雾大小和成分的一般表示，开发了气雾激活参数化方法;这可以对具有任意尺寸分布和混合状态的化学复合气溶胶的活化进行参数化。新的参数化引入了“种群分裂”的概念，其中将形成液滴的云凝结核（CCN）视为两个单独的种群：大小接近其临界直径的种群和不接近临界直径的种群。引入了对液滴生长的动力学限制，我们对活化过程的处理揭示了其复杂性，因此，可以完全没有经验信息或相关性的情况下处理大量液滴形成的条件;但是，利用经验推导得出的相关性，对液滴活化的一些条件进行了比较，并将参数化的预测结果与广泛的云包裹模型模拟进行了比较，以模拟涵盖多种化学变化性和CCN浓度的多种气溶胶活化条件。包裹模型仿真紧密而稳健地进行。此处的目的是为了全面评估一般循环模型中的气溶胶间接作用。 [参考：37

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