The Monte-Carlo ice microphysics model McSnow is extended by an explicit habit prediction scheme, combined with the hydrodynamic theory of Böhm. Böhm's original cylindrical shape assumption for prolates is compared against recent lab results, showing that interpolation between cylinder and prolate yields the best agreement. For constant temperature and supersaturation, the predicted mass, size, and density of the ice crystals agree well with the laboratory results, and a comparison with real clouds using the polarizability ratio shows regimes capable of improvement. An updated form of the inherent growth function to describe the primary habit growth tendencies is proposed and combined with a habit-dependent ventilation coefficient. The modifications contrast the results from general mass size relations and significantly impact the main ice microphysical processes. Depending on the thermodynamic regime, ice habits significantly alter depositional growth and affect aggregation and riming. The influence of primary ice behavior on precipitation formation needs to be considered in future development of microphysical parameterizations, but the consideration of secondary habits and the geometry of aggregates should be further improved in future work.

中文翻译：

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拉格朗日超粒子冰微物理模型 McSnow 中的显式习惯预测

蒙特卡洛冰微物理模型 McSnow 通过明确的习惯预测方案并结合 Böhm 的流体动力学理论进行了扩展。将 Böhm 对长椭圆形的原始圆柱形状假设与最近的实验室结果进行了比较，表明圆柱和长椭圆形之间的插值产生了最佳一致性。对于恒定温度和过饱和度，预测的冰晶质量、尺寸和密度与实验室结果非常吻合，并且使用极化率与真实云进行比较表明可以改进。提出了描述主要习惯生长趋势的固有生长函数的更新形式，并与习惯相关的通风系数相结合。这些修改与一般质量尺寸关系的结果形成对比，并显着影响主要的冰微物理过程。根据热力学状态，冰习性显着改变沉积生长并影响聚集和边缘。在未来微物理参数化的发展中需要考虑原生冰行为对降水形成的影响，但在未来的工作中应进一步改进对次生冰习性和聚集体几何形状的考虑。