Heterogeneous Drop Freezing in the Immersion Mode: Model Calculations Considering Soluble and Insoluble Particles in the Drops
Heterogeneous Drop Freezing in the Immersion Mode: Model Calculations Considering Soluble and Insoluble Particles in the Drops
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浸没模式下的非均质液滴冻结：考虑液滴中可溶性和不溶性颗粒的模型计算
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
S. Wurzler
中科院分区：
文献类型：
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作者：
K. Diehl;S. Wurzler
提出了一种在云模型中考虑可溶性和不溶性气溶胶粒子对浸没模式下雨滴冻结的影响的方法。大多数大气气溶胶颗粒含有可溶性和不溶性物质。因此，一个更现实的液滴冻结的描述应该考虑到这两个因素。一般来说，盐颗粒会根据盐浓度降低凝固点，而不溶性颗粒会提高凝固点。在室内实验的基础上，推导了不同不溶性颗粒的中位冻结温度随液滴大小的函数关系的半经验方程。用盐溶液的活度系数确定了冰点的下降。对含溶性和不溶性颗粒的液滴冻结模型的计算结果与实验结果一致。导出了冻结速率方程，并将其纳入了具有详细截面mi的绝热空气包模型中。
Abstract A method is presented to consider the influence of both soluble and insoluble aerosol particles on drop freezing in the immersion mode in cloud models. Most atmospheric aerosol particles contain soluble and insoluble materials. Thus, a more realistic description of drop freezing should account for both factors. In general, salt particles depress the freezing point according to the salt concentration, while insoluble particles raise the freezing temperature. Based on laboratory experiments, a semiempirical equation was derived to calculate the median freezing temperature as a function of the drop size and for different insoluble particles. The freezing point depression was determined using the activity coefficients of the salt solutions. The results obtained with the freezing model for drops containing soluble and insoluble particles are consistent with experimental results. An equation for the freezing rate was derived and incorporated into an adiabatic air parcel model with detailed sectional mi...