Secondary ice production during the break-up of freezing water drops on impact with ice particles
Secondary ice production during the break-up of freezing water drops on impact with ice particles
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DOI：
10.5194/acp-2021-557
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发表时间：
2021-07
影响因子：
6.3
通讯作者：
R. James;V. Phillips;P. Connolly
中科院分区：
文献类型：
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作者：
R. James;V. Phillips;P. Connolly
抽象。我们在实验中研究了过冷水滴（直径为1.5 mm）与放置在载玻片上的相似大小的冰粒在温度T ≥ −12 °C时的碰撞。我们的研究结果表明，二次液滴的扩展和收缩阶段的过冷水滴的影响。在扩散阶段产生的二次液滴喷射得太快而无法量化。然而，在收缩阶段产生的直径> 0.1 mm的二次液滴的定量显示，每次碰撞形成5-10个二次液滴，其中约30%的二次液滴在−4 °C ≤ T ≤ −12 °C的温度范围内冻结。我们的调查提供了第一个专门的实验室研究过冷水滴与冰粒的碰撞作为二次制冰机制。我们的研究结果表明，这种二次冰的生产机制可能是显着的冰形成在大气云含有大的过冷液滴和冰粒。
Abstract. We experimentally investigated collisions of supercooled water drops (∼ 5 mm in diameter) with ice particles of a similar size placed on a glass slide at temperatures T ≥ −12 °C. Our results showed that secondary drops were generated during both the spreading and retraction phase of the supercooled water drop impact. The secondary drops generated during the spreading phase were emitted too fast to quantify. However, quantification of the secondary drops generated during the retraction phase with diameters > 0.1 mm showed that 5–10 secondary drops formed per collision, with approximately 30 % of the secondary drops freezing over a temperature range of −4 °C ≤ T ≤ −12 °C. Our investigation provides the first dedicated laboratory study of collisions of supercooled water drops with ice particles as a secondary ice production mechanism. Our results suggest that this secondary ice production mechanism may be significant for ice formation in atmospheric clouds containing large supercooled drops and ice particles.