Contact freezing efficiency of mineral dust aerosols studied in an electrodynamic balance: quantitative size and temperature dependence for illite particles
Contact freezing efficiency of mineral dust aerosols studied in an electrodynamic balance: quantitative size and temperature dependence for illite particles
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DOI：
10.1039/c3fd00033h
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发表时间：
2013-01-01
影响因子：
3.4
通讯作者：
Leisner, Thomas
中科院分区：
文献类型：
--
作者：
Hoffmann, Nadine;Duft, Denis;Leisner, Thomas
长期以来，接触冻结一直被认为是在温度高于-25摄氏度时形成云冰的候选者，但直到现在，这一过程的分子机制仍然不清楚，关于各种气溶胶物质的大小和温度依赖的接触冻结特性的定量信息很少。在这方面的贡献，我们提出了第一个定量测量的冻结概率的过冷液滴后，一个单一的接触与大小选定的伊利石矿物颗粒。它被发现，这种概率是一个很强的函数的温度和气溶胶粒子的大小。对于研究的颗粒和分钟的时间尺度上的实验，接触冻结确实占主导地位的浸没冻结的所有温度。
Contact freezing has long been discussed as a candidate for cloud ice formation at temperatures warmer than about -25 degrees C, but until now the molecular mechanism underlying this process has remained obscure and little quantitative information about the size and temperature dependent contact freezing properties of the various aerosol species is available. In this contribution, we present the first quantitative measurements of the freezing probability of a supercooled droplet upon a single contact with a size selected illite mineral particle. It is found that this probability is a strong function of temperature and aerosol particle size. For the particles investigated and on the minute time scale of the experiment, contact freezing indeed dominates immersion freezing for all temperatures.