Measurements of Depositional Ice Nucleation on Insoluble Substrates at Low Temperatures: Implications for Earth and Mars†
Measurements of Depositional Ice Nucleation on Insoluble Substrates at Low Temperatures: Implications for Earth and Mars†
复制标题
低温下不溶性基质上沉积冰核的测量：对地球和火星的影响†
DOI：
10.1021/jp805140p
复制
发表时间：
2009
影响因子：
3.7
通讯作者：
M. Tolbert
中科院分区：
文献类型：
--
作者：
M. Trainer;O. B. Toon;M. Tolbert
冰粒的非均质沉积成核可能在具有非常低的温度的大气区域中占主导地位，在该区域中，预计会有低蒸气压和不溶性核。然而，在低于200 K的温度下没有广泛研究沉积冰成核，在低于170 K的温度下根本没有研究。在这里，我们展示了在150至180 K的温度下，冰在固体硅衬底上的非均相沉积成核的研究结果。本文给出的结果表明了一个意想不到的温度依赖性，其中在T ≤ 180 K时，需要非常高的临界过饱和度才能成核。低于175 K的成核所需的蒸汽压大于过冷液态水的蒸汽饱和度。当假设接触参数m与温度无关时，所观察到的温度依赖性不是由经典的异质成核理论预测的。在这里，我们使用我们的新测量与以前公布的数据相结合，以获得一个温度依赖的…
Heterogeneous depositional nucleation of ice particles may dominate in atmospheric regions with very low temperatures, where low vapor pressures and insoluble nuclei would be expected. However, depositional ice nucleation has not been studied extensively at temperatures below 200 K and not at all below 170 K. Here, we show results of a study of heterogeneous depositional nucleation of ice on a solid silicon substrate at temperatures from 150 to 180 K. The results presented herein demonstrate an unexpected temperature dependence in which very high critical supersaturations are required to nucleate ice at T ≤ 180 K. The vapor pressures necessary for nucleation below 175 K are greater than the vapor saturation for supercooled liquid water. The temperature dependence observed is not predicted by classical heterogeneous nucleation theory, when assuming a temperature-independent contact parameter, m. Here, we use our new measurements in combination with previously published data to derive a temperature-dependen...