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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >LABORATORY STUDIES OF TERNARY H2SO4/HNO3/H2O PARTICLES - IMPLICATIONS FOR POLAR STRATOSPHERIC CLOUD FORMATION
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LABORATORY STUDIES OF TERNARY H2SO4/HNO3/H2O PARTICLES - IMPLICATIONS FOR POLAR STRATOSPHERIC CLOUD FORMATION

机译：三元H2SO4 / HNO3 / H2O颗粒的实验室研究-极性平流层云团形成的意义

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It has recently been suggested that type Ib polar stratospheric clouds are composed of supercooled ternary-solutions of sulfuric acid (H2SO4), nitric acid (HNO3), and water (H2O). We have studied the low-temperature behavior of ternary-solution aerosols to determine if they will undergo homogeneous freezing nucleation under polar stratospheric conditions. Ternary-solution aerosols were injected into a low-temperature chamber and observed for periods of up to 3 hours. Fourier transform infrared spectroscopy was used to determine the aerosol composition and phase as a function of time. We found that ternary-solution aerosols with compositions similar to those expected in the polar stratosphere remained supercooled for the duration of our experiments. Homogeneous freezing of the particles was never observed, even after warming from 190 to 204 K. However, heterogeneous freezing was occasionally observed for particles adhering to the infrared optics within the chamber. [References: 26]
机译：最近有人提出，Ib型极地平流层云由硫酸（H2SO4），硝酸（HNO3）和水（H2O）的过冷三元溶液组成。我们研究了三元溶液气溶胶的低温行为，以确定它们在极平流层条件下是否会经历均匀的冷冻成核。将三元溶液气雾剂注入低温室，并观察长达3小时的时间。使用傅立叶变换红外光谱法确定气溶胶成分和相随时间的变化。我们发现在我们的实验过程中，三元溶液气溶胶的成分与极地平流层中预期的成分相似，仍保持过冷状态。即使从190 K加热到204 K，也从未观察到颗粒的均质冻结。但是，偶尔会观察到粘附在室内红外光学元件上的颗粒发生异质冻结。 [参考：26]

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