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Reconciling atmospheric water uptake by hydrate forming salts.
Environmental Science: Processes & Impacts ( IF 4.3 ) Pub Date : 2020-07-14 , DOI: 10.1039/d0em00179a
Bernadette Rosati 1 , Andreas Paul , Emil Mark Iversen , Andreas Massling , Merete Bilde
Affiliation  

Magnesium and calcium chloride salts contribute to the global atmospheric aerosol burden via emission of sea spray and mineral dust. Their influence on aerosol hygroscopicity and cloud forming potential is important but uncertain with ambiguities between results reported in the literature. To address this, we have conducted measurements of the hygroscopic growth and critical supersaturation of dried, size selected nano-particles made from aqueous solution droplets of MgCl2 and CaCl2, respectively, and compare experimentally derived values with results from state-of-the-art thermodynamic modelling. It is characteristic of both MgCl2 and CaCl2 salts that they bind water in the form of hydrates under a range of ambient conditions. We discuss how hydrate formation affects the particles' water uptake and provide an expression for hydrate correction factors needed in calculations of hygroscopic growth factors, critical super-saturations, and derived κ values of particles containing hydrate forming salts. We demonstrate the importance of accounting for hydrate forming salts when predicting hygroscopic properties of sea spray aerosol.

中文翻译:

通过水合物形成盐调节大气中的水分吸收。

镁盐和氯化钙盐通过排放海浪和矿物粉尘而加剧了全球大气气溶胶负担。它们对气溶胶吸湿性和云形成潜力的影响很重要,但不确定,文献报道的结果之间存在歧义。为了解决这个问题,我们对分别由MgCl 2和CaCl 2的水溶液液滴制成的干燥的,选定尺寸的纳米颗粒进行了吸湿性生长和临界过饱和度的测量,并将实验得出的值与状态的结果进行了比较。先进的热力学建模。它同时具有MgCl 2和CaCl 2的特性在一定范围的环境条件下,它们以水合物形式结合水的盐。我们讨论了水合物的形成如何影响颗粒的吸水率,并提供了计算吸湿性生长因子,临界过饱和度以及包含水合物形成盐的颗粒的κ值的计算所需的水合物校正因子的表达式。我们证明了预测海喷雾气溶胶的吸湿性时考虑水合物形成盐的重要性。
更新日期:2020-08-19
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