4.7 Article

The rate of equilibration of viscous aerosol particles

期刊

ATMOSPHERIC CHEMISTRY AND PHYSICS
卷 16, 期 8, 页码 5299-5313

出版社

COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-16-5299-2016

关键词

-

资金

  1. Natural Environment Research Council [NE/K500859/1, NE/J02175X/1]
  2. Natural Environment Research Council [1231603, NE/M003531/1] Funding Source: researchfish
  3. NERC [NE/M003531/1, NE/J02175X/1] Funding Source: UKRI

向作者/读者索取更多资源

The proximity of atmospheric aerosol particles to equilibrium with their surrounding condensable vapours can substantially impact their transformations, fate and impacts and is the subject of vibrant research activity. In this study we first compare equilibration timescales estimated by three different models for diffusion through aerosol particles to assess any sensitivity to choice of model framework. Equilibration times for diffusion coefficients with varying dependencies on composition are compared for the first time. We show that even under large changes in the saturation ratio of a semi-volatile component (e(s)) of 1-90aEuro-% predicted equilibration timescales are in agreement, including when diffusion coefficients vary with composition. For condensing water and a diffusion coefficient dependent on composition, a plasticising effect is observed, leading to a decreased estimated equilibration time with increasing final e(s). Above 60aEuro-% final e(s) maximum equilibration times of around 1aEuro-s are estimated for comparatively large particles (10aEuro-A mu m) containing a relatively low diffusivity component (1aEuro- x aEuro-10(-25)aEuro-m(2)aEuro-s(-1) in pure form). This, as well as other results here, questions whether particle-phase diffusion through water-soluble particles can limit hygroscopic growth in the ambient atmosphere. In the second part of this study, we explore sensitivities associated with the use of particle radius measurements to infer diffusion coefficient dependencies on composition using a diffusion model. Given quantified similarities between models used in this study, our results confirm considerations that must be taken into account when designing such experiments. Although quantitative agreement of equilibration timescales between models is found, further work is necessary to determine their suitability for assessing atmospheric impacts, such as their inclusion in polydisperse aerosol simulations.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据