Effects of mixing state on water-uptake properties of ammonium sulfate – Organic mixtures
Effects of mixing state on water-uptake properties of ammonium sulfate – Organic mixtures
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DOI：
10.1080/02786826.2022.2114313
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发表时间：
2022-08
影响因子：
5.2
通讯作者：
Patricia N. Razafindrambinina;K. Malek;Kristine DiMonte;J. Dawson;T. Raymond;D. Dutcher;M. Freedman;A. Asa-Awuku
中科院分区：
文献类型：
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作者：
Patricia N. Razafindrambinina;K. Malek;Kristine DiMonte;J. Dawson;T. Raymond;D. Dutcher;M. Freedman;A. Asa-Awuku
摘要大气中的气溶胶粒子具有吸水和形成液滴的能力。形成的水滴可以与太阳辐射相互作用（气溶胶的间接效应），并影响净辐射强迫。然而，由于气溶胶的间接影响，辐射强迫的变化幅度仍然是不确定的，因为气溶胶的组成和混合状态，在空间和时间上的高度变化。因此，需要在受控条件下测量不同气溶胶颗粒群的吸水率，以深入了解复杂环境系统的吸水率。在这项工作中，通过三种方法直接测量内部和外部混合的硫酸铵-有机二元混合物的吸水率（吸湿性），并与液滴生长预测模型进行比较。我们发现，亚饱和水吸收的硫酸铵有机混合物同意其过饱和吸湿性，混合状态的信息是能够检索在两个湿度制度。此外，我们发现，溶解度调整的模型可能无法捕获的粘性颗粒的水吸收，和可溶性有机气溶胶颗粒，散装溶解度可能无法与它们在液滴中的溶解度。这项工作突出了使用多个互补的吸水测量仪器，以获得更清晰的混合气溶胶颗粒吸湿性的重要性，特别是对于日益复杂的系统。版权所有© 2022美国气溶胶研究协会图形摘要概要声明这项工作提供了对大气中普遍存在的混合气溶胶颗粒的吸水测量，这对改进气候模型很有用。
Abstract Aerosol particles in the atmosphere have the ability to uptake water and form droplets. The droplets formed can interact with solar radiation (indirect effect of aerosols) and influence the net radiative forcing. However, the magnitude of change in radiative forcing due to the indirect effect of aerosols remains uncertain due to the high variance in aerosol composition and mixing states, both spatial and temporally. As such, there is a need to measure the water-uptake of different aerosol particle groups under controlled conditions to gain insight into the water-uptake of complex ambient systems. In this work, the water-uptake (hygroscopicity) of internally and externally mixed ammonium sulfate – organic binary mixtures were directly measured via three methods and compared to droplet growth prediction models. We found that subsaturated water-uptake of ammonium sulfate-organic mixtures agreed with their supersaturated hygroscopicities, and mixing state information was able to be retrieved at both humidity regimes. In addition, we found that solubility-adjusted models may not be able to capture the water-uptake of viscous particles, and for soluble organic aerosol particles, bulk solubility may not be comparable to their solubility in a droplet. This work highlights the importance of using multiple complementary water-uptake measurement instruments to get a clearer picture of mixed aerosol particle hygroscopicity, especially for increasingly complex systems. Copyright © 2022 American Association for Aerosol Research Graphical Abstract SYNOPSIS STATEMENT This work provides water-uptake measurements of mixed aerosol particles that are prevalent in the atmosphere that can be useful in improving climate models.