Using particle-resolved aerosol model simulations to guide the interpretations of cloud condensation nuclei experimental data
Using particle-resolved aerosol model simulations to guide the interpretations of cloud condensation nuclei experimental data
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DOI：
10.1080/02786826.2023.2202741
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发表时间：
2023-04
影响因子：
5.2
通讯作者：
Patricia N. Razafindrambinina;K. Malek;Anomitra De;Kanishk Gohil;N. Riemer;A. Asa-Awuku
中科院分区：
文献类型：
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作者：
Patricia N. Razafindrambinina;K. Malek;Anomitra De;Kanishk Gohil;N. Riemer;A. Asa-Awuku
摘要大气气溶胶颗粒物在与来自其他气团和排放源的颗粒物凝结时会经历动态混合过程。因此，气溶胶存在于一个光谱中，从外部混合到内部混合。气溶胶的混合状态会影响其吸水能力（吸湿性）和云凝结核（CCN）活动，从而改变其对地球总辐射收支的贡献。然而，目前的吸水测量方法可能无法捕捉复杂的混合状态。本研究利用粒子解析气溶胶模式PartMC模拟动态混合过程，并在层流混合管中进行实验。观察到硫酸铵和蔗糖二元混合物的混合演化沿着其吸水特性的变化，其吸水特性表示为单一吸湿参数κ。混合模拟与实验相结合的使用允许更好地识别颗粒混合状态和颗粒吸水率，并表明没有一个kappa值可以捕获整个混合颗粒尺寸分布的混合的复杂性。换句话说，PartMC模拟可以作为一个指导工具来解释一个系统的混合状态的基础上，其实验液滴激活光谱。这项工作表明了混合模型的集成和使用的重要性，以帮助混合状态的测定和吸湿性测量的混合系统。版权所有© 2023美国气溶胶研究协会图形摘要
Abstract Ambient aerosol particles can undergo dynamic mixing processes as they coagulate with particles from other air masses and emission sources. Therefore, aerosols exist in a spectrum, from externally mixed to internally mixed. The mixing state of aerosols can affect their ability to uptake water (hygroscopicity) and their cloud condensation nuclei (CCN) activity, modifying their contribution to the planet’s total radiative budget. However, current water-uptake measurement methods may not be able to capture the complex mixing state. In this research, the dynamic mixing process was simulated by the particle-resolved aerosol model PartMC and also created by experiments in a laminar flow mixing tube. The mixing evolution of ammonium sulfate and sucrose binary mixtures were observed along with the changes in their water uptake properties expressed as the single hygroscopicity parameter, κ. The use of a mixing simulation in conjunction with experiments allow for better identification of the particle mixing state and the particle water uptake and show that no one kappa value can capture the complexity of mixing across the mixed particle size distribution. In other words, the PartMC simulations can be used as a guiding tool to interpret a system’s mixing state based on its experimental droplet activation spectra. This work demonstrates the importance of the integration and use of mixing models to aid in mixing state determination and hygroscopicity measurements of mixed systems. Copyright © 2023 American Association for Aerosol Research Graphical abstract