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Atmospheric aging enhances the ice nucleation ability of biomass-burning aerosol
Science Advances ( IF 13.6 ) Pub Date : 2021-02-24 , DOI: 10.1126/sciadv.abd3440
Lydia G. Jahl 1 , Thomas A. Brubaker 1 , Michael J. Polen 1 , Leif G. Jahn 1 , Kerrigan P. Cain 1 , Bailey B. Bowers 1 , William D. Fahy 1 , Sara Graves 1 , Ryan C. Sullivan 1
Affiliation  

Ice-nucleating particles (INPs) in biomass-burning aerosol (BBA) that affect cloud glaciation, microphysics, precipitation, and radiative forcing were recently found to be driven by the production of mineral phases. BBA experiences extensive chemical aging as the smoke plume dilutes, and we explored how this alters the ice activity of the smoke using simulated atmospheric aging of authentic BBA in a chamber reactor. Unexpectedly, atmospheric aging enhanced the ice activity for most types of fuels and aging schemes. The removal of organic carbon particle coatings that conceal the mineral-based ice-active sites by evaporation or oxidation then dissolution can increase the ice activity by greater than an order of magnitude. This represents a different framework for the evolution of INPs from biomass burning where BBA becomes more ice active as it dilutes and ages, making a larger contribution to the INP budget, resulting cloud microphysics, and climate forcing than is currently considered.



中文翻译:

大气老化增强了燃烧生物质气溶胶的冰核能力

最近发现,影响生物云燃烧,微物理学,降水和辐射强迫的生物质燃烧气溶胶(BBA)中的冰核颗粒(INPs)是由矿物相的产生驱动的。随着烟羽的稀释,BBA经历了广泛的化学老化,我们探索了如何使用室内反应器中真实的BBA的模拟大气老化来改变烟雾的冰活动。出乎意料的是,大气老化会提高大多数类型燃料和老化方案的冰活动。通过蒸发或氧化去除溶解而隐藏了矿物基冰活性位点的有机碳颗粒涂层,可以将冰活性提高一个数量级以上。

更新日期:2021-02-25
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