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首页> 外文期刊>Atmospheric chemistry and physics >Relating the hygroscopic properties of submicron aerosol to both gas- and particle-phase chemical composition in a boreal forest environment
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Relating the hygroscopic properties of submicron aerosol to both gas- and particle-phase chemical composition in a boreal forest environment

机译：在北方森林环境中将亚微米气溶胶的吸湿特性与气相和颗粒相化学成分相关联

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Measurements of the hygroscopicity of 15–145 nm particles in a boreal forestenvironment were conducted using two Hygroscopicity Tandem Differential Mobility Analyzer (HTDMA) systems during the Pan-EuropeanGas-Aerosols-climate interaction Study (PEGASOS) campaign in spring 2013.Measurements of the chemical composition of non-size segregated particleswere also performed using a high-resolution aerosol mass spectrometer (HR-AMS) in parallel with hygroscopicity measurements. On average, thehygroscopic growth factor (HGF) of particles was observed to increase fromthe morning until afternoon. In case of accumulation mode particles, themain reasons for this behavior were increases in the ratio of sulfate toorganic matter and oxidation level (O : C ratio) of the organic matter in theparticle phase. Using an O : C dependent hygroscopic growth factor of organicmatter (HGForg), fitted using the inverse Zdanovskii–Stokes–Robinson(ZSR) mixing rule, clearly improved the agreement between measured HGF andthat predicted based on HR-AMS composition data. Besides organic oxidationlevel, the influence of inorganic species was tested when using the ZSRmixing rule to estimate the hygroscopic growth factor of organics in theaerosols. While accumulation and Aitken mode particles were predicted fairlywell by the bulk aerosol composition data, the hygroscopicity of nucleationmode particles showed little correlation. However, we observed them to bemore sensitive to the gas phase concentration of condensable vapors: themore sulfuric acid in the gas phase, the more hygroscopic thenucleation mode particles were. No clear dependence was found between theextremely low-volatility organics concentration (ELVOC) and the HGF ofparticles of any size.
机译：在2013年春季的泛欧洲天然气-气溶胶-气候相互作用研究（PEGASOS）活动中，使用两个吸湿性串联微分淌度分析仪（HTDMA）系统对北方森林环境中15-145 nm颗粒的吸湿性进行了测量。还使用高分辨率气溶胶质谱仪（HR-AMS）与吸湿性测量同时进行了非尺寸分离颗粒的合成。平均而言，观察到颗粒的吸湿生长因子（HGF）从早上到下午增加。对于聚集模式的颗粒，这种行为的主要原因是颗粒相中有机物的硫酸盐比和有机物的氧化度（O：C比）增加。使用O，C依赖的有机物吸湿性生长因子（HGF org ），并使用Zdanovskii–Stokes–Robinson（ZSR）逆混合规则拟合，可以明显改善HGF的测量值与基于HR预测的结果之间的一致性-AMS组成数据。除有机氧化水平外，当使用ZSRmixing规则估算气溶胶中有机物的吸湿生长因子时，还测试了无机物质的影响。虽然通过大量气溶胶成分数据可以很好地预测堆积和Aitken模式颗粒，但成核模式颗粒的吸湿性几乎没有相关性。但是，我们观察到它们对可冷凝蒸气的气相浓度更敏感：气相中的硫酸越多，吸湿性成核模式颗粒越多。在极低挥发性有机物浓度（ELVOC）和任何大小的颗粒的HGF之间均未发现明显的依赖性。

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