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Integration of size distributions and size-resolved hygroscopicity measured during the Houston Supersite for compositional categorization of the aerosol

机译：在休斯顿超级站点期间对气溶胶的成分分类进行测量的尺寸分布和尺寸分辨的吸湿性的积分

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Measurements of aerosol size distributions and hygroscopicity were combined to infer the size-resolved composition of the ambient aerosol during the Houston Supersite campaign from June through October, 2001. The 3000 + distributions used in this analysis were measured at the Aldine site north and typically downwind of the greater Houston metropolitan area. Size distributions spanning the diameter range from 0.025 to 0.700 μm, and hygroscopic behavior at eight logarithmically spaced dry diameters from 0.025 to 0.344 μm were analyzed. At smaller dry sizes, the aerosol hygroscopic growth factor distributions were typically monomodal and peaked at or near a growth factor of 1.0, indicating predominantly non-hygroscopic aerosols. Particles larger than ～0.100 μm exhibited bimodal growth patterns, with increasing importance of the hygroscopic mode with increasing dry particle size. Hygroscopic growth distributions were used to partition the aerosol into pure insoluble, mixed insoluble, mixed soluble, and pure soluble categories. This categorization scheme was used to analyze in detail four multi-day episodes. During two of these episodes new particle formation events were observed daily. The recently formed particles were only sparingly hygroscopic, suggesting they were composed primarily of insoluble material. To contrast these periods during which pronounced diurnal variability was observed, a third period was chosen because the aerosol concentration and composition varied little. The fourth period analyzed spanned the passage of a cold front, which had a pronounced influence on the aerosol distributions.
机译：在2001年6月至2001年10月的休斯敦超级站点活动期间，结合了气溶胶尺寸分布和吸湿性的测量值，推断出环境气溶胶的尺寸分辨成分。在此分析中使用的3000+分布是在Aldine站点北部（通常为顺风）测量的大休斯顿都会区。分析了直径范围为0.025至0.700μm的尺寸分布，并分析了八个对数间隔的干燥直径为0.025至0.344μm的吸湿性能。在较小的干燥尺寸下，气溶胶吸湿性生长因子分布通常是单峰的，并且在1.0或接近1.0的生长因子时达到峰值，表明主要是非吸湿性气溶胶。大于〜0.100μm的颗粒表现出双峰增长模式，随着干颗粒尺寸的增加，吸湿模式的重要性也随之增加。使用吸湿性生长分布将气雾剂分为纯不溶，混合不溶，混合可溶和纯可溶类别。该分类方案用于详细分析四个多天情节。在这些事件的两次中，每天观察到新的颗粒形成事件。新近形成的颗粒几乎没有吸湿性，表明它们主要由不溶物组成。为了对比观察到明显的昼夜变化的这些时期，选择了第三个时期，因为气溶胶浓度和组成变化很小。第四阶段的分析跨越了冷锋的通过，这对气溶胶的分布有明显的影响。

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