Atmospheric Chemistry and Physics Hygroscopicity, Ccn and Volatility Properties of Submicron Atmospheric Aerosol in a Boreal Forest Environment during the Summer of 2010
Atmospheric Chemistry and Physics Hygroscopicity, Ccn and Volatility Properties of Submicron Atmospheric Aerosol in a Boreal Forest Environment during the Summer of 2010
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J. Hong;S. A. K. Häkkinen;M. Paramonov;M. Äijälä;J. Hakala;T. Nieminen;J. Mikkilä;N. Prisle;M. Kulmala;I. Riipinen;M. Bilde;V. Kerminen;T. Petäjä
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作者：
J. Hong;S. A. K. Häkkinen;M. Paramonov;M. Äijälä;J. Hakala;T. Nieminen;J. Mikkilä;N. Prisle;M. Kulmala;I. Riipinen;M. Bilde;V. Kerminen;T. Petäjä
2010 年夏季，采用挥发性吸湿串联差分迁移率分析仪 (VH-TDMA) 研究了芬兰海蒂亚拉北方森林环境中亚微米大气气溶胶颗粒的吸湿性和挥发性特性。对 Aitken 和累积模式内部混合颗粒（直径 50 nm、75 nm 和 110 nm）进行了研究。发现吸湿性随着颗粒尺寸的增加而增加。有机物和SO 2− 4 的相对质量分数可能是所有粒径吸湿性波动的主要贡献者。观测到云凝结核计数器 (CCNC) 导出的吸湿性参数 κ 略高于在亚饱和条件下根据 VH-TDMA 数据计算的 κ，对此行为的潜在原因将很快进行讨论。此外，还研究了颗粒的尺寸分辨挥发性特性。加热后，与大颗粒相比，更多的小颗粒蒸发。即使在 280 • C 的加热温度下，仍残留有大量的气溶胶体积（非挥发性物质）。通过尺寸分辨挥发性吸湿性分析，我们得出结论，在不同的加热温度下，即使在 280 • C 下，颗粒中始终残留有吸湿性物质。这表明观察到的非挥发性气溶胶材料不仅仅由黑碳组成。
A Volatility-Hygroscopicity Tandem Differential Mobility Analyzer (VH-TDMA) was applied to study the hygroscopicity and volatility properties of submicron atmospheric aerosol particles in a boreal forest environment in Hyytiälä, Finland during the summer of 2010. Aitken and accumulation mode internally mixed particles (50 nm, 75 nm and 110 nm in diameter) were investigated. Hygroscopic-ity was found to increase with particle size. The relative mass fraction of organics and SO 2− 4 is probably the major contributor to the fluctuation of the hygroscopicity for all particle sizes. The Cloud Condensation Nuclei Counter (CCNC)-derived hygroscopicity parameter κ was observed to be slightly higher than κ calculated from VH-TDMA data under sub-saturated conditions, potential reasons for this behavior are discussed shortly. Also, the size-resolved volatility properties of particles were investigated. Upon heating, more small particles evaporated compared to large particles. There was a significant amount of aerosol volume (non-volatile material) left, even at heating temperatures of 280 • C. Using size resolved volatility-hygroscopicity analysis, we concluded that there was always hygroscopic material remaining in the particles at different heating temperatures, even at 280 • C. This indicates that the observed non-volatile aerosol material did not consist solely of black carbon.