Temperature effects on sulfuric acid aerosol nucleation and growth: initial results from the TANGENT study
Temperature effects on sulfuric acid aerosol nucleation and growth: initial results from the TANGENT study
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DOI：
10.5194/acp-19-8915-2019
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发表时间：
2019-07
影响因子：
6.3
通讯作者：
L. Tiszenkel;C. Stangl;J. Krasnomowitz;Q. Ouyang;Huan Yu;Michael J. Apsokardu;M. Johnston;Shan‐Hu Lee
中科院分区：
文献类型：
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作者：
L. Tiszenkel;C. Stangl;J. Krasnomowitz;Q. Ouyang;Huan Yu;Michael J. Apsokardu;M. Johnston;Shan‐Hu Lee
抽象。新粒子形成（NPF）包括两个步骤：成核和随后的生长。目前，控制这两个过程的化学和物理机制还不清楚。在这里，我们报告的TANGENT（串联气溶胶成核和生长环境管）实验获得的初步结果。TANGENT仪器使我们能够独立地研究这两个过程。本研究的重点是温度对硫酸成核和进一步生长的影响。我们的研究结果表明，较低的温度提高成核和生长速率。然而，在低于268 K的温度下，温度对成核速率的影响变得不那么显著，并且成核速率变得不那么依赖于相对湿度，这表明在我们的流管条件下的颗粒形成在较低温度下通过无障碍成核发生。我们还研究了新形成的颗粒在不同温度条件下的成核和进一步生长。我们的研究结果表明，在低温下形成的新成核簇确实可以在SO2和臭氧以及潜在的其他污染物蒸气存在下在更温暖的环境中蒸发和生长。这些结果表明，一些涉及纳米粒子的非均相反应影响新形成的颗粒的成核和生长。
Abstract. New particle formation (NPF) consists of two steps: nucleation and subsequent growth. At present, chemical and physical mechanisms that govern these two processes are not well understood. Here, we report initial results obtained from the TANGENT (Tandem Aerosol Nucleation and Growth Environment Tube) experiments. The TANGENT apparatus enables us to study these two processes independently. The present study focuses on the effects of temperature on sulfuric acid nucleation and further growth. Our results show that lower temperatures enhance both the nucleation and growth rate. However, under temperatures below 268 K the effects of temperature on the nucleation rate become less significant and the nucleation rate becomes less dependent on relative humidity, indicating that particle formation in the conditions of our flow tube takes place via barrierless nucleation at lower temperatures. We also examined the growth of newly formed particles under differing temperature conditions for nucleation and further growth. Our results show that newly nucleated clusters formed at low temperatures can indeed survive evaporation and grow in a warmer environment in the presence of SO2 and ozone and potentially other contaminant vapors. These results imply that some heterogeneous reactions involving nanoparticles affect nucleation and growth of newly formed particles.