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首页> 外文期刊>Environmental Science & Technology >Heterogeneous Ice Nucleation on Simulated Secondary Organic Aerosol
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Heterogeneous Ice Nucleation on Simulated Secondary Organic Aerosol

机译：模拟次级有机气溶胶的非均质冰核化

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摘要

In this study, we have explored the phase behavior and the ice nucleation properties of secondary organic aerosol made from aqueous processing (aqSOA). AqSOA was made from the dark reactions of methylglyoxal with methyl- amine in simulated evaporated cloud droplets. The resulting particles were probed from 215 to 250 K using Raman spectroscopy coupled to an environmental cell. We find these particles are in a semisolid or glassy state based upon their behavior when exposed to mechanical pressure as well as their flow behavior. Further, we find that these aqSOA particles are poor depositional ice nuclei, in contrast to previous studies on simple mixtures of glassy organics. Additionally, we have studied the effect of ammonium sulfate on the phase, morphology, and ice nucleation behavior of the aqSOA. We find that the plasticizing effect of ammonium sulfate lowers the viscosity of the aqSOA, allowing the ammonium sulfate to effloresce within the aqSOA matrix. Upon humidification, the aqSOA matrix liquefies before it can depositionally nucleate ice, and the effloresced ammonium sulfate can act as an immersion mode ice nucleus. This change in the mode of nucleation is accompanied by an increase in the overall ice nucleation efficiency of the aqSOA particles.
机译：在这项研究中，我们探索了由水处理（aqSOA）制成的二次有机气溶胶的相行为和冰成核特性。 AqSOA由甲基乙二醛与甲胺在模拟的蒸发云滴中的暗反应制得。使用与环境电池耦合的拉曼光谱在215至250 K范围内探测所得颗粒。基于它们在机械压力下的行为及其流动行为，我们发现它们处于半固态或玻璃态。此外，我们发现这些aqSOA颗粒的沉积冰核较差，这与先前对玻璃状有机物简单混合物的研究形成了鲜明对比。此外，我们研究了硫酸铵对aqSOA的相，形态和冰成核行为的影响。我们发现，硫酸铵的增塑作用降低了aqSOA的粘度，从而使硫酸铵在aqSOA基质中泛化。加湿后，aqSOA基质先液化，然后才能使冰沉积成核，而风化硫酸铵可以充当浸没模式的冰核。成核模式的这种变化伴随着aqSOA颗粒的总体冰成核效率的提高。

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  • 来源
    《Environmental Science & Technology》 |2014年第3期|1675-1682|共8页
  • 作者

    Gregory P. Schill; David O. De Haan; Margaret A. Tolbert;

  • 作者单位

    Cooperative Institute for Research in Environmental Sciences and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States;

    Department of Chemistry and Biochemistry, University of San Diego, San Diego, California 92110, United States;

    Cooperative Institute for Research in Environmental Sciences and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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