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首页> 外文期刊>Environmental Science & Technology >Evaporation Kinetics of Laboratory-Generated Secondary Organic Aerosols at Elevated Relative Humidity
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Evaporation Kinetics of Laboratory-Generated Secondary Organic Aerosols at Elevated Relative Humidity

机译：相对湿度升高时实验室产生的二次有机气溶胶的蒸发动力学

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摘要

Secondary organic aerosols (SOA) dominate atmospheric organic aerosols that affect climate, air quality, and health. Recent studies indicate that, contrary to previously held assumptions, at low relative humidity (RH) these particles are semisolid and evaporate orders of magnitude slower than expected. Elevated relative humidity has the potential to affect significantly formation, properties, and atmospheric evolution of SOA particles. Here we present a study of the effect of RH on the room-temperature evaporation kinetics of SOA particles formed by ozonolysis of α-pinene and limonene. Experiments were carried out on α-pinene SOA particles generated, evaporated, and aged at ＜5%, 50 and 90% RH, and on limonene SOA particles at ＜5% and 90% RH. We find that in all cases evaporation begins with a relatively fast phase, during which 30-70% of the particle mass evaporates in 2 h, followed by a much slower evaporation rate. Evaporation kinetics at ＜5% and 50% RH are nearly the same, while at 90% RH a slightly larger fraction evaporates. In all cases, aging the particles prior to inducing evaporation reduces the evaporative losses; with aging at elevated RH leading to a more significant effect In all cases, the observed SOA evaporation is nearly size-independent.
机译：二次有机气溶胶（SOA）在影响气候，空气质量和健康的大气有机气溶胶中占主导地位。最新研究表明，与以前的假设相反，在较低的相对湿度（RH）下，这些颗粒为半固体，且蒸发速度比预期的慢几个数量级。相对湿度升高可能会显着影响SOA颗粒的形成，性质和大气演变。在这里，我们对RH对由α-pine烯和柠檬烯进行臭氧分解形成的SOA颗粒的室温蒸发动力学进行了研究。在＜5％，50和90％相对湿度下生成，蒸发和老化的α-pine烯SOA颗粒以及在＜5％和90％RH下的柠檬烯SOA颗粒上进行了实验。我们发现，在所有情况下，蒸发都始于一个相对较快的阶段，在此阶段2小时内30-70％的颗粒质量蒸发，随后蒸发速率大大降低。相对湿度<5％和50％时，蒸发动力学几乎相同，而相对湿度90％时，蒸发动力学略大。在所有情况下，在引起蒸发之前老化颗粒都会减少蒸发损失。在较高的RH下老化会导致更显着的效果在所有情况下，观察到的SOA蒸发几乎与尺寸无关。

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  • 来源
    《Environmental Science & Technology》 |2015年第1期|243-249|共7页
  • 作者

    Jacqueline Wilson; Dan Imre; Josef Beranek; Manish Shrivastava; Alla Zelenyuk;

  • 作者单位

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Imre Consulting, Richland, Washington 993S2, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, United States;

    Pacific Northwest National Laboratory, Richland, Washington 99354, 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);
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  • 正文语种 eng
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