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Particulates

机译：微粒

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Chemical composition and hygroscopicity closure of marine aerosol in high time resolution has not been achieved yet due to the difficulty involved in measuring the refractory sea-salt concentration in near-real time. In this study, attempts were made to achieve closure for marine aerosol based on a humidified tandem differential mobility analyser (HTDMA) and a high-resolution time-of-flight aerosol mass spectrometer (AMS) for wintertime aerosol at Mace Head, Ireland. The aerosol hygroscopicity was examined as a growth factor (GF) at 90% relative humidity (RH). The corresponding GFs of 35, 50,75, 110 and 165 nm particles were 1:540:26, 1:600:29, 1:660:31, 1:720:29 and 1:780:30 (meanstandard deviation), respectively. Two contrasting air masses (continental and marine) were selected to study the temporal variation in hygroscopicity; the results demonstrated a clear diurnal pattern in continental air masses, whereas no diurnal pattern was found in marine air masses. In addition, wintertime aerosol was observed to be largely externally mixed in both of the contrasting air masses. Concurrent high time resolution PM1 (paniculate matter 1 um) chemical composition data from combined AMS and MAAP measurements, comprising organic matter, non-sea-salt sulfate, nitrate, ammonium, sea salt and black carbon (BC), were used to predict aerosol hygroscopicity with the Zdanovskii-Stokes-Robinson (ZSR) mixing rule. Overall, good agreement (an R2 value of 0.824 and a slope of 1.02) was found between the growth factor of 165 nm particles measured by the HTDMA (GFHTDMA) and the growth factor derived from the AMSCMAAP bulk chemical composition (GFAMS). Over 95% of the estimated GF values exhibited less than a 10%deviation for the whole dataset, and this deviation was mostly attributed to the neglected mixing state as a result of the bulk PM1 composition.
机译：由于难以在近实时测量难治性海盐浓度的难度，尚未实现海洋气溶胶的化学成分和吸湿性闭合。在这项研究中，基于加湿串联差动迁移率分析仪（HTDMA）以及用于在Mace Head，Ireland的冬季气溶胶的高分辨率时间气溶胶质谱仪（AMS）来实现对海洋气溶胶的封闭。将气溶胶吸湿性在90％相对湿度（RH）下被检查为生长因子（GF）。 35,50,75,110和165nm颗粒的相应GF为1：540：26,1：600：29,1：660：31,1：720：29和1：780：30（平均标准偏差），分别。选择了两个对比的空气肿块（欧式和海洋）以研究吸湿性的时间变化;结果表明，大陆风险中的阳性图案清晰，而海洋空气质量没有发现昼夜图案。此外，观察到冬季气溶胶在两个对比气体中大部分混合。并发高时间分辨率PM1（容量物质1MU）来自组合AMS和MAAP测量的化学成分数据，包括有机物质，非海盐硫酸盐，硝酸盐，铵，海盐和黑碳（BC），用于预测气溶胶与Zdanovskii-Stokes-Robinson（ZSR）混合规则的湿润程度。总体而言，在由HTDMA（GFHTDMA）测量的165nm颗粒的生长因子和源自Amscmaap散装化学成分（GFAM）的生长因子之间的生长因子与源自AmSCMAAP散装化学组合物（GFAM）的生长因子之间存在良好的一致性（R2值为0.824和1.02的斜率）。超过95％的估计的GF值表现出整个数据集的偏差小于10％，并且该偏差主要归因于散装PM1组合物的忽略的混合状态。

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    《Oceanographic Literature Review》 |2020年第4期|965-968|共4页
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