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首页> 外文期刊>Atmospheric environment >Ultrafine nitrate particle events in Baltimore observed by real-time single particle mass spectrometry
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Ultrafine nitrate particle events in Baltimore observed by real-time single particle mass spectrometry

机译：实时单颗粒质谱法观察巴尔的摩的超细硝酸盐颗粒事件

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摘要

Ambient particles in Baltimore, Maryland were characterized from April through November 2002 using the real-time single particle mass spectrometer, RSMS III. When particles containing nitrate were examined, two types of ultrafine particle events were revealed: a large burst of nominally "pure" nitrate particles in the 50-90 nm size range, and a smaller (and less frequent) burst of "pure" particles in the 50-90 nm size range that grew to 110-220 nm with time. Coincident with both of these events was an increase in the number of mixed composition particles containing nitrate, suggesting that they were formed by condensation of ammonium nitrate onto pre-existing particles. Meteorological variables, particle number concentrations and continuous nitrate mass measurements were compared to the single particle data. Number and mass concentrations estimated from RSMS III correlated well with similar measurements with other techniques. Ultrafine nitrate particle events were observed during periods of low temperature and high relative humidity as expected from ammonium nitrate equilibrium considerations. During these events, the partitioning of ammonium nitrate to the particle phase strongly influenced the particle number concentration as well as the chemical composition.
机译：2002年4月至2002年11月，使用实时单粒子质谱仪RSMS III对马里兰州巴尔的摩的环境粒子进行了表征。当检查含硝酸盐的颗粒时，发现了两种类型的超细颗粒事件：50-90 nm尺寸范围内的名义上“纯”硝酸盐颗粒的大爆发，以及在50-90 nm范围内较小（且频率较低）的“纯”颗粒的爆发。 50-90 nm的尺寸范围随时间增长到110-220 nm。与这两个事件同时发生的是含有硝酸盐的混合组合物颗粒的数量增加，这表明它们是由硝酸铵缩合到预先存在的颗粒上形成的。将气象变量，颗粒数浓度和连续的硝酸盐质量测量结果与单个颗粒数据进行了比较。通过RSMS III估算的数量和质量浓度与其他技术的类似测量结果具有很好的相关性。根据硝酸铵平衡的考虑，在低温和高相对湿度期间观察到超细硝酸盐颗粒事件。在这些事件中，硝酸铵在颗粒相中的分配强烈影响了颗粒数浓度以及化学组成。

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