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首页> 外文期刊>Atmospheric chemistry and physics >Results of the first air ion spectrometer calibration and intercomparison workshop
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Results of the first air ion spectrometer calibration and intercomparison workshop

机译：首次空气离子光谱仪校准和比对讲习班的结果

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The Air Ion Spectrometer (AIS) measures mobility and size distributions ofatmospheric ions. The Neutral cluster and Air Ion Spectrometer (NAIS) canadditionally measure neutral particles. The number of the (N)AIS instrumentsin the world is only 11. Nevertheless, they are already widely used inatmospheric ion studies, particularly related to the initial steps of newparticle formation. There is no standard method applicable for calibratingthe ion spectrometers in the sub-3 nm ion range. However, recent developmentof high resolution DMAs has enabled the size separation of small ions withgood mobility resolution. For the first time, the ion spectrometers wereintercompared and calibrated in a workshop, held in January–February 2008 inHelsinki, Finland. The overall goal was to experimentally determine the(N)AIS transfer functions. Monomobile mobility standards, 241-Am charger ionsand silver particles were generated and used as calibration aerosols. Highresolution DMAs were used to size-separate the smaller (1–10 nm) ions,while at bigger diameters (4–40 nm) the size was selected with a HAUKE-typeDMA. Negative ion mobilities were detected by (N)AISs with slightly betteraccuracy than positive, nonetheless, both were somewhat overestimated. Alinear fit of slope of one to the whole dataset of mobilities suggested that(N)AISs measured the negative mobilities 1.36±0.16 times larger comparedwith the reference instruments. Similarly, positive mobilities were measured1.39±0.15 times larger compared with the reference instruments. Thecompletely monomobile mobility standards were measured with the bestaccuracy. The (N)AIS concentrations were compared with an aerosolelectrometer (AE) and a condensation particle counter (CPC). At sizes below1.5 nm (positive) and 3 nm (negative) the ion spectrometers detected higherconcentrations while at bigger sizes they showed similar concentrations asthe reference instruments. The total particle concentrations measured by theNAISs were within ±50% of the reference CPC concentration at 4–40 nmsizes. The lowest cut-off size of the NAIS in neutral particle measurementswas determined to be between 1.5 and 3 nm, depending on the measurementconditions and the polarity.
机译：空气离子光谱仪（AIS）用于测量大气离子的迁移率和尺寸分布。中性星团和空气离子光谱仪（NAIS）可以另外测量中性粒子。世界上（N）AIS仪器的数量仅为11个。尽管如此，它们已被广泛用于大气离子研究中，特别是与新粒子形成的初始步骤有关。没有标准方法可用于校准亚3 nm离子范围内的离子光谱仪。但是，高分辨率DMA的最新发展已实现了具有良好迁移率分辨率的小离子的尺寸分离。首次在2008年1月至2月在芬兰赫尔辛基举行的研讨会上对离子光谱仪进行了比较和校准。总体目标是通过实验确定（N​​）AIS传递函数。产生了单车移动性标准品，241-Am充电器离子和银颗粒，并将其用作校准气溶胶。高分辨率DMA用于分离较小的离子（1-10 nm），而直径较大（4-40 nm）的离子则采用HAUKE型DMA。 （N）AIS检测到的负离子迁移率的准确性略高于阳性，但两者均被高估了。斜率对整个运动数据集的线性拟合表明，（N）AISs测量的负运动比参考仪器大1.36±0.16倍。同样，测得的阳性迁移率是参考仪器的1.39±0.15倍。完全精确的单车移动性标准进行了测量。将（N）AIS浓度与气溶胶静电计（AE）和冷凝粒子计数器（CPC）进行比较。在小于1.5 nm（正）和3 nm（负）的尺寸下，离子光谱仪检测到较高的浓度，而在较大的尺寸下，它们显示出与参考仪器相似的浓度。通过NAIS测量的总颗粒浓度在4-40 nm尺寸的参考CPC浓度的±50％之内。根据测量条件和极性，确定在中性粒子测量中NAIS的最小截止尺寸在1.5和3 nm之间。

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