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首页> 外文期刊>Aerosol and Air Quality Research >Real-Time Performance of the microAeth? AE51 and the Effects of Aerosol Loading on Its Measurement Results at a Traffic Site
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Real-Time Performance of the microAeth? AE51 and the Effects of Aerosol Loading on Its Measurement Results at a Traffic Site

机译：microAeth的实时性能？ AE51及其在交通站点的气溶胶负载对其测量结果的影响

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The new portable microAeth? AE51 (AE51) is very useful for assessing occupational and environmental exposure to black carbon (BC) aerosols in epidemiological research. However, information about the performance of AE51 is limited. This study compares AE51 with the widely used, rack-mounted Aethalometer? AE31 (AE31) by evaluating the real-time performance of these two instruments, as carried out at a traffic site. Additionally, an optimized noise-reduction averaging (ONA) algorithm is adopted to eliminate the negative values in the BC data sets. Negative BC levels may be present using AE51 at low actual BC levels or at a high time-resolution. The negative values can be eliminated very effectively by the ONA method. The time-variation of the 5 min BC levels measured using AE51 is highly consistent with that measured using AE31. Loading effects on the measured BC levels are observed during the sampling period. Additionally, the correcting factor, k, is evaluated, in which the correcting factors are 0.0033 and 0.0039 for AE31 and AE51, respectively, when used to monitor the BC levels at this traffic site. The analytical results indicate that the BC levels are underestimated by up to 15% when the ATN-ATN0 increases to ~40. The measurement results also reveal that the BC levels measured by AE51 are approximately 14% higher than those measured using AE31. These results may be due to the different aerosol deposition velocities and mass attenuation cross-section parameters (σATN) of the two instruments.
机译：新的便携式microAeth？ AE51（AE51）对于评估流行病学研究中黑碳（BC）气溶胶的职业和环境暴露非常有用。但是，有关AE51性能的信息是有限的。这项研究将AE51与广泛使用的机架安装式湿度计进行了比较。 AE31（AE31）通过评估在交通站点执行的这两种仪器的实时性能。此外，采用了优化的降噪平均（ONA）算法来消除BC数据集中的负值。使用AE51可能会在较低的实际BC水平或较高的时间分辨率下出现负BC水平。通过ONA方法可以非常有效地消除负值。使用AE51测得的5分钟BC水平的时间变化与使用AE31测得的时间变化高度一致。在采样期间，观察到了对测量的BC水平的负载影响。此外，评估了校正因子k，其中，当用于监控此交通站点的BC水平时，AE31和AE51的校正因子分别为0.0033和0.0039。分析结果表明，当ATN-ATN0增加到〜40时，BC水平被低估了15％。测量结果还显示，通过AE51测量的BC水平比使用AE31测量的BC水平高约14％。这些结果可能是由于两种仪器的气溶胶沉积速度和质量衰减​​横截面参数（σATN）不同。

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