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首页> 外文期刊>Aerosol and Air Quality Research >Consistency of Urban Background Black Carbon Concentration Measurements by Portable AE51 and Reference AE22 Aethalometers: Effect of Corrections for Filter Loading
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Consistency of Urban Background Black Carbon Concentration Measurements by Portable AE51 and Reference AE22 Aethalometers: Effect of Corrections for Filter Loading

机译：便携式AE51和参考AE22湿度计测量城市本底黑碳浓度的一致性：过滤器负载校正的影响

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combustion-related air pollutants. We collected 786 hourly averaged equivalent black carbon (eBC) measurements from co-located duplicate portable AE51 Aethalometers and a UK Government reference AE22 Aethalometer (the data for the latter were corrected for filter darkening effects using a standard procedure), at an urban background site in Glasgow, UK. The AE51 and the reference concentrations were highly correlated ( R ~(2) ≥ 0.87) for the combined deployment periods. The application of a previously reported method for correcting the AE51’s underestimation of concentrations, associated with filter loading, generally led to an overestimation of values (specifically, the normalised mean bias values for the two AE51s increased from –2% and +3% to +14% and +25% across the full range of measurements after correction). We found only limited and inconsistent evidence that the AE51 Aethalometers (attenuation [AE51_ATN] ≤ ~52) underestimated the eBC concentrations compared to the reference measurements. Thus, our observations indicate that the AE51 can achieve close agreement with the reference AE22 monitor without applying corrections for filter loading at relatively low AE51_ATN values in environments with low eBC concentrations.
机译：与燃烧有关的空气污染物。我们在市区背景站点上，从位于同一地点的重复便携式AE51湿度计和英国政府参考AE22湿度计（使用标准程序对滤光器变暗效果进行了校正）中收集了786小时的平均等效黑碳（eBC）测量值在英国格拉斯哥。在联合部署期间，AE51和参考浓度高度相关（R〜（2）≥0.87）。应用先前报告的校正AE51的浓度低估（与过滤器负载有关）的方法通常会导致值的高估（具体来说，两个AE51的归一化平均偏差值从–2％和+ 3％增加到+校正后在整个测量范围内分别为14％和+ 25％）。我们发现仅有有限且不一致的证据表明，与参考测量值相比，AE51湿度计（衰减[AE51_ATN]≤〜52）低估了eBC浓度。因此，我们的观察结果表明，在eBC浓度较低的环境中，AE51可以在不使用相对较低AE51_ATN值的情况下对滤镜负载进行校正的情况下，与AE22监控器达到一致的效果。

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