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Quantification and implication of measurement bias of ambient atmospheric BC concentration
Atmospheric Environment ( IF 4.2 ) Pub Date : 2021-02-06 , DOI: 10.1016/j.atmosenv.2021.118244
Chaoliu Li , Chao Zhang , Shichang Kang , Örjan Gustafsson

Black carbon (BC) aerosols have severe impacts on climate and health. Most atmospheric BC loadings are now predominantly reported for the PM2.5 size cut-off. Based on 39 published set of ambient BC concentrations from around the world where PM2.5 and PM10 were collected in parallel, we demonstrate that BC in PM2.5 was only around 80% of that in PM10. The implication is that around 20% of BC in the global ambient atmosphere is ignored with the now-legacy PM2.5 sampling approach. Correspondingly, BC of freshly emitted particles from combustion activities is dominantly reported in terms of PM2.5, and thus inflicting a bias in the total BC emission inventories. A consequence is that ambient BC is underpredicted when derived from models based on (PM2.5) emission inventories. This consideration contributes to reconcile existing systematic offset between model predictions and observation-based estimates of climate-relevant effects of anthropogenic BC aerosols. We propose that total ambient BC concentration should be considered rather than the PM2.5 portion to reduce the uncertainties in estimates of BC effects on the climate.



中文翻译:

大气中BC浓度的测量偏差的量化及其含义

黑炭(BC)气雾剂对气候和健康产生严重影响。据报道,大多数大气中的BC负荷是PM 2.5尺寸的截止值。根据来自世界各地的39个已发布的环境BC浓度集合,其中并行收集PM 2.5和PM 10,我们证明PM 2.5中的BC仅约为PM 10中80%的。这意味着,现在的传统PM 2.5采样方法会忽略全球环境大气中约20%的BC 。相应地,燃烧活动中新散发的颗粒的BC以PM 2.5为主。,从而导致总的BC排放清单出现偏差。结果是,从基于(PM 2.5)排放清单的模型得出的环境BC会被低估。这种考虑有助于调和模型预测与基于观测的人为BC气溶胶气候相关效应的估计之间的系统性抵销。我们建议应考虑总的环境BC浓度而不是PM 2.5部分,以减少BC对气候影响的估计的不确定性。

更新日期:2021-02-10
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