Diurnal variations of fossil and nonfossil carbonaceous aerosols in Beijing
Diurnal variations of fossil and nonfossil carbonaceous aerosols in Beijing
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DOI：
10.1016/j.atmosenv.2015.09.055
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发表时间：
2015-12
影响因子：
5
通讯作者：
Y. Morino;T. Ohara;Jiayu Xu;S. Hasegawa;Bu Zhao;A. Fushimi;K. Tanabe;M. Kondo;M. Uchida;K. Yamaji;Liu Yang;Shaojie Song;W. Dong;Ye Wu;Shuxiao Wang;J. Hao
中科院分区：
文献类型：
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作者：
Y. Morino;T. Ohara;Jiayu Xu;S. Hasegawa;Bu Zhao;A. Fushimi;K. Tanabe;M. Kondo;M. Uchida;K. Yamaji;Liu Yang;Shaojie Song;W. Dong;Ye Wu;Shuxiao Wang;J. Hao
对于碳质气溶胶的源解析，14C的测量是一种有效的方法。特别是，化石和非化石碳质气溶胶的日变化提供了有关元素碳（EC）和有机碳（OC）的来源和生产途径的信息。2010年6月，利用时间分辨率为6 h的观测资料，对北京市中心附近的精细模式气溶胶（EC、OC和14 C）进行了观测。观测结果表明，在白天，化石次生有机气溶胶（SOA）的贡献增加。这一发现与之前在其他城市地区的研究一致，表明人为来源的SOA产生在城市地区很重要。我们评估了两个化学传输模型（CTM）与不同的SOA模型的模拟EC和OC的性能。两种模型均能较好地模拟EC浓度和日变化。OC浓度被低估了一半以上的CTM与SOA收益率模型，并更好地再现CTM与波动率基集（VBS）模型。然而，即使VBS模型低估了化石和非化石总碳（EC + OC），这种低估的可能原因进行了讨论。
For the source apportionment of carbonaceous aerosols, measurement of14C is an effective technique. In particular, diurnal variations of fossil and nonfossil carbonaceous aerosols provide information about the sources and production pathways of elemental carbon (EC) and organic carbon (OC). In this study, concentrations of fine-mode aerosols, including EC, OC, and14C, were observed with a time resolution of 6 h near the urban center of Beijing in June 2010. The observations indicate that the contribution of fossil secondary organic aerosol (SOA) increased during daytime. This finding is consistent with previous studies in other urban sites, suggesting that SOA production from anthropogenic sources is important in urban areas. We evaluated the performance of two chemical transport models (CTMs) with different SOA models on simulations of EC and OC. Both models well reproduced the concentration and diurnal variation of EC. OC concentrations were underestimated by more than half by the CTM with a SOA yield model, and were better reproduced by the CTM with a volatility basis set (VBS) model. However, even the VBS model underestimated both fossil and nonfossil total carbon (EC + OC), and possible reasons for this underestimation are discussed.