Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Diurnal variations of fossil and nonfossil carbonaceous aerosols in Beijing
https://orcid.org/0000-0001-6395-7422
Abstract For the source apportionment of carbonaceous aerosols, measurement of 14C 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, and 14C, 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.
Highlights Diurnal variations of fossil and nonfossil total carbon were observed in Beijing. Contribution of fossil secondary organic aerosol (SOA) increased in daytime. This diurnal behavior was consistent with previous studies in other urban sites. Organic carbon was better reproduced by a VBS model than by a SOA yield model.
Diurnal variations of fossil and nonfossil carbonaceous aerosols in Beijing
https://orcid.org/0000-0001-6395-7422
Abstract For the source apportionment of carbonaceous aerosols, measurement of 14C 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, and 14C, 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.
Highlights Diurnal variations of fossil and nonfossil total carbon were observed in Beijing. Contribution of fossil secondary organic aerosol (SOA) increased in daytime. This diurnal behavior was consistent with previous studies in other urban sites. Organic carbon was better reproduced by a VBS model than by a SOA yield model.
Diurnal variations of fossil and nonfossil carbonaceous aerosols in Beijing
https://orcid.org/0000-0001-6395-7422
Abstract For the source apportionment of carbonaceous aerosols, measurement of 14C 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, and 14C, 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.
Highlights Diurnal variations of fossil and nonfossil total carbon were observed in Beijing. Contribution of fossil secondary organic aerosol (SOA) increased in daytime. This diurnal behavior was consistent with previous studies in other urban sites. Organic carbon was better reproduced by a VBS model than by a SOA yield model.
Diurnal variations of fossil and nonfossil carbonaceous aerosols in Beijing
Morino, Y. (Autor:in) / Ohara, T. (Autor:in) / Xu, J. (Autor:in) / Hasegawa, S. (Autor:in) / Zhao, B. (Autor:in) / Fushimi, A. (Autor:in) / Tanabe, K. (Autor:in) / Kondo, M. (Autor:in) / Uchida, M. (Autor:in) / Yamaji, K. (Autor:in)
Atmospheric Environment ; 122 ; 349-356
22.09.2015
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch