Characterization of typical biomass burning tracers among atmospheric particles in urban Guangzhou

doi:10.7523/j.issn.2095-6134.2017.05.006

Abstract

Abstract: Size-resolved particle samples were collected at an urban site of Guangzhou during the summer and autumn.Samples were subjected to chemical analysis for obtaining various typical biomass burning tracers (levoglucosan (LG),mannosan (MN),and water-soluble potassium ion (K⁺)) and carbonaceous species including organic carbon (OC) in order to identify the major biomass burning particle type and quantify the contribution of biomass burning to OC abundance.Results showed that biomass burning tracers had dominant particle sizes of 0.44~1.00μm.High LG/MN and K⁺/LG ratios in the fine particle mode were found,which is consistent with the particle source profile emitted from agricultural residue burning.The LG/OC level during the autumn in urban Guangzhou was comparable to those in other Chinese cities during the biomass burning seasons.Based on a receptor model,the average contributions of biomass burning to OC during the summer and autumn were estimated to be 10.8% and 28.1h%,respectively,which implies that biomass burning sources,especially agricultural residue burning,cannot be ignored in the urban atmosphere in Guangzhou.Furthermore,relevant prevention suggestions were provided.

Key words: biomass burning, chemical tracers, atmospheric particles, urban Guangzhou

CLC Number:

X513

WANG Lijuan, WU Dalei, ZHANG Zhisheng. Characterization of typical biomass burning tracers among atmospheric particles in urban Guangzhou[J]. , 2017, 34(5): 567-572.

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