Characterization of seasonal variation of non-methane hydrocarbons in the urban atmosphere in Shenzhen
ZHU Bo1, WANG Chuan1, YU Guang-he2, ZENG Li-min3, HUANG Xiao-feng1, HE Ling-yan1
1. Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Shenzhen Graduate School, Peking University, Shenzhen 518055, China;
2. Environmental Laboratory, Shenzhen Research Institute of Peking University, Shenzhen 518057, China;
3. State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Science and Engineering, Peking University, Beijing 100871, China
Online GCMS-QP2010 was utilized to monitor 56kinds of atmospheric non-methane hydrocarbons (NMHCs) during the four seasons from 2015 to 2016 in Shenzhen. The annual mean concentration of total NMHCs was 23.6×10-9, while the highest total concentration of NMHCs was found in winter, followed by autumn, and the minimal concentration occurred in summer and spring. Alkanes were the most abundant components (65.4%~74.7%) in atmospheric NMHCs in Shenzhen, followed by aromatics (13.3%~21.7%) and alkenes (7.1%~11.6%). We also found that the concentrations of propane, toluene, ethane, hexane, butane, acetylene, 2-methyl pentane, isobutane, ethene and 3-methyl pentane ranked the top ten species in the measured NMHCs. The results of correlation and diurnal variation analysis indicated that atmospheric NMHCs in Shenzhen were simultaneously influenced by vehicle emission, industrial sources (e.g., solvent evaporation) and plant emission. Toluene, 2-methyl pentane, 3-methyl pentane and hexane were predominantly affected by industrial sources, while isoprene was mainly from natural sources.
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