Characteristics and sources of dicarbonyl compounds during summer photochemical pollution episodes in Wuhan
HUANG Hai-bin1, CHENG Hai-rong1, HU Ke2, HUANG Yu3, DENG Meng-jie1, TAO Hui-ting1
1. School of Resource and Environmental Sciences, Wuhan University, Wuhan 430079, China; 2. Wuhan Environment Monitoring Center, Wuhan 430015, China; 3. Wuhan Ecological Environment Science and Technology Center, Wuhan 430023, China
Abstract：Field measurements of atmospheric carbonyl compounds and volatile organic compounds (VOCs) were conducted during the summer photochemical pollution process in Wuhan in 2021. This study focused on the pollution characteristics of glyoxal and methylglyoxal and analyzed their sources using positive matrix factor model (PMF). The average concentrations of glyoxal and methylglyoxal in Wuhan were (0.42±0.34)×10-9and (0.69±0.19)×10-9, respectively, and both showed a "unimodal type" diurnal pattern, peaking at 10a.m. Six sources were identified using PMF. The contributions of these sources to glyoxal were in the order of secondary formation (A) (70.86%) > solvent usage (8.05%) > vehicle emission (8.04%) > combustion (6.43%) > industrial emission (3.38%) > secondary formation (B). The contributions of different sources to methylglyoxal were in the order of secondary formation (A) (39.10%) > secondary formation (B) (31.54%) > vehicle emission (13.26%) > solvent usage (8.21%) > combustion (5.80%) > industrial emission (2.09%). Due to the strong photochemical reactions in summer, secondary formation was the most important source of glyoxal and methylglyoxal. Compared with those during the non-episodes, the contribution of secondary formation (A) to glyoxal and methylglyoxal increased significantly during the O3-polluted photochemical episodes. This study helps to improve the understanding of glyoxal and methylglyoxal in Wuhan, and provides valuable datasets for the government of Wuhan to formulate air pollution prevention and control strategies.
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