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Impact of biomass burning emissions on atmospheric aerosols

2018-04-10 66

Time:  13:30pm - 14:45 pm, 12th April 2018

Venue:  Lecture Hall 221, ISESS (Building No.16, Weijin Road Campus, Tianjin University)

Speaker:  Dr. Jinsang Jung,Principal Research Scientist at Center for Gas Analysis, Korea Research Institute of Standards and Science (KRISS)

Abstract: To investigate the impact of biomass-burning emissions on atmospheric aerosols, the biomass burning tracers; levoglucosan, mannonsan, galactosan, and K+ were measured at suburban and urban sites in Daejeon, Korea during the fall, 2012 and summer, 2014, respectively. The ratios of levoglucosan to mannosan, K+, organic carbon (OC), and elemental carbon (EC) show that biomass-burning aerosols in the suburban atmosphere in Daejeon during the fall, 2012 are emitted mainly from crop residue, grass, and leaf burnings. The contributions of biomass-burning emissions to OC and EC concentrations were 45% ± 12% and 12% ± 7.3%, respectively, indicating that a large fraction of OC was emitted from biomass burning. Extensive forest fires occurred during late July 2014 across the forested region of Siberia, Russia. Smoke plumes emitted from Siberian forest fires underwent long-range transport over Mongolia and northeast China to the Korean Peninsula, which is located ~3000 km south of the Siberian forest. Elevated concentration of levoglucosan was observed that was ~4.5 times higher than those observed during non-event periods in July 2014. The haze caused by the long-range transport of Siberian forest fire emissions was clearly identified by relatively high organic carbon (OC)/elemental carbon (EC) ratios (7.18±0.2) and OC/SO42- ratios (1.31±0.07) compared with those of the Chinese haze episode (OC/EC ratio: 2.4±0.4; OC= SO42- ratio: 0.21±0.05).