Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS04] Atmospheric Chemistry

Wed. May 29, 2019 1:45 PM - 3:15 PM 102 (1F)

convener:Tomoki Nakayama(Graduate School of Fisheries and Environmental Sciences, Nagasaki University), Yoko Iwamoto(Graduate School of Biosphere Science, Hiroshima University), Sakae Toyoda(Department of Chemical Science and Engineering, Tokyo Institute of Technology), Nawo Eguchi(Kyushu University), Chairperson:Takashi Maki(気象研究所)

2:15 PM - 2:30 PM

[AAS04-08] Sources of atmospheric black carbon and related carbonaceous components at Rishiri Island, Japan

*Chunmao Zhu1, Yugo Kanaya1, Hisayuki Yoshikawa2, Tomohisa Irino2, Osamu Seki2, Yasunori Tohjima3 (1.Japan Agency for Marine-Earth Science and Technology, 2.Hokkaido University, 3.National Institute for Environmental Studies)

Keywords:Aerosols, Biomass burning, Levoglucosan, Black carbon, FLEXPART

A field study was conducted to clarify sourcesof atmospheric black carbon and related carbonaceous components at Rishiri Island, Japan. We quantified equivalent black carbon (eBC) particle mass and the absorption Ångström exponent (AAE), atmospheric CO and CH4, in addition to levoglucosan in total suspended particles, a typical tracer of biomass burning. Sixteen high eBC events were identified attributable to either anthropogenic sources or biomass burning in Siberia/China. These events were often accompanied by increases of co-emitted gases such as CH4and CO. Specifically, we observed pollution events with elevated eBC, AAE, levoglucosan, and CH4–CO slope in late July 2014, which were attributed to forest fires in Siberia by reference to the FLEXPART model footprint and fire hotspots. In autumn, drastic increases of eBC, AAE, and levoglucosan were observed, accompanied by an eBC–CO slope of >15 ng m−3/ppb, resulting from long-range transport of emissions from extensive burning of crop residue on the Northeast China Plain. Other than the sources of fossil fuel combustion in China and forest fires in Siberia, we also report that pollution events in northern Japan are caused by crop residue burning in China. This study elucidated valuable information that will improve understanding of the effects of biomass burning in East Asia on atmospheric carbonaceous components.