Japan Geoscience Union Meeting 2016

Presentation information


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

[A-AS12] Atmospheric Chemistry

Wed. May 25, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Hitoshi Irie(Center for Environmental Remote Sensing, Chiba University), Toshinobu Machida(National Institute for Environmental Studies), Hiroshi Tanimoto(National Institute for Environmental Studies), Yoko Iwamoto(Faculty of Science Division I, Tokyo University of Science)

5:15 PM - 6:30 PM

[AAS12-P17] Analysis of the Mixing State of Airborne Particles using a Tandem Combination of Laser-induced Fluorescence and Incandescence Techniques

*Fumikazu Taketani1, Yugo Kanaya1, Takayuki Nakamura2, Naoki Takeda2, Hiroyuki Koizumi2, Takuma Miyakawa1,3, Xiaole Pan1, Moteki Nobuhiro3, Noriyuki Hirayama2, Nobuyuki Takegawa3,4 (1.Japan Agency for Marine-Earth Science and Technology, 2.Fuji Electric Co. Ltd., 3.University of Tokyo, 4.Tokyo Metropolitan University)

Keywords:Black carbon, Fluorescent particles, Mixing state

We have developed a novel system for real-time measurement of the mixing state of aerosol particles using a tandem combination of laser-induced fluorescence (LIF) and incandescence (LII) techniques. The tandem analysis system comprises two chambers connected in series; particles are analyzed with LIF in the first chamber and LII in the second chamber. We analyzed identical particles using the two methods as judged by the time intervals of detection in the two chambers. This system provides information on the mixing state of fluorescent compounds and black carbon in single particles. Ground-based measurements of ambient particles were performed in Tokyo during October 26–29, 2012. We analyzed 43,881 particles with optical diameters greater than 0.4 mm. The fractions of particles with fluorescent composition, black carbon, and both were 14.2%, 2.3%, and 0.3%, respectively, which indicates the presence of internal mixtures of black carbon and fluorescent species in the ambient air for the first time. Mixtures of biological materials (estimated from fluorescence patterns) and black carbon were also detected. The fluorescence patterns of single particles with and without black carbon were almost identical, suggesting that particles with both black carbon and fluorescent composition might be formed by aggregation in ambient air.