Abstract Number: 147 Working Group: Aerosol Chemistry
Abstract Real-time measurements of ambient auto-fluorescent suspended particles were conducted from 17 September to 14 December, 2011 using the WIBS-4 instrument at Fukue Island (32.75N, 128.68E) in Japan. We detected more than 0.2 billion particles whose diameter is larger than 0.8um during the observation period, and the ratio of the fluorescent particles which were sum of seven categorized fluorescent particles in fine (Dp = 0.8 -2.5um) and coarse (Dp > 2.5um) modes to those total varied in the range of 2.0 – 65.5% with average of 19.9% and 11.3-96.2% with average of 47.8%, respectively. Of those particles, fluorescent bioaerosol particles (FBAPs) defined in the WIBS-4 instrument were in the range of 2.7 – 86.1% with average of 12.7% in coarse mode particles. By comparison of signal intensities detected as a FBAP, there are two types FBAPs (tryptophan and NADH types). It was suggested that tryptophan type of FBAPs concentration increased in ambient relative humidifies, implying that these FBAPs might be attributed to a kind of fungal spores emitted from around observed station.