Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

A (Atmospheric and Hydrospheric Sciences) » A-CG Complex & General

[A-CG41] Biogeochemical linkages between the ocean and the atmosphere during phytoplankton blooms

Tue. May 22, 2018 3:30 PM - 5:00 PM 106 (1F International Conference Hall, Makuhari Messe)

convener:Yuzo Miyazaki(Institute of Low Temperature Science, Hokkaido University), Jun Nishioka(Hokkaido University, Institute of low temperature sciences), Koji Suzuki(北海道大学, 共同), Yoko Iwamoto(Graduate School of Biosphere Science, Hiroshima University), Chairperson:Nishioka Jun (Institute of low temperature science, Hokkaido University)

4:30 PM - 4:45 PM

[ACG41-11] Bioaerosol in the marine boundary layer measured using an epifluorescence technique

*Takuma Miyakawa1, Yugo Kanaya1, Fumikazu Taketani1, Kazuhiko Matsumoto1, Momoka Yoshizue2 (1.Japan Agency for Marine-Earth Science and Technology, 2.Tokyo University of Science)

Keywords:Bioaerosol, Maritime air

Bioaerosols which are primarily emitted into atmosphere (e.g., bacteria, fungal spore, pollen) play an important role in the climate change (as ice nucleating particles) and human health (as pathogens) (Frohlich-Nowoisky et al., 2016). Despite the fact raised above, the emission sources and mechanisms have not well characterized yet. One of the techniques to detect bioaerosol particles is autofluorescence which measures fluorescence from them excited by the light. Although autofluorescence is used for real-time monitoring of bioaerosol particles, this technique can be affected by the interference of non-biological compounds (Miyakawa et al., 2015). Epifluorescence, which is typically applied to microorganisms, can be used for the characterization of atmospheric bioaerosols (Hara and Zhang, 2012). Bioplorer (Koyo Sangyo) is an automated counting system of the bacterial concentrations on the chip with some reagent kits to stain bacteria (Nishimura et al., 2006). We have deployed autofluorescence instrument (WIBS4, DMT) and bioplorer in a wide range of atmospheric environment. We here present the temporal variations of bioaerosols measured using two techniques over the Southern Ocean in the late austral summer of 2017. We also discuss connections of behavior of bioaerosols with ocean and weather conditions.

Frohlich-Nowoisky et al. (2016), Bioaerosols in the Earth system: Climate, health, and ecosystem interactions, Atmos. Res., 182, 346-376.
Hara and Zhang (2012), Bacterial abundance and viability in long-range transported dust, Atmos. Environ., 47, 20-25.
Miyakawa et al. (2015), Ground-based measurement of fluorescent aerosol particles in Tokyo in the spring of 2013: Potential impacts of nonbiological materials on autofluorescence measurements of airborne particles, J. Geophys. Res., 120, doi:10.1002/2014JD022189.
Nishimura et al. (2006), Use of an automatic cell-counting system with LED illumination for enumeration of marine bacteria, Fisheries Science, 72: 723-727. doi: 10.1111/j.1444-2906.2006.01210.x