Institute of Nature and Environmental Technology Kanazawa University
抄録
Size fractionated airborne particulates including PM0.1 were simultaneously monitored at three
different sites in the Hokuriku region of Japan. These were Kanazawa, Suzu and Toyama. Research was
conducted over a three-year period between 2014 and 2016 in order to collect information concerning
the PM status and related seasonal patterns. Possible local emission sources of PM0.1 and the influence
of long-range transportation are discussed in relation to mass concentration and diagnostic parameters
defined by particle-bound carbonaceous components such as organic and elemental carbon, and their
ratios. The influence of trans-boundary air mass transport from outside Japan is also discussed based on
PM0.1 characteristics and air mass trajectory analyses. The seasonal behavior for PM concentrations
were similar between sites reflecting similar meteorological characteristics. Due to larger numbers of
emission sources, the PM at the Toyama site was the largest between the three sites while at the
Kanazawa site, precipitation in the spring and the summer was higher than in the autumn and winter
seasons and this may have resulted in a decrease in PM levels. The concentration and influence of
secondary organic carbon on the PM0.1 carbon content were largest at the Toyama site. The Py-OC/O4
ratio was consistent with increases in the number of hotspots in the spring and autumn. Carbonaceous
components in the PM0.1 fraction could be largely explained by local emission sources. However,
explaining the influence of the trans-boundary transportation of air pollutants only by the behavior of
carbonaceous components in PM0.1 may not be sufficient, and a more detailed discussion of various
chemicals in different sizes of particles is needed.
Seasonal Patterns, and Ambient PM0.1 Emission Sources in the Hokuriku Region in Japan
.png)
AA11430153_51-1-17.pdf
(1.86MB)
