2016 年 31 巻 3 号 p. 194-202
Ground-based measurement for black carbon (BC) using a laser-induced incandescence technique was performed at NOTO Ground-based Research Observatory (NOTOGRO) in Suzu City, Ishikawa, Japan (37.45°N, 137.36°E) from April 17 to May 14 in 2013. Mass concentration of BC ranged 1.5–823 ng/m3 in 1-hour average. In the observed period, we captured East Asian outflow, the domestic and clean air masses by the analysis of backward trajectories. Temporal variations of BC number and mass distributions indicated that the size of BC particles in the East Asian outflow was the largest, followed by the domestic and clean air masses. The analysis of mixing state of BC indicated that the ratio of internally mixed BC particles in which diameter is 200±10 nm were 65%, 54%, 23% in the East Asian outflow, domestic air mass, and clean air mass, respectively. This result qualitatively supported that the degree of enhancement in light absorption observed by a photoacoustic soot spectrometer.
