부산대학교 도서관

Continuous observations of organic nitrates were conducted from February to May 2022 at Fukue Island, Nagasaki, Japan. The average concentrations of PNs (Total peroxy nitrates) and ONs (Total organic nitrates) during the observation period were 0.44±0.33 and 0.26±0.14 ppbv (1σ), respectively. The air mass origins arriving at Fukue were classified into the following seven groups: Russia, Northern China (NC), Korea, Northern China/Korea (NC+KR), Southern China, Japan, and Ocean, using backward trajectory analyses, and the concentration variations for each air mass origin were investigated. In February and March, PNs and ONs concentrations from NC were the highest of the seven air mass origins. In April and May, however, PNs and ONs concentrations from NC decreased, while those from NC+KR were the highest. Such concentration variations would be attributed to the relationship between the atmospheric lifetime and the transport time from the Asian continent to Fukue. In April and May, the air masses from NC have long transport times and most of PNs would be lost before arriving at Fukue Island, while the air masses from NC+KR have shorter transport times than those from NC, and the percentage of PNs loss during the transport would be low.