Characterizing isotopic compositions of TC-C, NO3−-N, and NH4+-N in PM2.5 in South Korea: Impact of China's winter heating

• Published in: Environmental pollution (1987) Vol. 233; pp. 735 - 744
• Main Authors: Park, Yu-mi, Park, Kwang-su, Kim, Hyuk, Yu, Seok-min, Noh, Seam, Kim, Min-seob, Kim, Jee-young, Ahn, Joon-young, Lee, Min-do, Seok, Kwang-seol, Kim, Young-hee
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2018
• Subjects: aerosols; ammonia; Ammonium; ammonium nitrogen; China; coal; Coal combustion; combustion; heat; isotopes; Nitrate; nitrogen oxides; particulate emissions; particulates; PM2.5; seasonal variation; South Korea; Stable isotope; summer; winter; South Korea; China; Coal combustion; Ammonium; Stable isotope; Nitrate; PM2.5
• ISSN: 0269-7491; 1873-6424; 1873-6424
• DOI: 10.1016/j.envpol.2017.10.072

The origin of PM2.5 has long been the subject of debate and stable isotopic tools have been applied to decipher. In this study, weekly PM2.5 samples were simultaneously collected at an urban (Seoul) and rural (Baengnyeong Island) site in Korea from January 2014 through February 2016. The seasonal variation of isotopic species showed significant seasonal differences with sinusoidal variation. The isotopic results implied that isotope species from Baengnyeong were mostly originated from coal combustion during China's winter heating seasons, whereas in summer, the isotopic patterns observed that were more likely to be from marine. In Seoul, coal combustion related isotopic patterns increased during China's winter heating period while vehicle related isotopic patterns were dominated whole seasons by default. Therefore, aerosol formation was originated from long-range transported coal combustion-related NOx by vehicle-related NH3 in Seoul. δN-NH4+ in Seoul showed highly enriched 15N compositions in all seasons, indicating that NH3 from vehicle emission is the important source of NH4+ in PM2.5 in Seoul. In addition, Baengnyeong should be consistently considered as a key region for observing the changes of isotopic features depend on the contribution of individual emissions to the atmospheric as a result of the reduction of coal consumption in China. [Display omitted] •Isotope species from Baengnyeong were from coal combustion during China's heating.•In Seoul, vehicle related isotopic pattern was dominated whole seasons by default.•NH3 from vehicle is the important source of NH4+ in Seoul.