Seasonal and annual changes in PAH concentrations in a remote site in the Pacific Ocean

Kaori Miura, Kojiro Shimada, Taichi Sugiyama, Kei Sato, Akinori Takami, Chak K. Chan, In Sun Kim, Yong Pyo Kim, Neng Huei Lin, Shiro Hatakeyama

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

This paper reports the long term observation of particle-associated polycyclic aromatic hydrocarbons (PAHs) at Cape Hedo Atmosphere and Aerosol Monitoring Station, a remote site in the Western Pacific Ocean, from 2008 to 2015. This is the first long-term study that evaluated the contribution of long-range transport of PAHs in East Asia. No obvious trend (P > 0.05) was found in a particular season over the years. However, there are seasonal variations of PAH concentrations with higher in spring and winter. The higher PAH are attributed to air masses from the area including part of China. Source apportionment using three different approaches, i.e., PAH compositional pattern analysis, PAH diagnostic ratio analysis and positive matrix factorization modeling, showed the combined high contribution of biomass burning (18%, 14%) and coal combustion (33%, 24%) in spring and winter. In addition, the contribution of ship emissions (35%) was relatively high in spring, whereas that of vehicle emissions (36%) was relatively high in winter. The contribution of coal combustion to PAH has decreased throughout the years, likely due to changes in energy structure in China. The contribution of biomass burning to PAH has showed no trend, being stable, and that of vehicular emissions has increased.

Original languageEnglish
Article number12591
JournalScientific reports
Volume9
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'Seasonal and annual changes in PAH concentrations in a remote site in the Pacific Ocean'. Together they form a unique fingerprint.

  • Cite this

    Miura, K., Shimada, K., Sugiyama, T., Sato, K., Takami, A., Chan, C. K., Kim, I. S., Kim, Y. P., Lin, N. H., & Hatakeyama, S. (2019). Seasonal and annual changes in PAH concentrations in a remote site in the Pacific Ocean. Scientific reports, 9(1), [12591]. https://doi.org/10.1038/s41598-019-47409-9