2024-03-29T06:29:06Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02019365
2023-08-03T05:37:47Z
1642838163960:1642838338003
1642838403551:1642838406414
Seasonal and annual changes in PAH concentrations in a remote site in the Pacifc Ocean
Miura, Kaori
Shimada, Kojiro
Sugiyama, Taichi
Sato, Kei
Takami, Akinori
Chan, K. Chak
Kim, Sun In
Kim, Pyo Yong
Lin, Neng-Huei
Hatakeyama, Shiro
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 Pacifc 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.
http://purl.org/coar/resource_type/c_6501
Springer Nature
2019-08-29
VoR
2045-2322
Scientific Reports
1
9
12591
eng
https://doi.org/10.1038/s41598-019-47409-9
open access
© The Author(s) 2019
Creative Commons Attribution 4.0 International License