Gas-Particulate PAHs on distribution and long-range transport in Northeast Asia by Chemical Transport Model
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are one of toxic compounds in the atmosphere. PAHs are semivolatile organic compounds, and can therefore exist in both particle and gas-phases. Recent year, high concentrations of PM2.5 and these transboundary transport are focus on the global scale. Gas phase PAHs such as Pyrene react with mineral dust surface, and resulting with secondary production of 1-nitropyrene (1-NP). 1-NP is one of the most abundant NPAHs and considered as a probable carcinogen. It is necessary to investigate the gas phase PAH as well as particulate phase PAH. We investigated gas-particulated phase PAHs (9 species) were observed at China, Beijing, and Japan, Noto. These were investigated by using three dimensional chemical transport model, Regional Air Quality Model for POPs version. The model performance was investigated by the comparison with the observations. As for the gas-particle partitioning, we used Junge-Pankow model (JP) as well as Loman-Lammel model (LL).
Results with simulation by using JP and LL model, simulated concentrations of gas and particulate phase Pyr were consistent with those in the observed one within factor 10 at Beijing and Noto. Under the JP and LL model, only small differences for the simulated concentrations were found. In summer, pas phase Pyr was more than 50%, whereas that in winter were less than 20%. On the other hands, 5 and 6-rings PAH such as Benzo[a]pyrene (BaP) are associated with particles. We will discuss about the difference of long-range transport and these horizontal distribution of gas and particulate Pyr and particulate phase PAHs in Northeast Asian scale.- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.A51T2736I
- Keywords:
-
- 0305 Aerosols and particles;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0317 Chemical kinetic and photochemical properties;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0322 Constituent sources and sinks;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0365 Troposphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTURE