| Item type |
琉球大学リポジトリ登録用アイテムタイプ(1) |
| 公開日 |
2023-12-06 |
| タイトル |
|
|
タイトル |
Effects of changes in polycyclic aromatic hydrocarbons (PAHs) emissions and degradation on their concentrations in Tokyo from 2007 and 2016 |
|
言語 |
en |
| 作成者 |
Shimada, Kojiro
Nohchi, Masayuki
Maeshima, Koji
Uchino, Tomonori
Kobayashi, Yusuke
Ogata, Hiroko
Katsumi, Naoya
Inazu, Koji
Okochi, Hiroshi
|
| アクセス権 |
|
|
アクセス権 |
open access |
|
アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 権利情報 |
|
|
言語 |
en |
|
権利情報 |
© The Author(s) 2022 |
| 権利情報 |
|
|
言語 |
en |
|
権利情報Resource |
https://creativecommons.org/licenses/by/4.0/. |
|
権利情報 |
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. |
| 内容記述 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
The concentrations of polycyclic aromatic hydrocarbons (PAHs) in aerosol were measured in Shinjuku, which is central Tokyo, Japan, for 10 years from 2007 to 2016. The effects of changes in emission sources and their degradation by reaction with ozone were assessed in this study. There was no significant increasing or decreasing trend of the PAH concentrations during 10 years (P > 0.05). The average selected seven the PAH concentrations (0.88 ng m−3) during 10 years was lower than those in New York and Paris. However, the trend of ozone concentrations is increasing in central Tokyo. This inconsistency raises a question. Did the fact that the ozone concentration was higher than the PAH concentrations promote PAH degradation? To apportion the PAH sources, we used PAH concentration profiles and positive matrix factorization analysis. The contribution of vehicle emissions to the PAHs ranged from 40 to 80%. Ozone concentrations increased by 3.70%/year during 10 years. The theoretical degradation rates of PAHs by ozone, which were calculated using a pseudo-first-order rate equation, suggested that the lifetimes of benzo[a]pyrene (BaP) decreased by 1 min from 2007 to 2016. We investigated the aging of BaP using the profile of the isomer ratios. We found that the aging of BaP at the urban and roadside sites were nearly identical indicating aging regardless of the season. Although the decomposition of BaP is promoted by the photochemical oxidation reaction, this result suggests that a certain threshold value exists as the degree of the decomposition. This degradation of PAH can improve chemical loss processes in air quality model. |
|
言語 |
en |
| 出版者 |
|
|
出版者 |
© The Author(s) 2022 |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 出版タイプ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| 識別子 |
|
|
識別子 |
https://doi.org/10.1038/s41598-022-08138-8 |
|
識別子タイプ |
DOI |
| 収録物識別子 |
|
|
収録物識別子タイプ |
EISSN |
|
収録物識別子 |
20452322 |
| 収録物名 |
|
|
収録物名 |
scientific reports |
|
言語 |
en |
| 書誌情報 |
号 4249,
p. 1-9,
発行日 2022-03-11
|
S_No4249p0.pdf (1.3 MB)
