| 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 |
2022-07-04 |
| タイトル |
|
|
タイトル |
Long-term Measurements of Carbonaceous Aerosol at Cape Hedo, Okinawa, Japan: Effects of Changes in Emissions in East Asia |
|
言語 |
en |
| 作成者 |
Shimada, Kojiro
Takami, Akinori
Ishida, Takatsugu
Taniguchi, Yuta
Hasegawa, Shuichi
Chan, K. Chak
Kim, Pyo Yong
Lin, Neng-Huei
Hatakeyama, Shiro
|
| 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). |
| 権利情報 |
|
|
言語 |
en |
|
権利情報Resource |
https://creativecommons.org/licenses/by/4.0/ |
|
権利情報 |
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited. |
| 主題 |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Carbonaceous aerosol |
| 主題 |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
CHAAMS |
| 主題 |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Fossil fuel combustion |
| 主題 |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Biomass burning |
| 主題 |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Long-term trend |
| 内容記述 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
We investigated the changes in the carbonaceous-aerosol sources and their effects on the long-term elemental carbon (EC) and organic carbon (OC) concentration trends at the Cape Hedo Atmosphere and Aerosol Monitoring Station (CHAAMS) in Okinawa, Japan, during the period 2004-2013. We obtained the EC and OC concentrations by conducting semi-real-time measurements using a carbon monitor, and performing an offline thermal/optical filter analysis according to the Interagency Monitoring of Protected Visual Environments (IMPROVE) protocol. The annual average concentration of the EC remained constant between 2004 and 2013, but that of the OC decreased at a rate of 0.11 µg C m^<-3> y^<-1> (α > 0.05). The secondary OC (SOC)/OC ratio showed an increasing trend from 2004 till 2011, which may have been caused by a reduction in primary emissions of OC and compositional changes in the organic compounds originating in China, from which air pollutants were frequently transported during spring and winter. Although the EC concentration did not change appreciably in either season, the OC concentration decreased at rates of 0.10 µg C m^<-3> y^<-1> and 0.11 µg C m^<-3> y^<-1> during spring and winter, respectively. We estimated the contributions from the various sources of carbonaceous aerosol, viz., biomass burning, fossil-fuel combustion, and air-pollutant transport from China, based on the OC/EC ratio, which decreased from 5.7 to 2.4 in terms of the annual average. The growing share from fossil-fuel combustion is responsible for the decline in biofuel-burning OC emissions transported from China to CHAAMS. |
|
言語 |
en |
| 出版者 |
|
|
出版者 |
Taiwan Association for Aerosol Research |
|
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 |
| 関連情報 |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
https://doi.org/10.4209/aaqr.200505 |
| 収録物識別子 |
|
|
収録物識別子タイプ |
PISSN |
|
収録物識別子 |
1680-8584 |
| 収録物識別子 |
|
|
収録物識別子タイプ |
EISSN |
|
収録物識別子 |
2071-1409 |
| 収録物名 |
|
|
収録物名 |
Aerosol and Air Quality Research |
|
言語 |
en |
| 書誌情報 |
巻 21,
号 9,
発行日 2021-09
|
aaqr-20-08-oa-0505.pdf (1.6 MB)
