Long-term Measurements of Carbonaceous Aerosol at Cape Hedo, Okinawa, Japan: Effects of Changes in Emissions in East Asia
- 주제(키워드) Carbonaceous aerosol , CHAAMS , Fossil fuel combustion , Biomass burning , Long-term trend
- 주제(기타) Environmental Sciences
- 설명문(일반) [Shimada, Kojiro; Kim, Yong Pyo; Lin, Neng-Hue; Hatakeyama, Shiro] Tokyo Univ Agr & Technol, Global Innovat Res Org, Tokyo, Japan; [Shimada, Kojiro; Ishida, Takatsugu; Taniguchi, Yuta; Hatakeyama, Shiro] Grad Sch Tokyo Univ Agr & Technol, Inst Agr, Tokyo, Japan; [Takami, Akinori] Natl Inst Environm Studies, Tsukuba, Ibaraki, Japan; [Hasegawa, Shuichi] Ctr Environm Sci Saitama, Kazo, Saitama, Japan; [Chan, Chak K.] City Univ Hong Kong, Sch Energy & Environm, Hong Kong, Peoples R China; [Kim, Yong Pyo] Ewha Womans Univ, Dept Chem Engn & Mat Sci, Seoul, South Korea; [Kim, Yong Pyo] Ewha Womans Univ, Dept Environm Sci & Engn, Seoul, South Korea; [Lin, Neng-Hue] Natl Cent Univ, Chungli, Taiwan; [Shimada, Kojiro] Waseda Univ, Sch Creat Sci & Engn, Tokyo, Japan; [Hatakeyama, Shiro] Asia Ctr Air Pollut Res, Niigata, Japan; [Shimada, Kojiro] Univ Ryukyus, Dept Chem Biol & Marine Sci, Okinawa 9030213, Japan
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- OA유형 gold
- 발행기관 TAIWAN ASSOC AEROSOL RES-TAAR
- 발행년도 2021
- URI http://www.dcollection.net/handler/ewha/000000183564
- 본문언어 영어
- Published As http://dx.doi.org/10.4209/aaqr.200505
초록/요약
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 mu g C m(-3) y(-1) (alpha > 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 mu g C m(-3) y(-1) and 0.11 mu g 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.
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