http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Scott D. Chambers (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Chambers, Scott D.,Kim, Ki-Hyun,Kwon, Eilhann E.,Brown, Richard J.C.,Griffiths, Alan D.,Crawford, Jagoda Elsevier 2017 Science of the Total Environment Vol.580 No.-
<P><B>Abstract</B></P> <P>The combined influences of recent mitigation measures on urban air quality have been assessed using hourly observations of the criteria air pollutants (NO, NO<SUB>2</SUB>, O<SUB>3</SUB>, CO, and SO<SUB>2</SUB>) made from the Yongsan district of Seoul, Korea, over 26years (1987 to 2013). A number of data selection criteria are proposed in order to minimize variability associated with temporal changes (at diurnal, weekly, and seasonal timescales) in source strengths, their spatial distribution, and the atmospheric volume into which they mix. The temporal constraints required to better characterize relationships between observed air quality and changes in source strengths in Seoul were identified as: (i) a 5-hour diurnal sampling window (1300–1700h), (b) weekday measurements (Monday to Friday only), and (c) summer measurements (when pollutant fetch is mostly Korea-specific, and mean wind speeds are the lowest). Using these selection criteria, we were able to closely relate long-term trends identified in criteria pollutants to a number of published changes to traffic-related source strengths brought about by mitigation measures adopted over the last 10–15years.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Improved long-term analysis of urban air quality in the central Seoul region. </LI> <LI> We demonstrate the existence, magnitude, and temporal changes of ambient air pollutants. </LI> <LI> Improved analysis techniques for investigating long-term changes in urban air pollution. </LI> <LI> Clearly demonstrate the efficacy of mitigation measures on Seoul air quality since 1987. </LI> <LI> Identify causes of large inter-annual variability in Seoul air quality in summer. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
-
부준오,송정민,김원형,강창희,Scott D. Chambers,Alastair G. Williams,이철규 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.6
Real-time monitoring of hourly atmospheric Radon-222 concentration and three daily monitoring of the secondary aerosol components of PM10 were performed throughout 2011–2014 at Gosan station, Jeju Island, in order to characterize their background levels and temporal variation. The annual mean radon and PM10 mass concentrations were 2326 ± 1198 mBq/m3 and 37.1 ± 19.5 µg/m3, respectively. Based on cluster analyses of air mass back trajectories, the frequencies of air masses originating from continental China, the Korean Peninsula, and North Pacific Ocean routes were 53, 28, and 19%, respectively. When the air masses were transported to Jeju Island from continental China, the concentrations of radon and secondary aerosol components (nss-SO4 2 −, NO3 −, NH4 +) were relatively high: 2577 mBq/m3 and 14.4 µg/m3, respectively. In cases when the air masses have moved from the Korean Peninsula, the corresponding concentrations were 2247 mBq/m3 and 11.4 µg/m3, respectively. On the other hand, when the air masses came from the North Pacific Ocean, their radon and secondary aerosol concentrations decreased much further, 1372 mBq/m3 and 10.5 µg/m3, respectively. Consequently, the variability of atmospheric radon concentrations at Gosan station might be characterized by synoptic changes in air mass fetch as well as diurnal changes in atmospheric mixing depth.
-
부준오,송정민,김원형,강창희,송상근,Alastair G. Williams,Scott D. Chambers 한국대기환경학회 2017 Asian Journal of Atmospheric Environment (AJAE) Vol.11 No.2
Real-time monitoring of hourly concentrations of atmospheric Radon-222 (222Rn, radon) and some gaseous pollutants (SO2, CO, O3) was performed throughout 2013-2014 at Gosan station of Jeju Island, one of the cleanest regions in Korea, in order to characterize their background levels and temporal variation trend. The hourly mean concentrations of radon and three gaseous pollutants (SO2, CO, O3) over the study period were 2216±1100 mBq/m3, 0.6±0.7 ppb, 211.6±102.0 ppb, and 43.0±17.0 ppb, respectively. The seasonal order of radon concentrations was as fall (2644 mBq/m3)≈winter (2612 mBq/ m3)>spring (2022 mBq/m3)>summer (1666 mBq/ m3). The concentrations of SO2 and CO showed similar patterns with those of radon as high in winter and low in summer, whereas the O3 concentrations had a bit different trend. Based on cluster analyses of air mass back trajectories, the air mass frequencies originating from Chinese continent, North Pacific Ocean, and the Korean Peninsula routes were 30, 18, and 52%, respectively. When the air masses were moved from Chinese continent to Jeju Island, the concentrations of radon and gaseous pollutants (SO2, CO, O3) were relatively high: 2584 mBq/m3, 0.76 ppb, 225.8 ppb, and 46.4 ppb. On the other hand, when the air masses were moved from North Pacific Ocean, their concentrations were much low as 1282 mBq/m3, 0.24 ppb, 166.1 ppb, and 32.5 ppb, respectively.
-
Bu, Jun-Oh,Song, Jung-Min,Kim, Won-Hyung,Kang, Chang-Hee,Song, Sang-Keun,Williams, Alastair G.,Chambers, Scott D. Korean Society for Atmospheric Environment 2017 Asian Journal of Atmospheric Environment (AJAE) Vol.10 No.2
Real-time monitoring of hourly concentrations of atmospheric Radon-222 ($^{222}Rn$, radon) and some gaseous pollutants ($SO_2$, CO, $O_3$) was performed throughout 2013-2014 at Gosan station of Jeju Island, one of the cleanest regions in Korea, in order to characterize their background levels and temporal variation trend. The hourly mean concentrations of radon and three gaseous pollutants ($SO_2$, CO, $O_3$) over the study period were $2216{\pm}1100mBq/m^3$, $0.6{\pm}0.7ppb$, $211.6{\pm}102.0ppb$, and $43.0{\pm}17.0ppb$, respectively. The seasonal order of radon concentrations was as fall ($2644mBq/m^3$)$${\sim_\sim}$$winter ($2612mBq/m^3$)>spring ($2022mBq/m^3$)>summer ($1666mBq/m^3$). The concentrations of $SO_2$ and CO showed similar patterns with those of radon as high in winter and low in summer, whereas the $O_3$ concentrations had a bit different trend. Based on cluster analyses of air mass back trajectories, the air mass frequencies originating from Chinese continent, North Pacific Ocean, and the Korean Peninsula routes were 30, 18, and 52%, respectively. When the air masses were moved from Chinese continent to Jeju Island, the concentrations of radon and gaseous pollutants ($SO_2$, CO, $O_3$) were relatively high: $2584mBq/m^3$, 0.76 ppb, 225.8 ppb, and 46.4 ppb. On the other hand, when the air masses were moved from North Pacific Ocean, their concentrations were much low as $1282mBq/m^3$, 0.24 ppb, 166.1 ppb, and 32.5 ppb, respectively.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
