The spatial and temporal variations of CO2 concentrations and radiative forcing (RF) due to CO2 were examined at urban center (Yeon-dong) during 2010-2015 and background sites (Gosan) during 2010-2014 on Jeju Island. The RF at the two sites was estimated based on a simplified expression for calculating RF for the study period. Overall, annual mean CO2 concentrations at the Yeon-dong and Gosan sites have gradually increased, and the concentrations were higher at Yeon-dong (401-422 ppm) than at Gosan (398-404 ppm). The maximum CO2 concentrations at the two sites were observed in winter or spring, followed by fall and summer, with higher concentrations at Yeon-dong. The RF at Yeon-dong (annual mean of up to 0.70 W/m2 in 2015) was higher than that at Gosan (up to 0.46 W/m2 in 2014), possibly because of higher CO2 concentrations at Yeon-dong resulting from population growth and human activities (e.g., fossil fuel combustion). The highest monthly mean RFs at Yeon-dong (approximately 0.92 W/m2) and Gosan (0.52 W/m2) were observed in spring 2015 (Yeon-dong) and spring 2013 (Gosan), whereas the lowest RFs (0.17 and 0.31 W/m2, respectively) in fall 2011 (Yeon-dong) and summer in 2012 (Gosan).

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 대상 지역
  2.2. 연구방법
 3. 결과 및 고찰
  3.1. 도심 및 배경지점의 CO2 농도 시·공간 분포
  3.2. 도심 및 배경지점의 CO2 농도에 따른 복사강제력및 기온변화 산출
 4. 요약 및 결론
 REFERENCES

• 이수정(제주대학교 해양과학대학 지구해양과학과, Department of Earth and Marine Sciences, Jeju National University) | Soo-Jeong Lee
• 송상근(제주대학교 해양과학대학 지구해양과학과, Department of Earth and Marine Sciences, Jeju National University) | Sang-Keun Song Corresponding author
• 박연희(제주대학교 해양과학대학 지구해양과학과, Department of Earth and Marine Sciences, Jeju National University) | Yeon-Hee Park