Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Regional Background Levels of Carbon Monoxide Observed in East Asia during 1991~2004

1991~2004년 동아시아에서 관측한 일산화탄소의 지역적 배경 농도

  • Kim, Hak-Sung (Department of Earth Science Education, Korea National University of Education) ;
  • Chung, Yong-Seung (Korea-China Centre for Atmospheric Research)
  • 김학성 (한국교원대학교 지구과학교육과) ;
  • 정용승 (한.중대기과학연구센터)
  • Published : 2006.12.30
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Abstract

Data of the carbon monoxide concentration observed in Mt. Waliguan in China (WLG), Ulaan Uul in Mongolia (UUM), Tae-ahn Peninsula in Korea (TAP), and Ryori in Japan (RYO) were analyzed for a long period between 1991 and 2004. The annual average concentration of carbon monoxide was the highest at TAP $(233{\pm}41ppb)$ followed by $RYO(171{\pm}36ppb),\;UUM(155{\pm}26ppb),\;and\;WLG(135{\pm}22ppb)$. The seasonal variations being high in spring and low in summer were observed in other areas of Eastern Asia except WLG. TAP was high in carbon monoxide concentration in all seasons compared to WLG, UUM and RYO and shows wide distribution of concentration in the histogram, which is caused by the influence of large-scale air pollution due to its downwind location close to the East Asian continent, China in particular. Also, our data was compared with data measured at Mauna Loa (MLO) in Hawaii. According to the origin of the isentropic backward trajectory and its transport passage, carbon monoxide concentration observed in TAP was analyzed as follows: continental background airflows (CBG) were $216{\pm}47ppb$; regionally polluted continental airflows (RPC) were $316{\pm}56ppb$; Oceanic background airflows (OBG) were $108{\pm}41ppb$; and Partly perturbed oceanic airflows (PPO) were $161{\pm}6ppb$. The high concentration of carbon monoxide in TAP is due to the airflow from East Asian continent origin rather than that from the North Pacific origin. Especially, RPC which passes through the eastern China appeared to be the highest in concentration in spring, fall, and winter. However, OBG was affected by the North Pacific air mass with a low carbon monoxide concentration in summer. The NOAA satellite images and GEOS-CHEM model simulation confirmed a large-scale air pollution event that was in the course of expansion from southeastern China bound to the Korean Peninsula and the Korea East Sea by way of the Yellow Sea.

동아시아에서 일산화탄소의 지역적 배경 농도 수준을 분석하기 위해, 1991년부터 2004년까지 장기간 중국 Waliguan(WLG), 몽골이아의 Ulaan Uul(UUM), 한국의 태안반도(TAP), 일본의 Ryori(RYO)에서 관측한 일산화탄소 농도를 분석하였다. 연평균 일산화탄소 농도는 $WLG(135{\pm}22ppb),\;UUM(155{\pm}26ppb),\;RYO(171{\pm}36ppb),\;TAP(233{\pm}41ppb)$ 순서로 높은 농도를 보이고 있었다. WLG를 제외하고 전체적으로 봄철에 높고 여름철에 낮은 계절 변동의 특징은 동아시아 다른 지점들에서도 공통적으로 나타나고 있다. TAP는 WLG, UUM, RYO와 비교하여 전체 계절에 높은 일산화탄소 농도를 보이고 있으며 히스토그램에서 넓은 농도 분포를 보이는데 동아시아 대륙, 특히 중국의 가까운 풍하측에 위치하고 있어 광역적 대기 오염의 영향이 크기 때문이다. TAP는 중국 동부 지역을 경유하는 RPC가 봄, 가을, 겨울에서 높은 농도를 나타내었고, 여름철에는 저위도 북태평양으로부터의 OBG에 의해 낮은 일산화탄소 농도를 갖고 있는 해양성 기단의 영향을 받고 있다. NOAA 위성 영상과 GEOS-CHEM 모델 시뮬레이션은 중국 남동부 연안으로부터 황해를 거쳐 한반도와 동해로 확산하고 있는 광역적 대기오염 이동 사례를 확인하고 있다.

Keywords

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