한국농림기상학회지, 제 9권 제4호(2007) (pISSN 1229-5671, eISSN 2288-1859)
Korean Journal of Agricultural and Forest Meteorology, Vol. 9, No. 4, (2007), pp. 268~276
DOI: 10.5532/KJAFM.2007.9.4.268
ⓒ Author(s) 2014. CC Attribution 3.0 License.


도시 – 전원간 이산화탄소(CO2) 농도구배 예비관측 결과

정유란, 이규종, 이변우
서울대학교 식물생산학부

(2007년 07월 20일 접수; 2007년 12월 04일 수락)

Preliminary Report of Observed Urban – Rural Gradient of
Carbon Dioxide Concentration across Seoul, Suwon,
and Icheon in South Korea

Uran Chung, Kyu-Jong Lee, Byun-Woo Lee
Department of Plant Science, Seoul National University, Seoul 151-742, Korea

(Received July 20, 2007; Accepted December 04, 2007)

ABSTRACT
Urban atmosphere may play as a harbinger for the future climate change with respect to temperature and CO2 concentration. The Seoul metropolitan area is unique in rapid urbanization and industrialization during the last several decades, providing a natural CO2 dome with increased temperature. This study was carried out to evaluate the feasibility of using the urban-rural environmental gradient in replacement of the IPCC mid-term scenario (after 30-50 years). For this, we measured atmospheric CO2 concentration and air temperature at three sites with different degree of urbanization (Seoul, Suwon, and Icheon). Results from 11-month measurement can be summarized as follows: (1) The annual mean CO2 concentration across 3 sites was in the order of Seoul (439 ppm) > Suwon (419 ppm) > Icheon (416 ppm), showing a substantial urban-rural environmental gradient. (2) The diurnal fluctuation in CO2 concentration was greater in summer than in winter, showing the effect of photosynthesis on local CO2 concentration. (3) The daily maximum CO2 concentration was observed at 0500 LST in spring and summer, 0800 LST in autumn, and 0900 LST in winter, showing the sunrise-time dependence. (4) The observed hourly maximum CO2 concentration averaged for the whole period was 446 ppm in Seoul at 0700 LST, while the minimum was 407 ppm in Suwon at 1500 LST. (5) Compared with the background atmospheric concentration of CO2 in Anmyeon-do (377.4 ppm annual mean), CO2 concentration of the study sites was higher by 14% in Seoul, by 10% in Suwon, and by 9% in Icheon. The observed CO2 concentration in Seoul reached already 98% of the 2030-2040 projection (450 ppm) and 80% of the 2040-2050 projection (550 ppm) under the IPCC BAU scenario, showing a feasibility of using the CO2 dome of Seoul as a natural experimental setting for the mid-term climate change impact assessment.

Keyword: Urban CO2 dome, Urban-rural environmental gradient, IPCC scenario

MAIN

적요

본 연구에서는 서울 도심과 전원 지역간 CO2 농도 차이가 IPCC 중단기 기후변화 시나리오에 상응하는 차이가 있는지를 확인하기 위해 수도권의 도시기후를 IPCC 기후변화 시나리오를 재현한 “천연실험실”로 활용하고자 서울(도심), 수원(부도심), 이천(전원), 3지역에서 2006년 6월 19일부터 2007년 6월 25일(2007년 3월 3일-5월 22일까지 결측)까지 CO2 농도를 관측하였으며 이 결과를 요약하면 다음과 같다.
1) 3지점의 연 평균 대기 중 CO2 농도의 구배가 서울(439 ppm)>수원(419 ppm)>이천(416 ppm)으로 나타났다.
2) 계절에 따른 CO2 농도의 일변화 변동폭은 여름철에 크게 나타난 반면 겨울철에는 그 폭이 완만해졌다.
3) 계절에 따른 시간대별 대기 중 CO2 농도는 여름철에는 대체로 새벽 5시에, 가을철에는 오전 8시에, 겨울철에는 오전 9시에, 봄철에는 새벽 5시에 고농도가 나타남으로써 고농도가 나타나는 시간대가 가을철부터 지연되었다가 다시 봄철에는 일출 전후로 옮겨갔다.
4) 시간대별 대기 중 CO2 농도는 일출 직후에 442ppm(서울: 0700 LST, Local Standard Time)으로 최대 농도를 보였으며, 최소 CO2 농도는 광합성이 활발한 오후 시간대로 407 ppm(수원: 1500 LST)으로 나타났다.
5) 배경대기관측소 안면도에서 산정한 배경 CO2 연 평균 농도 377 ppm에 대해 서울은 14%, 수원은 10%, 이천은 9% 높았으며, IPCC BAU Scenario의 2030-2040년 대기 중 CO2 농도인 450 ppm에 대해 서울은 이미 98%에 도달하였고, 2040-2050년의 550 ppm에 대해서는 80%에 도달하여 우리나라의 도시-전원(서울-이천)간 CO2 농도차이는 IPCC BAU Scenario의 20-30년 후의 기후변화 시나리오에 상응하는 것으로 판단된다.

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