한국 서해안 태안 소근리 갯벌의 메탄가스 발생량 특성
Evaluation of Basin-Specific CH4 emission flux from Intertidal Flat Sediments of Sogeun-ri, Taean, Mid-west Korea
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초록
2013년 3월과 8월 사이 총 3회에 걸쳐 챔버를 이용하여 충남태안 소근리 갯벌 퇴적물에서 가스들(메탄, 휘발성유기화합물, 이산화탄소, 산소 및 가연성 가스)의 방출량을 측정하였다. 챔버 내에서 채취된 메탄의 농도는 가스크로마토그래피를, 그 외 가스종은 Multi-gas monitor를 이용하여 측정하였다. 각 가스 종들의 배출량(+) 또는 흡수량(-)은 농도의 시간 변화율을 구한 후 1차 함수의 기울기를 이용하여 계산하였다. 다른 변수(퇴적물 함수율, 온도,총유기탄소, 평균입도크기 및 챔버 내 온도) 또한 같은 장소에서 측정하였다. 메탄은 +0.06~+0.60 mg/m2/hr, 이산화탄소는 +58.45~+95.58 mg/m2/hr, 산소는 –0.02~-0.20 mg/m2/hr 및 휘발성 유기화합물은 –0.60~+0.65 mg/m2/hr을 방출하거나 흡수하였다. 특히, 메탄은 여름철 높은 표층 퇴적물 온도(32.0~36.8℃)에서 양(+0.06~+0.18 mg/m2/hr)보다 봄철에는 상대적으로 낮은 온도(14.5℃)에서 더 많은 양(+0.60 mg/m2/hr)이 방출되었다. 퇴적물로부터 메탄의 방출량은 플럭스에 대한 표층퇴적물 입도 크기와 챔버 내부 온도와의 상관계수(R2)는 각각 -0.97, -0.89를 보였다.
Abstract
In March to August 2013, the emission of gases (CH4, VOC, CO2, O2, and LEL) was measured three times from theintertidal flat sediments at Sogeun-ri, Taean-gun, in the Mid-western seashore of Korea by using chamber method. Afteranalyzing gas emission concentrations inside of flux enclosure chamber by using a GC equipped with Agilent 6890. Thegas emission fluxes were calculated from a linear regression of the changes in the concentrations with time. The rangesof gas flux during the experimental period were +0.06~+0.60 mg/m2/hr for CH4, +58.45~+95.58 mg/m2/hr for CO2,-0.02~-0.20 mg/m2/hr for O2, and –0.60~+0.65 mg/m2/hr for VOC, respectively. The flux measurement results revealedthat CH4 fluxes during March in the relatively low sediment temperature (14.5℃) were significantly higher (+0.60mg/m2/hr) than during June and August (+0.06~+0.18 mg/m2/hr) in high sediment temperature (32.0~36.8℃). CH4 flux tomean size of sediments and temperature of inner chamber exhibited strong positive correlation (R2=-0.97 and R2=-0.89,respectively).
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