Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Measurement Uncertainty of Methane Concentrations from a Rice Paddy Measured by a Closed Automated Chamber System

벼논에서 폐쇄형 자동 챔버 시스템으로 측정한 메탄 농도에 대한 요인별 측정 불확도 비교

  • Ju, Ok Jung (Environmental Agriculture Research Division, Research and Development Bureau, Gyeonggi-do Agricultural Research and Extension Services) ;
  • Kang, Namgoo (Instrumentation Infrastructure Team, Advanced Measurement Instrumentation Institute, Korea Research Institute of Standards and Science) ;
  • Lim, Gap June (Environmental Agriculture Research Division, Research and Development Bureau, Gyeonggi-do Agricultural Research and Extension Services)
  • 주옥정 (경기도농업기술원 연구개발국 환경농업연구과) ;
  • 강남구 (한국표준과학연구원 첨단측정장비연구소 장비인프라팀) ;
  • 임갑준 (경기도농업기술원 연구개발국 환경농업연구과)
  • Received : 2020.06.25
  • Accepted : 2020.09.03
  • Published : 2020.09.30
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Abstract

BACKGROUND: The closed chamber method is the most commonly used for measuring greenhouse gas emissions from rice fields. This method has the advantages of being simple, easily available and economical. However, a measurement result using the chamber method is an estimated value and is complete when the uncertainty is estimated. The methane emissions from a rice paddy account for the largest portion of the greenhouse gas emissions in the agriculture sectors. Although assessment of uncertainty components affecting methane emission from a rice paddy is necessary to take account of dispersion characteristics, research on these uncertainty components is very rare to date. The goal of this study was to elucidate influencing factors on measurement uncertainty of methane concentrations measured by a closed automated chamber system from a rice paddy. METHODS AND RESULTS: The methane sampling system is located in the rice paddy in Gyeonggi-do Agricultural Research and Extension Services (37°13'15"N, 127°02'22"E). The primary measurement uncertainty components influencing methane concentrations (influencing factors) investigated in this research were repeatability, reproducibility and calibration in the aspects of methane sampling and analytical instrumentation. The magnitudes of the relative standard uncertainty of each influencing factor were quantified and compared. CONCLUSION: Results of this study showed what influencing factors were more important in determination of methane concentrations measured using the chamber system and analytical instrumentation located in the monitoring site. Quantifying the measurement uncertainty of the methane concentrations in this study would contribute to improving measurement quality of methane fluxes.

Keywords

References

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