Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Measurement Uncertainty of Nitrous Oxide Concentrations from a Upland Soil Measured by an Automated Open Closed Chamber Method

밭토양에서 폐쇄형 자동 챔버법으로 측정한 아산화질소 농도에 대한 측정 불확도

  • 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 (Crop Research Division, Research and Development Bureau, Gyeonggi-do Agricultural Research and Extension Services)
  • 주옥정 (경기도농업기술원 연구개발국 환경농업연구과) ;
  • 강남구 (한국표준과학연구원 첨단측정장비연구소 장비인프라팀) ;
  • 임갑준 (경기도농업기술원 연구개발국 작물연구과)
  • Received : 2020.08.06
  • Accepted : 2020.09.09
  • 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 upland fields. This method has the advantages of being simple, easily available and economical. However, uncertainty estimation is essential for accurate assessment of greenhouse gas emissions and verification of emission reductions. The nitrous oxide emissions from upland field is very important for the nitrogen budget in the agriculture sectors. Although assessment of uncertainty components affecting nitrous oxide emission from upland field is necessary to take account of dispersion characteristics, research on these uncertainty components is very rare to date. This study aims at elucidation of influencing factors on measurement uncertainty of nitrous oxide concentrations measured by an automated open closed chamber method from upland field. METHODS AND RESULTS: The nitrous oxide sampling system is located in the upland field in Gyeonggi-do Agricultural Research and Extension Services (37°13'22"N, 127°02'22"E). The primary measurement uncertainty components influencing nitrous oxide concentrations (influencing factors) investigated in this research are repeatability, reproducibility and calibration in the aspects of nitrous oxide sampling and analytical instrumentation. The magnitudes of the relative standard uncertainty of each influencing factor are quantified and compared. CONCLUSION: Results of this study show what influencing factors are more important in determination of nitrous oxide concentrations measured using the automated open closed chambers located in the monitoring site. Quantifying the measurement uncertainty of the nitrous oxide concentrations in this study would contribute to improving measurement quality of nitrous oxide fluxes.

Keywords

References

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