適切な平均化手法を導入した簡易渦集積法による汎用的なCO<sub>2</sub>フラックス測定システムの構築

DOI 日本農学文献記事索引 Web Site Web Site 被引用文献6件 参考文献41件
  • 植山 雅仁
    大阪府立大学大学院生命環境科学研究科
  • 鱧谷 憲
    大阪府立大学大学院生命環境科学研究科
  • 西村 渉
    大阪府立大学大学院生命環境科学研究科

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タイトル別名
  • A technique for high-accuracy flux measurement using a relaxed eddy accumulation system with an appropriate averaging strategy

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説明

Continuous observation of carbon dioxide (CO2) flux is an important issue to understand the global carbon cycle. Although the eddy covariance (EC) method is a promising means of measuring the fluxes, its high cost is often constraint. We therefore developed a technique for a high accuracy measurement system using a relaxed eddy accumulation (REA) method with an inexpensive gas analyzer, and tested the measurement system compared with the EC measurement at a cypress forest. Since spectral analysis revealed that the gas analyzer had both high and low frequency noise, we eliminated the former by using a moving average, and then calculated mean concentration with a shorter averaging period to avoid the low frequency noise, whereby the accuracy of the gas analyzer was improved at least 10-fold beyond the specification. The measured diurnal variation and the magnitude of CO2 fluxes by the EC and REA methods were almost identical, suggesting that our REA system was highly accurate as well as the EC system. The estimated root mean square error (RMSE) of the CO2 flux between the EC and the REA methods was 0.17 mg CO2 m-2 s-1. Although the open-path EC method could not be used to measure the flux during the rain event, spectral analysis suggested that the measured flux by the REA method was reliable during rainfall. The proposed measurement system will be applicable to the backup of the EC measurement as well as other trace gas flux measurements.

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  • 農業気象

    農業気象 65 (4), 315-325, 2009

    日本農業気象学会

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