Abstract
We developed a high-precision oxygen measurement system with long-term stability using a magneto-pneumatic oxygen analyzer for atmospheric observations. A high precision of 1.4 per meg (which is less than the Network compatibility goal of the Global Atmosphere Watch programme of the World Meteorological Organization) was achieved in a 12-day continuous measurement by maintaining the sample-gas pressure and temperature constant, and by correcting the measured values using a predetermined temperature correction factor. The oxygen measurement system does not require a control gas to compensate for signal drift. The calibration cycle was evaluated to be one week based on the Allan standard deviation. This indicates that the system can measure continuously for over one year without changing the cylinders for calibration gases. The developed oxygen measurement system is likely to be suitable for in situ atmospheric observation because of its high measurement precision and capability to use fewer high-pressure gas cylinders.
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