Improvement of an Air Sampling System for the True Eddy Accumulation Technique

There are several kinds of techniques to measure vertical fluxes including the true eddy accumulation (TEA) technique. The significant advantages of the TEA technique are that it is a direct flux measurement technique and is applicable to the trace gases which require either slow response analyzer o...

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Veröffentlicht in:Journal of Agricultural Meteorology 2005, Vol.60(5), pp.529-532
Hauptverfasser: KOMORI, Daisuke, AOKI, Masatoshi, NAGASHIMA, Takuo, ISHIDA, Tomoyasu
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Sprache:eng
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Zusammenfassung:There are several kinds of techniques to measure vertical fluxes including the true eddy accumulation (TEA) technique. The significant advantages of the TEA technique are that it is a direct flux measurement technique and is applicable to the trace gases which require either slow response analyzer or installation of adsorbent for condensation. However, it is difficult to take air samples accurately according to vertical wind velocity with high time resolution. Therefore, we have developed an air sampling system that is suitable for the TEA technique.  The developed air sampling system was able to take air samples continuously in proportion to vertical wind velocity by 7 Hz. A preliminary field test showed that CO2 flux measured using the developed system was proportional to that measured using the eddy correlation technique. These results confirmed that the developed system for the TEA technique can be used to measure CO2 flux.  In the present research, the developed system was adapted to measurement of CO2, which is an inert gas, for the purpose of a performance test. In future applications, the system could be applied to measurements of vertical fluxes of other gases.
ISSN:0021-8588
1881-0136
DOI:10.2480/agrmet.529