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Practical applicability of high frequency correction theories to CO2 flux measured by a closed-path system

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Abstract

The theoretical correction of CO2 fluxes for high frequency attenuation in closed-path systems was re-summarized and its applicability examined using both measurements obtained at an Asiaflux forest site and empirical transfer functions used in previous studies. For our measurement system, the theoretical transfer function was applicable to high frequency correction, even when condensation occurred in the sampling line. Further, in respect to some measurement systems described in previous studies, it was found that the theoretical function was potentially applicable along with the empirical functions used. Meanwhile, in some systems significant errors could not be resolved by re-estimation of the theories. In these systems, because of undefined buffering effects, the actual response lag time decided by the maximum covariance method or by measurement of the system response time using tracer gas was significantly different from the lag time calculated from the tube dimensions and the measured flow rate. If the average flow rate calculated by the actual lag time was used to determine the theoretical function, the theoretical function became closer to, and sometimes agreed with, the empirical function. Any remaining deviation from each function might be associated with pressure fluctuations, but this problem was unable to be examined here. The results suggested that an empirical formulation for each site is considered applicable rather than a theoretical approach, although the theories are being developed to practical application.

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  1. Kyushu Research Center, Forestry and Forest Products Research Institute, 4-11-16, Kurokami, Kumamoto, Japan

    Takanori Shimizu

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  1. Takanori Shimizu
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Correspondence to Takanori Shimizu.

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Shimizu, T. Practical applicability of high frequency correction theories to CO2 flux measured by a closed-path system. Boundary-Layer Meteorol 122, 417–438 (2007). https://doi.org/10.1007/s10546-006-9115-z

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