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http://dx.doi.org/10.5532/KJAFM.2015.17.1.15

Corrections on CH4 Fluxes Measured in a Rice Paddy by Eddy Covariance Method with an Open-path Wavelength Modulation Spectroscopy  

Kang, Namgoo (Korea research Institute of Standards and Science)
Yun, Juyeol (Complex Systems Science Lab., Department of Landscape Architecture and Rural Systems Engineering, Seoul National University)
Talucder, M.S.A. (Interdisciplinary Program in Agricultural & Forest Meteorology, Seoul National University)
Moon, Minkyu (National Center for AgroMeteorology)
Kang, Minseok (National Center for AgroMeteorology)
Shim, Kyo-Moon (National Academy of Agricultural Science)
Kim, Joon (Complex Systems Science Lab., Department of Landscape Architecture and Rural Systems Engineering, Seoul National University)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.17, no.1, 2015 , pp. 15-24 More about this Journal
Abstract
$CH_4$ is a trace gas and one of the key greenhouse gases, which requires continuous and systematic monitoring. The application of eddy covariance technique for $CH_4$ flux measurement requires a fast-response, laser-based spectroscopy. The eddy covariance measurements have been used to monitor $CO_2$ fluxes and their data processing procedures have been standardized and well documented. However, such processes for $CH_4$ fluxes are still lacking. In this note, we report the first measurement of $CH_4$ flux in a rice paddy by employing the eddy covariance technique with a recently commercialized wavelength modulation spectroscopy. $CH_4$ fluxes were measured for five consecutive days before and after the rice transplanting at the Gimje flux monitoring site in 2012. The commercially available $EddyPro^{TM}$ program was used to process these data, following the KoFlux protocol for data-processing. In this process, we quantified and documented the effects of three key corrections: (1) frequency response correction, (2) air density correction, and (3) spectroscopic correction. The effects of these corrections were different between daytime and nighttime, and their magnitudes were greater with larger $CH_4$ fluxes. Overall, the magnitude of $CH_4$ flux increased on average by 20-25% after the corrections. The National Center for AgroMeteorology (www.ncam.kr) will soon release an updated KoFlux program to public users, which includes the spectroscopic correction and the gap-filling of $CH_4$ flux.
Keywords
Methane; Eddy Covariance; Flux correction; Laser spectroscopy; Rice paddy;
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