Application of Two-wavelength Bichromatic Correlation Method to Calculate the Average Surface Energy and Water Vapor Fluxes in Plantation North China

doi:10.3969/j.issn.1000-6362.2018.06.003

Abstract

Abstract: A field campaign which measuring heat fluxes based on the optical-microwave scintillometer (OMS), was conducted in the plantation ecosystems in the hilly area of North China. The differences between the results of OMS and Eddy Covariance (EC) system were compared in details, the impact of OMS results on the energy balance was estimated, and affecting factors of OMS were also discussed. Results showed that, the sensible heat flux observed by OMS is in favorable consistency with the EC observations, while the latent heat flux estimated by the OMS system is overvalued by 28%. The energy balance observed by the OMS system was over-closed and with an excess of 5%, because of the overestimation of latent heat flux. Bowen ratio and wind speed have great influences on the OMS. As a new method for measuring surface energy and water vapor fluxes, OMS can simultaneously and directly measuring sensible heat flux and latent heat flux at the regional scale, shortening the sampling interval, reducing the statistical uncertainties, contributing to a more accurate measurement of the heat flux and benefit for the further research of the energy balance.

Key words: Microwave scintillometer, Large aperture scintillometer, Bowen ratio, Source area, Energy balance ratio, Evapotranspiration, Plantation

ZHANG Gong,ZHANG Jin-song,MENG Ping,ZHENG Ning. Application of Two-wavelength Bichromatic Correlation Method to Calculate the Average Surface Energy and Water Vapor Fluxes in Plantation North China[J]. Chinese Journal of Agrometeorology, 2018, 39(06): 380-389.

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