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http://dx.doi.org/10.5532/KJAFM.2007.9.2.100

The Effect of Coordinate Rotation on the Eddy Covariance Flux Estimation in a Hilly KoFlux Forest Catchment  

Yuan, Renmin (Dept. of Atmospheric Sciences, Yonsei Univ.)
Kang, Min-Seok (Dept. of Atmospheric Sciences, Yonsei Univ.)
Park, Sung-Bin (Dept. of Atmospheric Sciences, Yonsei Univ.)
Hong, Jin-Kyu (Lab. for Environmental Physics, Dept. of Crop & Soil Sciences, University of Georgia)
Lee, Dong-Ho (Dept. of Atmospheric Sciences, Yonsei Univ.)
Kim, Joon (Dept. of Atmospheric Sciences, Yonsei Univ.)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.9, no.2, 2007 , pp. 100-108 More about this Journal
Abstract
The Gwangneung KoFlux supersite, located in a rugged mountain region, is characterized by a low wind speed due to a mountain-valley circulation and rolling terrain. Therefore, it is essential to understand the effect of coordinate rotation on flux measurements by the eddy-covariance method. In this paper, we review the properties of three orthogonal coordinate frames (i.e., double, triple, and planar fit rotations) and apply to flux data observed at the Gwangneung supersite. The mean offset of vertical wind speed of sonic anemometer was inferred from the planar fit (PF) coordinate rotation, yielding the diurnal variation of about $\pm0.05ms^{-1}$. Double rotation $(\bar{v}=\bar{w}=0)$ produced virtually the same turbulent fluxes of heat, water, and $CO_2$ as those from the PF rotation under windy conditions. The former, however, resulted in large biases under calm conditions. The friction velocity, an important scaling parameter in the atmospheric surface layer, was more sensitive to the choice of coordinate rotation method.
Keywords
KoFlux; Gwangneung supersite; Double rotation; Planar fit; Friction velocity;
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Times Cited By KSCI : 2  (Citation Analysis)
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