The Effect of Coordinate Rotation on the Eddy Covariance Flux Estimation in a Hilly KoFlux Forest Catchment
2007
Renmin, Yuan (Yonsei University, Seoul, Republic of Korea) | Kang, M.S. (Yonsei University, Seoul, Republic of Korea) | Park, S.B. (Yonsei University, Seoul, Republic of Korea) | Hong, J.K. (University of Georgia, Griffin, GA, USA), E-mail: [email protected] | Lee, D.H. (Yonsei University, Seoul, Republic of Korea) | Kim, J. (Yonsei University, Seoul, Republic of Korea)
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 ± 0.05 ms-¹.
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