Effects of Wind Speed and Direction on Eddy Fluxes over a Larch Plantation

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  • HIRATA Ryuichi
    Graduate School of Agriculture, Hokkaido University
  • HIRANO Takashi
    Graduate School of Agriculture, Hokkaido University
  • OKADA Keiji
    Graduate School of Agriculture, Hokkaido University
  • FUJINUMA yasumi
    Center for Global Environmental Research, National Institute for Environmental Studies
  • INUKAI Koh
    Center for Global Environmental Research, National Institute for Environmental Studies
  • SAIGUSA Nobuko
    National Institute of Advanced Industrial Science and Technology
  • YAMAMOTO Susumu
    National Institute of Advanced Industrial Science and Technology

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Abstract

The closure of energy balance is a useful measure for evaluating the quality of eddy flux measurements. However, it was reported that eddy enegy flux became imbalanced by available energy at many study sites. The energy imbalance is of a great interest to the flux community, whereas the problem remains unsolved. In this paper, we investigate the effects of wind speed, wind direction and phenology on eddy energy fluxes measured over a larch plantation to understand the mechanism of the energy imbalance. Flow distortion by the tower affected energy balance closure. If wind directions through the tower were excluded, energy balance was lower than the average of FLUXNET sites (Wilson et al., 2002). Energy balance was more closed in the summer than in the defbliate season. The larger imbalance of energy balance closure through defoliation was partly due to the increasing spatial variability of net radiation. Energy balance closure became worse under the conditions of low wind speed. Both sensible and latent heat fluxes increased with friction velocity.

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