Abstract
This study evaluated energy balance closure in the eddy covariance method in a cool-temperate evergreen coniferous forest on steeply sloping topography in a region that experiences snowfall. We investigated the ratio of the sum of sensible and latent heat fluxes to available energy (the energy balance ratio; EBR) and the slope of the regression line of the eddy fluxes against available energy (closure ratio; CR). The 3 yr of continuous data were divided into snowfall (November-April) and snow-free periods (May-October). Uncorrected EBR and CR values at this site were 0.56 and 0.44 during the snowfall period and 0.69 and 0.60 during the snow-free period, respectively. Corrections of the storage term, the AOA error, and the inclined surface improved EBR by 2.0-2.6%, 8.3-8.9% and 4.9-5.9%, and improved CR by 5.3-5.8%, 5.6-7.9%, and 4.0-5.4%. Consequently, EBR and CR reached 0.86 and 0.79 during the snow-free period. By also considering the heat of fusion, EBR reached 0.79 during the snowfall period. Our findings suggest that heat fluxes of eddy-covariance measurements over a forest on steep slopes have a similar accuracy as those over other topography.
Original language | English |
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Pages (from-to) | 107-116 |
Number of pages | 10 |
Journal | Journal of Agricultural Meteorology |
Volume | 67 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2011 Sep 1 |
Keywords
- AsiaFlux TKC site
- Eddy-covariance
- Energy imbalance
- Mountainous regions
- Steep slope
ASJC Scopus subject areas
- Agronomy and Crop Science
- Atmospheric Science