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 |
|---|---|
| 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 |
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Keywords
- AsiaFlux TKC site
- Eddy-covariance
- Energy imbalance
- Mountainous regions
- Steep slope
ASJC Scopus subject areas
- Agronomy and Crop Science
- Atmospheric Science
Cite this
Energy Balance Closure Over a Cool Temperate Forest in Steeply Sloping Topography During Snowfall and Snow-Free Periods. / Saitoh, Taku M.; Tamagawa, Ichiro; Muraoka, Hiroyuki; Koizumi, Hiroshi.
In: Journal of Agricultural Meteorology, Vol. 67, No. 3, 01.09.2011, p. 107-116.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Energy Balance Closure Over a Cool Temperate Forest in Steeply Sloping Topography During Snowfall and Snow-Free Periods
AU - Saitoh, Taku M.
AU - Tamagawa, Ichiro
AU - Muraoka, Hiroyuki
AU - Koizumi, Hiroshi
PY - 2011/9/1
Y1 - 2011/9/1
N2 - 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.
AB - 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.
KW - AsiaFlux TKC site
KW - Eddy-covariance
KW - Energy imbalance
KW - Mountainous regions
KW - Steep slope
UR - http://www.scopus.com/inward/record.url?scp=84977740887&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84977740887&partnerID=8YFLogxK
U2 - 10.2480/agrmet.67.3.4
DO - 10.2480/agrmet.67.3.4
M3 - Article
AN - SCOPUS:84977740887
VL - 67
SP - 107
EP - 116
JO - J. AGRICULTURAL METEOROLOGY
JF - J. AGRICULTURAL METEOROLOGY
SN - 0021-8588
IS - 3
ER -