Testing the hypothesis on the relationship between aerodynamic roughness length and albedo using vegetation structure parameters |
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Authors: | Cho Jaeil Miyazaki Shin Yeh Pat J-F Kim Wonsik Kanae Shinjiro Oki Taikan |
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Institution: | (1) Kasuya Research Forest, Kyushu University, Sasaguri Fukuoka, 811–2415, Japan;(2) Graduate School of Environmental Science, Hokkaido University, N10W5, Sapporo 060–0810, Japan;(3) Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku Tokyo, 153–8505, Japan;(4) National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba Ibaraki, 305–8604, Japan;(5) Department of Mechanical and Environmental Informatics, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku Tokyo, 152–8552, Japan |
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Abstract: | Surface albedo (α) and aerodynamic roughness length (z
0), which partition surface net radiation into energy fluxes, are critical land surface properties for biosphere–atmosphere
interactions and climate variability. Previous studies suggested that canopy structure parameters influence both α and z
0; however, no field data have been reported to quantify their relationships. Here, we hypothesize that a functional relationship
between α and z
0
exists for a vegetated surface, since both land surface parameters can be conceptually related to the characteristics of
canopy structure. We test this hypothesis by using the observed data collected from 50 site-years of field measurements from
sites worldwide covering various vegetated surfaces. On the basis of these data, a negative linear relationship between α and log(z
0) was found, which is related to the canopy structural parameter. We believe that our finding is a big step toward the estimation
of z
0 with high accuracy. This can be used, for example, in the parameterization of land properties and the observation of z
0 using satellite remote sensing. |
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Keywords: | |
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