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- Title
Testing the hypothesis on the relationship between aerodynamic roughness length and albedo using vegetation structure parameters.
- Authors
Cho, Jaeil; Miyazaki, Shin; Yeh, Pat; Kim, Wonsik; Kanae, Shinjiro; Oki, Taikan
- Abstract
Surface albedo ( α) and aerodynamic roughness length ( z), 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; however, no field data have been reported to quantify their relationships. Here, we hypothesize that a functional relationship between α and z 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) was found, which is related to the canopy structural parameter. We believe that our finding is a big step toward the estimation of z with high accuracy. This can be used, for example, in the parameterization of land properties and the observation of z using satellite remote sensing.
- Subjects
ALBEDO; BIOSPHERE; PLANT canopies; VEGETATION management; AERODYNAMICS; REMOTE sensing
- Publication
International Journal of Biometeorology, 2012, Vol 56, Issue 2, p411
- ISSN
0020-7128
- Publication type
Article
- DOI
10.1007/s00484-011-0445-2