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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Acknowledgements
We would like to thank anonymous reviewers, whose comments were useful for revising this manuscript. This work was supported by JSPS KAKENHI, Grants-in-Aid for Scientific Research on Innovative Areas (22119009) and (S)(19106008), and Innovative program of climate change projection for the 21st Century from The Ministry of Education, Culture, Sports, Science and Technology (MEXT).
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Cho, J., Miyazaki, S., Yeh, P.JF. et al. Testing the hypothesis on the relationship between aerodynamic roughness length and albedo using vegetation structure parameters. Int J Biometeorol 56, 411–418 (2012). https://doi.org/10.1007/s00484-011-0445-2
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DOI: https://doi.org/10.1007/s00484-011-0445-2