Testing the hypothesis on the relationship between aerodynamic roughness length and albedo using vegetation structure parameters

Jaeil Cho, Shin Miyazaki, Pat J.F. Yeh, Wonsik Kim, Shinjiro Kanae, Taikan Oki

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14 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)411-418
Number of pages8
JournalInternational Journal of Biometeorology
Volume56
Issue number2
DOIs
Publication statusPublished - Mar 2012
Externally publishedYes

Keywords

  • Albedo
  • Canopy structural parameter
  • Roughness length

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