Journal
INTERNATIONAL JOURNAL OF BIOMETEOROLOGY
Volume 56, Issue 2, Pages 411-418Publisher
SPRINGER
DOI: 10.1007/s00484-011-0445-2
Keywords
Albedo; Roughness length; Canopy structural parameter
Funding
- JSPS [22119009, 19106008]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Grants-in-Aid for Scientific Research [19106008, 22119009, 22310005, 09F09289] Funding Source: KAKEN
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Surface albedo (alpha) 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 alpha and z (0); however, no field data have been reported to quantify their relationships. Here, we hypothesize that a functional relationship between alpha 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 alpha 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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