A ‘Lagrangian’ revision of the resistors in the two-layer model for calculating the energy budget of a plant canopy View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1995-05

AUTHORS

K. G. McNaughton, B. J. J. M. Van Den Hurk

ABSTRACT

This paper completes the construction of a two-layer model for the energy balance of sparse canopies begun by Van den Hurk and McNaughton (1994). The model is based on the Lagrangian theory of Raupach (1989). In the earlier work, we showed that the average effect of the near-field component of the scalar concentration profile can be represented by a ‘near-field’ resistor. Here we calculate values for the upper and lower ‘far-field’ resistors using Raupach's expression for the far-field diffusivity and his empirical descriptions of the profiles of vertical velocity variance and Lagrangian integral time scale (Raupach, 1988). The boundary-layer resistance for the foliage of the overstorey canopy is also reassessed. Calculations are carried out for a range of possible canopies. Representative values are chosen for use where a detailed description of the vegetation is unavailable.The resistors of the new model are compared with those of earlier two-layer models. The new ‘far-field’ resistors are smaller than the corresponding ‘aerodynamic’ resistors of the earlier models of Shuttleworth and Wallace (1985) and Choudhury and Monteith (1988) while the new boundary-layer resistor can be somewhat larger, depending on the choices made in the calculation. We could not find experimental data on canopy energy balances suitable for deciding which model is best. Instead, we have attempted to verify the model using measurements of surface temperature and calculated values of the ‘excess’ resistance, but the results are not definitive. A major conclusion is that turbulent transport near the ground beneath an overstorey canopy is poorly known and therefore is poorly represented in all models. Another conclusion is that current models for the excess resistance are inadequate. More... »

PAGES

261-288

References to SciGraph publications

  • 1984-03. Uncoupled multi-layer model for the transfer of sensible and latent heat flux densities from vegetation in BOUNDARY-LAYER METEOROLOGY
  • 1986-07. Radiative surface temperature and energy balance of a wheat canopy in BOUNDARY-LAYER METEOROLOGY
  • 1992-09. Drag and drag partition on rough surfaces in BOUNDARY-LAYER METEOROLOGY
  • 1988. Canopy Transport Processes in FLOW AND TRANSPORT IN THE NATURAL ENVIRONMENT: ADVANCES AND APPLICATIONS
  • 1972-12. A wind-profile index for canopy flow in BOUNDARY-LAYER METEOROLOGY
  • 1988-12. Boundary-layer resistances of artificial leaves in turbulent air II: Leaves inclined to the mean flow in BOUNDARY-LAYER METEOROLOGY
  • 1988-10. Boundary-layer resistances of artificial leaves in turbulent air: I. Leaves parallel to the mean flow in BOUNDARY-LAYER METEOROLOGY
  • 1985. Flux-Gradient Relationships in a Forest Canopy in THE FOREST-ATMOSPHERE INTERACTION
  • 1978-08. Analysis of canopy index values for various canopy densities in BOUNDARY-LAYER METEOROLOGY
  • 1986-07. Radiative surface temperature and energy balance of a wheat canopy in BOUNDARY-LAYER METEOROLOGY
  • Identifiers

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    http://scigraph.springernature.com/pub.10.1007/bf00712121

    DOI

    http://dx.doi.org/10.1007/bf00712121

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1014446515


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