Editorial Type:
Article
Article Type:
Research Article

Radiative Transfer in the IAGL Land Surface Model

Koen De Ridder Institut d’Astronomie et de Gé(hysique Georges Lemaître, Université Catholique de Louvain, Louvain-la-Neuve, Belgium

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Print Publication:
01 Jan 1997
DOI:
https://doi.org/10.1175/1520-0450(1997)036<0012:RTITIL>2.0.CO;2
Page(s):
12–21
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Abstract

The radiation subscheme of a land surface model is presented. It is based on the two-stream approximation and includes explicit calculations for the scattering coefficients of direct and diffuse radiation. It applies to horizontally homogenous vegetation canopies, for both solar and thermal infrared radiation. Leaf orientation is accounted for by a leaf inclination index. An intercomparison with field data indicates that, when using general vegetation type–dependent parameters, the radiation scheme has an absolute accuracy on the order of a few percent for the amount of radiation absorbed by the surface and up to 10% as far as the partitioning between soil and vegetation is concerned. Finally, the radiation scheme is used in order to derive a method to calculate an effective leaf area index for transpiration that is physically based and consistent with observations.

Corresponding author address: Koen De Ridder, Institut d’Astronomie et de Gé(hysique Georges Lemaître, Université Catholique de Louvain, 2, Chemin du Cyclotron, B-1348 Louvain-la-Neuve, Belgium.

Abstract

The radiation subscheme of a land surface model is presented. It is based on the two-stream approximation and includes explicit calculations for the scattering coefficients of direct and diffuse radiation. It applies to horizontally homogenous vegetation canopies, for both solar and thermal infrared radiation. Leaf orientation is accounted for by a leaf inclination index. An intercomparison with field data indicates that, when using general vegetation type–dependent parameters, the radiation scheme has an absolute accuracy on the order of a few percent for the amount of radiation absorbed by the surface and up to 10% as far as the partitioning between soil and vegetation is concerned. Finally, the radiation scheme is used in order to derive a method to calculate an effective leaf area index for transpiration that is physically based and consistent with observations.

Corresponding author address: Koen De Ridder, Institut d’Astronomie et de Gé(hysique Georges Lemaître, Université Catholique de Louvain, 2, Chemin du Cyclotron, B-1348 Louvain-la-Neuve, Belgium.

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Cover Journal of Applied Meteorology and Climatology
Journal of Applied Meteorology and Climatology

  • André, J. C., J. P. Goutorbe, and A. Perrier, 1986: HAPEX-MOBILHY: A hydrological and atmospheric experiment for the study of water budget and evaporation flux at the climatic scale. Bull. Amer. Meteor. Soc.,67, 138–144.

  • Bornstein, R., P. Thunis, P. Grossi, and G. Schayes, 1996: Topographic vorticity-mode mesoscale-β (TVM) model. Part II: Evaluation. J. Appl. Meteor.,35, 1824–1834.

  • De Ridder, K., and G. Schayes, 1997: The IAGL land surface model. J. Appl. Meteor., in press.

  • Dickinson, R. E., 1983: Land surface processes and climate—Surface albedos and energy balance. Advances in Geophysics, Vol. 25, Academic Press, 305–353.

  • Dorman, J. L., and P. J. Sellers, 1989: A global climatology of albedo, roughness length, and stomatal resistance for atmospheric general circulation models as represented by the Simple Biosphere Model (SiB). J. Appl. Meteor.,28, 833–855.

  • Gallée, H., 1995: Simulation of the mesocyclonic activity in the Ross Sea, Antarctica. Mon. Wea. Rev.,123, 2051–2069.

  • ——, and G. Schayes, 1994: Development of a three-dimensional mesogamma primitive equations model, katabatic winds simulation in the area of Terra Nova Bay, Antarctica. Mon. Wea. Rev.,122, 671–685.

  • Iqbal, M., 1983: An Introduction to Solar Radiation. Academic Press, 390 pp.

  • Mahfouf, J. F., 1990: A numerical simulation of the surface water budget during HAPEX-MOBILHY. Bound.-Layer Meteor.,53, 201–222.

  • Monteith, J. L., and M. H. Unsworth, 1990: Principles of Environmental Physics. Edward Arnold, 291 pp.

  • Norman, J. M., and P. G. Jarvis, 1975: Photosynthesis in Sitka spruce. Radiation penetration theory and a test case. J. Appl. Ecol.,12, 839–878.

  • Pinty, B., M. M. Verstraete, and R. E. Dickinson, 1990: A physical model of the bidirectional reflectance of vegetation canopies 2. Inversion and validation. J. Geophys. Res.,95, 11 767–11 775.

  • Rauner, J. L., 1976: Deciduous forests. Vegetation and the Atmosphere, Vol. 2, J. L. Monteith, Ed., Academic Press, 241–264.

  • Ross, J., 1975: Radiative transfer in plant communities. Vegetation and the Atmosphere, Vol. 1, J. L. Monteith, Ed., Academic Press, 13–55.

  • ——, 1981: The Radiation Regime and Architecture of Plant Stands. W. Junk, 391 pp.

  • Schayes, G., P. Thunis, and R. Bornstein, 1996: Topographic voticity-mode mesoscale-β (TVM) model. Part I: Formulation. J. Appl. Meteor.,35, 1815–1823.

  • Shawcroft, R. W., and E. R. Lemon, 1973: Estimation of internal crop water status from meteorological and plant parameters. Plant Response to Climatic Factors, R. O. Slatyer, Ed., UNESCO, 449–559.

  • Spiegel, M. R., 1968: Mathematical Handbook of Formulas and Tables. McGraw-Hill, 271 pp.

  • Tanré, D., C. Deroo, P. Duhaut, M. Herman, J.-J. Morcrette, J. Perbos, and P. Y. Deschamps, 1990: Description of a computer code to simulate the satellite signal in the solar spectrum. Int. J. Remote Sens.,11, 659–668.

  • Uchijima, Z., 1976: Maize and rice. Vegetation and the Atmosphere, Vol. 2, J. L. Monteith, Ed., Academic Press, 33–64.

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