Articles | Volume 3, issue 3
Hydrol. Earth Syst. Sci., 3, 439–444, 1999
https://doi.org/10.5194/hess-3-439-1999
Hydrol. Earth Syst. Sci., 3, 439–444, 1999
https://doi.org/10.5194/hess-3-439-1999

  30 Sep 1999

30 Sep 1999

Research Note:The comparison of two models that determine the effects of a vegetation canopy on passive microwave emission

E. J. Burke1,*, J.-P. Wigneron2, and R. J. Gurney3 E. J. Burke et al.
  • 1Institute of Hydrology, Crowmarsh Gifford, Wallingford, Oxon, OX10 8BB, UK
  • 2INRA, Unite de bioclimatologie, Dormaine Saint Paul, Site Agroparc, 84914 Avignon Cedex 9, France
  • 3Environmental Systems Science Centre, University of Reading, Whiteknights, Reading, RG6 6AL, UK
  • *email for corresponding author: eleanor@hwr.arizona.edu.

Abstract. Two contrasting models are used to account for the effects of vegetation on microwave emission from the soil. These are: a simple model which requires two empirically derived parameters as input data (optical depth and single scattering albedo); and a complex discrete model which requires a detailed description of all of the components of the vegetation canopy. Both models account effectively for the vegetation, although the simple model takes a fraction of the computation time compared to the discrete model. However, the simple model was fitted to the data, whereas the discrete model used measured parameters as input. In addition to predicting the microwave brightness temperature, the discrete model also calculates the optical depth and single scattering albedo. These calculated values were in agreement with those fitted using the simple model. Therefore, it is suggested that the discrete model could be used to calculate the input parameters for the simple model.