Comparison of three land-surface schemes with the Fourier amplitude sensitivity test (FAST)

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Rodríguez Camino, Ernesto ; Avissar, Roni (1998)
  • Publisher: Taylor & Francis
  • Journal: Tellus A (issn: 1600-0870, eissn: 0280-6495)
  • Related identifiers: doi: 10.3402/tellusa.v50i3.14529
  • Subject: Biosphere-atmosphere transfer scheme | Land-atmosphere interactive dynamics | Soil-biosphere-atmosphere | Land-surface parameters | Atmospheric modelling | Fourier amplitude sensitivity test

This paper explores which are the land-surface parameters playing a key rôle in three surfaceschemes, namely the land-atmosphere interactive dynamics (LAID), the interaction soil-biosphere-atmosphere (ISBA) and the biosphere-atmosphere transfer scheme (BATS). The Fourieramplitude sensitivity test (FAST) was used for that purpose. This test estimates the relativecontribution of model input parameters to the variance of surface heat fluxes. This analysisdemonstrates that, for the three considered schemes, four parameters can explain most of thevariance of surface heat fluxes under a broad range of environmental conditions. Soil wetnessplays a predominant rle for the heat fluxes. Roughness length is the most important parameterfor the momentum flux. Leaf area index, in vegetated land, and texture, mainly in bare land,also have a significant impact on the fluxes. Roughness length is usually more important forsensible heat flux than for latent heat flux, and is mostly important under stable atmosphericconditions. Soil wetness and vegetation parameters are the dominant parameters under buoyantconditions.DOI: 10.1034/j.1600-0870.1998.t01-2-00005.x
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