@InProceedings{SaatchiAlvaScot:2004:MeVeAe,
               author = "Saatchi, Sassan S. and Alvala, Regina Celia dos Santos and Scott, 
                         A. Denning",
          affiliation = "{CPTEC-INPE-Cachoeira Paulista-12630-000-SP-Brasil}",
                title = "Measuring Vegetation Aerodynamic Roughness Over the Amazon Basin",
            booktitle = "Anais...",
                 year = "2004",
         organization = "Conferencia Cientifica do LBA, 3.",
             abstract = "The aerodynamic roughness length (Z0) is an important parameter to 
                         determine the vertical gradients of mean wind speed and the 
                         conditions for momentum transfer over a vegetated or bare rough 
                         surface. Over vegetated surfaces, the aerodynamic roughness length 
                         has a simple one-to-one relationship with the rms height of the 
                         vegetation at the top of the canopy. Once this roughness length is 
                         determined for a surface, it does not change with wind speed, 
                         stability or stress. During the LBA experiment the Regional 
                         Atmospheric Modeling System (RAMS) with flexible horizontal and 
                         vertical resolution will be used in conjunction with other models 
                         to simulate the atmospheric circulation and trace gas 
                         concentration and transport at various scales. This model is 
                         suitable to determine the effect of surface roughness parameter at 
                         trace gas transport both at local level for LBA study areas and on 
                         at the regional level for the entire Amazon basin. In this paper, 
                         we present the estimation of this parameter from data fusion of 
                         several remote sensing and ground data. SRTM (Shuttle Radar 
                         Topography Mission) data at 3 arc-sec resolution, texture maps 
                         derived from JERS-1 L-band radar system, vegetation cover types 
                         are the main spatial data sets used in data fusion. A 
                         semi-empirical algorithm relating these surface parameters to the 
                         rms height of the vegetation and the aerodynamic roughness was 
                         developed. This algorithm was applied to the entire SRTM data to 
                         estimate the roughness length over the basin at 1 km resolution.",
  conference-location = "Brasilia",
      conference-year = "27-29 jul.",
             language = "en",
         organisation = "LBA",
           targetfile = "Saatchi_LBA.pdf",
        urlaccessdate = "01 maio 2024"
}