@InProceedings{DominguesPSMK:2002:AmFo,
               author = "Domingues, Margarete O. and Prasad, Gannabathula Sri Sesha Durga 
                         and S{\'a}, Leonardo Deane de Abreu and Randow and Celso and von 
                         and Manzi, Antonio ocimar and Kruijt, Bart",
                title = "Evidence of non-existence of a {"}spectral-gap{"} in turbulence 
                         data measured above Rondonia, Brazil. Part I: Amazonian Forest",
                 year = "2002",
         organization = "International LBA Scientific Conference, 2.",
             keywords = "METEOROLOGIA.",
             abstract = "Wavelet and Fourier analyses are used to identify the spectral 
                         characteristics of wind velocity (u, v, w components), 
                         temperature, humudity and CO2 concentration data sets, obtained 
                         during dry and wet seasons above Amazonian forest. The data were 
                         measured in August-September (dry-season)and in December 
                         (wet-season), year of 2000, as a part of the Brazil/European Union 
                         LBA Tower Consortium, in southwestern part of Amazonian region. 
                         Measurements are made at micrometeorological tower located in the 
                         Biological Reserve of Jaru (10o 04{\"{\i}} S, 61o 56{\"{\i}} 
                         W)above a 32 m height forest canopy. The fast response wind speed 
                         and temperature measurements, sampled at 10.42 Hz rate, were made 
                         using a three-dimensional sonic anemometer (Solent A1012R, Gill 
                         Instruments), at a height of 62.7 m. Analyses are performed over a 
                         wide frequency range, from the inertial subrange domain up to one 
                         day time-scale. Data are studied for a five day only spectrum and 
                         for one day mean spectra and cospectra. Results showed that is not 
                         possible to identify spectra gap in any of the investigated 
                         variables. This has important consequence in that separating the 
                         turbulence flow into mean and fluctuation components may not be 
                         valid. This also makes it difficult to determine a cutoff 
                         frequency for filtering the data. This absence of a spectral gap 
                         is probably due to the non-stationary characteristics of turbulent 
                         fields above Amazonian forest. Some physical phenomena in tropical 
                         meteorology are proposed to explain the findings.",
  conference-location = "Manaus, Br",
      conference-year = "7-10 July 2002",
                label = "10261",
           targetfile = "domingues.pdf",
        urlaccessdate = "20 maio 2024"
}