author = "Correa, Marcelo de Paula and Coronel, Genaro and Ceballos, Juan C. 
                         and Bottino, Marcus J.",
          affiliation = "{CPTEC-INPE-Cachoeira Paulista-12630-000-SP-Brasil}",
                title = "Comparative study of UVB attenuation observerd during dry and wet 
                         seasons in a South American region",
                 year = "2004",
         organization = "International Radiation Symposium, (IRS).",
             keywords = "ultraviolet index, clouds, satellite, radiative transfer.",
             abstract = "This work shows a comparative study about UVB attenuation over a 
                         South American region, during wet season (with low aerosol loads 
                         and cloudy days) and dry season (with biomass burning aerosol 
                         predominance in clear-sky days). The analysis was based on UVB 
                         data collected in Asunci{\'o}n city (Paraguay) between 2000 and 
                         2002, and theoretical clear-sky irradiances calculated by an UV 
                         multiple-scattering radiative transfer code. For the wet season - 
                         February/April - a clustering method applied to GOES-8 imagery 
                         allows for identification of different types of clouds. On the 
                         other hand, the presence of aerosols during the dry season - 
                         August/September - was evaluated using TOMS aerosol index 
                         estimates. The goals of this study are: a.) characteristics of UVB 
                         attenuation in both seasons; and b.) preliminary assessment of 
                         empirical patterns relating UVB fluxes and cloudiness and aerosol 
                         presence in the region.",
  conference-location = "Pusan, South Korea,",
      conference-year = "23-28 aug.",
             language = "en",
        urlaccessdate = "19 jan. 2021"