@InProceedings{TarasovaNobr:1998:SeVaSu,
               author = "Tarasova, Tatiana and Nobre, Carlos Afonso",
          affiliation = "{CPTEC-INPE-Cachoeira Paulista-12630-000-SP-Brasil}",
                title = "Seasonal variations of surface solar irradiances under clear-skies 
                         and cloud cover obtained from long-term solar radiation 
                         measurements in the Rondonia region of Brazil",
            booktitle = "Anais...",
                 year = "1998",
         organization = "Congresso Brasileiro de Meteorologia, 10.",
             abstract = "Atmospheric transmission of the incident solar flux, that is the 
                         ratio of the solar irradiances measured at the surface and 
                         calculated at the top of the atmosphere, was computed at two 
                         observational sites in the Rondonia region of Brazil. In order to 
                         study the causes of the seasonal variations of the atmospheric 
                         transmission, we assessed the water vapor, aerosol and cloudiness 
                         effects on the solar radiation attenuation in the atmosphere. For 
                         this purpose, the surface solar irradiance and atmospheric 
                         transmission was computed at one of the sites for gaseous and 
                         gaseous-aerosol cloudless atmospheres employing a broad band 
                         radiation code and both aerosol optical depth and precipitable 
                         water retrieved from sun photometer measurements. Then, the effect 
                         of cloudiness was estimated by calculating the ratio of the 
                         surface solar irradiances, measured under cloudy conditions and 
                         computed for the clear-sky atmosphere. It was shown that the 
                         values of solar radiation attenuation in the atmosphere by water 
                         vapor and cloudiness are comparable during the wet season, while 
                         the aerosol effect is small. In the dry season, the cloudiness 
                         impact on the solar radiation attenuation considerably decreases, 
                         while the effect of the smoke aerosols increases.",
  conference-location = "Brasilia",
      conference-year = "26-30 out. 1998",
           copyholder = "SID/SCD",
             language = "en",
         organisation = "SBMET",
           targetfile = "Tarasova_Seasonal variations of surface solar .pdf",
        urlaccessdate = "28 abr. 2024"
}