Observacao da radiacao ultravioleta solar tipo B em banda larga / Observations of broadband solar UV-B radiation

AUTOR(ES)

Ezequiel Echer

DATA DE PUBLICAÇÃO

1999

RESUMO

The National Institute for Space Research (INPE), operates a network of solar ultraviolet B (UV-B) radiation meters, at ground level, since the 1990 s, at sites in Brazil, Bolivia, Chile and Antarctica. The ultraviolet meters are broadband meters (UV-Biometer), and narrowband meters (Ground-based Ultraviolet Radiometers, Brewer Ozone Spectrophotometers). Several analyses of UV-B radiation are presented, with emphasys on a methodology derived from Langley s method to calculate the atmospheric total optical depth in the UV-B. This methodolgy was then applied to global radiation data measured by the Brewer spectrophotometer. The total optical depths obtained with global radiation were compared with total optical depths obtained with direct radiation data, also measured by the Brewer spectrophotometer, with good match. The methodology to calculate optical depths was then tested also for UV-Biometer data, although these do not follow the Langley requirements. The results obtained with UV-Biometer data for total optical depth were in good agreement with optical depths calculated from the Brewer data, at 310 and 320 nm.

ASSUNTO(S)

espessura optica atmosfera radiacao ultravioleta geofisica espacial ozonio

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