%0 Conference Proceedings
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%3 IRS 2008 abstract Pabulo H. Rampelotto Observational data analysis between ..pdf
%B International Radiation Symposium (IRS2008),
%X Several uncertainties are involved in the measurement of UV radiation. Spectral UV irradiances are generally measured by different and independent instruments with various output formats and specific standard calibrations, which difficult an irrefutable conclusion about the real magnitude of UV measurements. One of the most applied instruments in the monitoring of spectral UV irradiance has been the Brewer spectrophotometer. The Brewer MKIII is designed to measure the solar spectral irradiances in the region from 286.5 nm to 363 nm with a spectral resolution of 0.5 nm. However, rapidly changing conditions like the variability in cloud, dynamic of the lower atmosphere, are significant interference sources for instruments with a relatively long period of measurement for each wavelength channel, such as for the Brewer spectrophotometers. For this instrument, one scan takes 30 minutes. Another important spectral instrument is the Spectroradiometer MS 701, which takes a scan at each minute in the spectral region from 300 nm to 400 nm with a resolution of 0.7 nm. In this work, measurements from a Brewer MK III and a Spectroradiometer MS 701 at 305 nm were analyzed for clear and cloudy skies in order to investigate their coherence. The 305 nm is the most important wavelength for biological studies and has significant influence from the sky condition. Both instruments are installed and are in operation at the INPEs Southern Space Observatory (29°S, 53°W), South of Brazil. The results shows a very good coherence between the Brewer MK III and Spectroradiometer MS 701 data for clear skies, considering the mean variation of only 4% between the observed measurements. The higher variability is observed from 14:00 to 19:00 GMT time. Spectral distortions due to rapid environmental changing conditions (i.e. on the occasion of clouds crossing during the time of measurement) were not observed by the Brewer spectrophotometer as results of its scanning long time. For cloud days the presence of natural interferences can be very good visualized by the spectroradiometer and making easy the UV monitoring.
%T Observational data analysis between a Spectroradiometer MS701 with a Brewer Spectrophotometer MKIII for clear and cloudy sky conditions
%@secondarytype PRE CI
%8 3-8 Agosto
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%@group RSU-CIE-INPE-MCT-BR
%@group RSU-CIE-INPE-MCT-BR
%@group RSU-CIE-INPE-MCT-BR
%@secondarykey INPE--PRE/
%2 sid.inpe.br/mtc-m18@80/2008/12.04.15.18.11
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%P 107
%4 sid.inpe.br/mtc-m18@80/2008/12.04.15.18
%D 2008
%S Abstracts
%A Rampelotto, Pabulo Henrique,
%A Rosa, Marcelo Barcellos da,
%A Schuch, Nelson Jorge,
%C Foz do Iguaçu, Argentina
%@area CEA