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Global Spectral UV‐Radiometer with Automatic Shadow Band
Author(s) -
Rosales Alejandro,
Pedroni Jorge V.,
Tocho Jorge O.
Publication year - 2006
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1562/2005-10-18-ra-720
Subject(s) - radiometer , total ozone mapping spectrometer , remote sensing , environmental science , irradiance , satellite , root mean square , calibration , radiation , sky , physics , spectrometer , ozone , optics , meteorology , ozone layer , geology , astronomy , quantum mechanics
ABSTRACT A solar radiometer (GUV‐511 C, Biospherical Instruments Inc., San Diego, CA) with four UV channels has been operating at Trelew (43.2°S, 65.3°W), Argentina, since the austral spring of 1997. The Instrument provides global (direct + diffuse) irradiance on the horizontal plane year‐round, with a 1 min period. On 1 January 1999, an automatic shadow band was added to calculate diffuse and direct radiation. The period of the measurements was increased to 2 min to keep the same signal to noise (S:N) ratio. Once the direct radiation values were available for the 305 nm and 320 nm spectral bands, the total ozone value was calculated and results were compared with data provided by the U.S. National Aeronautics and Space Administration for the Total Ozone Mapping Spectrometer (TOMS) on the Earth Probe satellite. Results show a root‐mean‐square (RMS) deviation within 4% compared with that of TOMS, so the quality of results is considered to be quite good. The importance of regular calibration to maintain long‐term accuracy is stressed.