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Ann. Geophys., 24, 3215-3228, 2006
www.ann-geophys.net/24/3215/2006/
© European Geosciences Union 2006
Monitoring of UV spectral irradiance at Thessaloniki (1990–2005): data re-evaluation and quality control
K. Garane, A. F. Bais, S. Kazadzis, A. Kazantzidis, and C. Meleti
Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
Abstract. We present a re-evaluation and quality control of spectral ultraviolet
irradiance measurements from two Brewer spectroradiometers operating
regularly at Thessaloniki, Greece. The calibration history of the two
instruments was re-examined and data flaws were identified by comparing
quasi synchronous measurements. Analysis of the sensitivity of both
instruments to variations of their internal temperature revealed that they
have temperature coefficients of different sign. These coefficients exhibit
small variability during the 15-year period. Using averaged temperature
coefficients, we corrected both datasets. Corrections were applied for the
angular response error using two different approaches depending on the
availability of required ancillary data. The uncertainties associated with
the measurements have been estimated and presented. Finally, the two
datasets are compared using ratios of irradiance integrals at various bands
in the UV, in order to assess any dependencies on the internal instrument
temperature, solar zenith angle and wavelength.
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