Measurements of total ozone amount over Badajoz (Southwestern Spain) by means of a GUV multiband radiometer
2012
This paper presents the first measurements of total ozone amount performed at the radiometric
station of Badajoz (Spain) by means of a multichannel radiometer GUV-2511. The retrieval of total
ozone amount from GUV measurements of solar ultraviolet irradiance is performed with the support
of look-up tables calculated using the SBDART radiation transfer code. This methodology is based on
the different absorption by ozone suffered by the radiation at two certain near wavelengths. In this
case the pair 305, 340 nm was chosen because of its better performance than the pair 305, 320 nm.
The look-up table contains the ratio between irradiances at the mentioned wavelengths calculated
under different theoretical conditions of solar zenith angle and total ozone amount. The estimations
of actual total ozone amount are calculated applying the look-up table to the experimental irradiance
ratios as measured by the GUV radiometer. In order to validate these estimations, they are compared
with the values provided by the OMI (Ozone Monitoring Instrument) aboard NASA EOS/Aura
satellite during April 2010. Results indicate a general good agreement between both datasets,
showing a notable dependence with the cloudiness conditions.
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