Abstract
Abstract. This article focuses on the comparison of the total ozone column data from three satellite instruments; Total Ozone Mapping Spectrometers (TOMS) on board the Earth Probe (EP), Ozone Monitoring Instrument (OMI) on board AURA and Global Ozone Monitoring Experiment (GOME) on board ERS/2, with ground-based measurement recorded by a well calibrated Brewer spectrophotometer located in Madrid during the period 1996–2008. A cluster classification based on solar radiation (global, direct and diffuse), cloudiness and aerosol index allow selecting hazy, cloudy, very cloudy and clear days. Thus, the differences between Brewer and satellite total ozone data for each cluster have been analyzed. The accuracy of EP-TOMS total ozone data is affected by moderate cloudiness, showing a mean absolute bias error (MABE) of 2.0%. In addition, the turbidity also has a significant influence on EP-TOMS total ozone data with a MABE ~1.6%. Those data are in contrast with clear days with MABE ~1.2%. The total ozone data derived from the OMI instrument show clear bias at clear and hazy days with small uncertainties (~0.8%). Finally, the total ozone observations obtained with the GOME instrument show a very smooth dependence with respect to clouds and turbidity, showing a robust retrieval algorithm over these conditions.
Highlights
Satellites provide a global view of the Earth’s atmospheric system over extended periods of time, with an appreciable spatial resolution allowing the systematic monitoring of the ozone layer
The main objective of this paper is to compare the TOC data provided by three satellite instruments: Total Ozone Mapping Spectrometers (TOMS), Ozone Monitoring Instrument (OMI) and Global Ozone Monitoring Experiment (GOME), with temporally collocated ground-based measurements from the Brewer spectrophotometer 070 located in Madrid
It can be seen that the Brewer and Earth Probe (EP)-TOMS data show a different behaviour under the various atmospheric circumstances sampled
Summary
Satellites provide a global view of the Earth’s atmospheric system over extended periods of time, with an appreciable spatial resolution allowing the systematic monitoring of the ozone layer. The instruments on board satellites need a continuous validation by well-calibrated and well-maintained ground-based instruments in order to assess the quality and accuracy of satellite data and to clarify local to regional specific sources of uncertainties. In this sense, the Brewer and Dobson spectrophotometers are generally considered as the standard reference for the remote sensing of the vertically integrated ozone amount (named total ozone column, hereafter denoted as TOC) from the Earth’s surface (WMO, 1996). It is known that the clouds are a great obstacle for a precise determination of ozone concentrations from satellite instruments
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