Abstract
Abstract. This paper compares total ozone measurements from five Brewer spectroradiometers located at the Iberian Peninsula with satellite observations given by the GOME (Global Ozone Monitoring Experiment) sensor. The analyzed period covers simultaneous ozone values from July 1995 until December 2004. The regression analysis shows an excellent agreement between Brewer-GOME values in the five locations; the coefficient of correlation is always higher than 0.92 and the root mean square error is about 3%. Moreover, the comparison shows that the satellite retrieval accuracy is within the uncertainty of current ground-based instruments. In addition, the effects of several variables, such as cloudiness, solar zenith angle (SZA), effective temperature and total ozone values in Brewer-GOME differences are analyzed. The results indicate that clouds induce a minor dependence of GOME values on the SZA. For example, during heavy cloudy conditions in Madrid station, GOME observations overestimate ground-based Brewer data for low AMF (low SZA values) by 2% while for high AMF (high SZA values) the satellite underestimates ground-based ozone values by 1%. Moreover, the dependence of Brewer-GOME differences with respect to SZA for cloud-free conditions may be due to the variability of effective temperature. This fact could indicate that the effective temperature estimated by GOME does not fully reflect the actual atmospheric temperature variability. Finally, GOME ozone observations slightly underestimate the highest values measured by the Brewer spectrophotometers and overestimates the lowest ground-based measurements.
Highlights
Satellite monitoring of the Earth’s atmosphere allows one to globally record spatial and temporal information on different physical parameters
To further analyse the differences between the Global Ozone Monitoring Experiment (GOME) and Brewer observations, we examined the temporal evolution of the differences and the dependence on cloudiness, solar zenith angle (SZA), effective temperature and total ozone amount
Some important conclusions may be drawn from the GOMEBrewer comparison over five locations in the Iberian Peninsula
Summary
Satellite monitoring of the Earth’s atmosphere allows one to globally record spatial and temporal information on different physical parameters. This information is required for different applications, such as climate change, numerical weather prediction and pollution monitoring. One particular area where satellite monitoring has proven to be useful is in analysing global atmospheric ozone. Accurate ozone observations from remote sensing instruments play an important role in ozone trend analysis in order to assess current and future changes in the atmosphere. GOME has proven suitable for the generation of longterm data sets of trace atmospheric constituents; a series to be extended with GOME-2, launched in October 2006, on board METOP-1
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
